Fast by default
Heavy editors and processors load only on the routes that need them.
200+ privacy-first tools200 live nowNo backend requiredMost workflows stay local
Free online tools for developers, SEO, images, text, and everyday work
ToolkitPropp helps you format code, inspect files, generate SEO assets, edit images, and solve technical calculations directly in the browser. Privacy-first workflows, no account walls, and no unnecessary uploads.
Works in Chrome, Firefox, Safari, Edge. Browse all categories, open the embedded tools directory, or inspect sitemap.xml.
Privacy-first
Sensitive text, files, and calculations stay in your browser whenever possible.
SEO-ready
Category pages, sitemaps, schema markup, canonicals, and dynamic Open Graph images are built in.
Security & Encoding
Hash, encrypt, compare, and decode sensitive values entirely in your browser.
AES Encrypt/Decrypt
Encrypt and decrypt text with AES-GCM using the Web Crypto API.
Base64 Encode/Decode
Encode and decode text to and from Base64 format instantly.
Bcrypt Compare Tool
Compare a plaintext password against a bcrypt hash locally.
Bcrypt Generator
Generate bcrypt password hashes and compare passwords against hashes.
Hash Compare
Compare computed hashes against stored values across common algorithms.
JWT Decoder
Decode and inspect JSON Web Tokens to view header and payload.
Developer Tools
Format code, convert data structures, and clean up messy developer input.
Base64 Image Encoder
Convert uploaded images directly into Base64 strings.
Class Diagram Maker
Draft Mermaid-compatible UML class diagrams with a browser-based editor and board preview.
Cron Expression Parser
Validate cron schedules and preview upcoming run times.
CSS Minifier/Formatter
Minify or beautify CSS code for optimization.
CSV to JSON Converter
Convert CSV data to JSON and vice versa with ease.
Data URI Generator
Generate inline data URIs from uploaded files and text assets.
Text & Content
Transform, analyze, compare, and generate text for writing and research workflows.
Alias Generator
Create usernames, pet names, and brand-style aliases instantly.
Binary/Text Converter
Convert plain text into binary and decode binary back to text.
Case Converter
Convert text between upper, lower, title, camel, and other casing styles.
Diff Checker
Compare two blocks of text and highlight additions and removals.
Leet Speak Converter
Turn text into 1337-style writing with adjustable intensity.
Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences, or words.
Image Tools
Crop, rotate, watermark, inspect, and export images without uploads.
Background Remover
Remove image backgrounds in the browser with color picking, flood fill, and edge-aware controls.
Change Background
Replace image backgrounds with a solid color, gradient, or uploaded image using browser-based compositing.
Color Picker
Pick colors and convert between HEX, RGB, and HSL formats.
EXIF GPS Remover
Check image metadata for location, device, and timestamp details, then strip the fields you do not want to share. It is especially useful for press kits, listings, and personal photos shared publicly.
Favicon Generator
Generate favicon assets from an uploaded source image.
Image Batch Converter
Convert multiple images to JPG, PNG, or WebP and download them together.
Design & UI
Build gradients, filters, shadows, motion, and CSS snippets with live previews.
Aspect Ratio Layout Calculator
Calculate reduced ratios, responsive CSS, and padding tricks from any frame size.
Border Radius Generator
Generate CSS border-radius values for custom shapes.
Box Shadow Generator
Create CSS box shadows with a visual editor.
CSS Filter Generator
Adjust blur, brightness, contrast, hue, and more with live CSS output.
CSS Gradient Generator
Create linear and radial gradients with multiple stops.
CSS Grid Template Generator
Build responsive CSS Grid layouts visually with named areas, repeat helpers, and breakpoint previews. Designers and frontend teams can test layouts quickly before writing production CSS.
SEO & Web
Generate tags, inspect page data, and analyze content for search visibility.
Broken Link Checker
Check a list of URLs in the browser and mark timeout or fetch failures clearly.
Canonical Tag Generator
Create canonical link tags for pages, product variants, and paginated URLs.
DNS Lookup
Look up DNS records for any domain with resilient browser-safe handling.
Hreflang Tag Generator
Generate hreflang link tags for multilingual and multi-region sites.
Internal Link Graph Visualizer
Turn pasted URL and link-export data into a visual internal-link graph to spot orphaned pages, weak clusters, and overlinked nodes. It helps SEO teams plan site structure without sending crawl exports to an outside tool.
IP Address Lookup
Find your IP address and location information with client-side fallbacks.
Calculators & Converters
Everyday calculators for finance, health, dates, units, and quick conversions.
Age Calculator
Calculate age precisely from a birth date with years, months, and days.
BMI Calculator
Calculate body mass index from weight and height.
Compound Interest Calculator
Estimate future value and earned interest with annual compound growth.
Currency Converter
Convert currencies with browser fetch plus resilient offline fallback rates.
Date Difference Calculator
Measure the exact duration between two dates and times.
Discount Calculator
Work out discount savings and final totals after percentage reductions.
Random Generators
Generate names, quotes, colors, passwords, numbers, and playful creative data.
Coin Flip Simulator
Flip a virtual coin repeatedly and track heads-versus-tails results.
Pronounceable Password Generator
Generate strong password phrases built from pronounceable chunks.
Random Address Generator
Create plausible sample street addresses for demos and testing.
Random Avatar Generator
Create simple SVG identicon-style avatars from a seed.
Random Color Generator
Generate random HEX and RGB colors with instant swatches.
Random Credit Card Generator
Generate Luhn-valid test card numbers for sandbox environments.
Audio & Media
Record, visualize, and synthesize sound with lightweight browser-native tools.
Audio Recorder
Record microphone input and download the captured audio.
Audio Waveform Visualizer
Load an audio file and inspect its waveform in the browser.
Beat Interval Calculator
Convert BPM into beat, bar, and loop timing intervals in milliseconds.
BPM Tap Tempo & Delay Time Calculator
Tap a tempo or enter BPM to calculate note divisions, delay times, and loop-friendly timing values. It helps producers and musicians line up effects and timing without a DAW plugin.
Frequency to Note Converter
Convert audio frequencies to the nearest musical note and cents offset.
Metronome
Practice with a browser-based metronome and adjustable tempo.
File Tools
Inspect, split, merge, archive, and checksum files locally.
Base64 File Encoder
Encode uploaded files to Base64 strings in the browser without server uploads.
Checksum Calculator
Calculate CRC32, simulated MD5, and SHA-256 hashes for uploaded files.
File Merger
Merge multiple text files into one combined output with separators.
File Splitter
Split text files by line count or approximate chunk size.
Filename Sanitizer
Normalize messy file names for safer downloads, uploads, and archives.
Line Ending Converter
Convert text between LF and CRLF line endings for editor and repo consistency.
Accessibility
Audit navigation, labels, and UX details that improve keyboard and screen-reader support.
Accessibility Focus Order Visualizer
Map keyboard tab order, skip-link flow, and focus traps from pasted HTML so teams can catch navigation issues before shipping. The visual overlay makes a11y reviews faster for product, QA, and frontend teams.
Alt Text Length Checker
Review image alt text for length, clarity, duplication, and decorative-image handling. It helps content teams write accessible image descriptions without relying on AI or third-party APIs.
ARIA Label Reviewer
Review interactive elements for missing accessible names and weak ARIA labeling.
Color Contrast Checker
Check foreground and background color contrast against common WCAG thresholds.
Focusable Elements Checker
List focusable controls, tabindex order, and skip-link coverage from pasted markup.
Heading Structure Outline
Audit pasted HTML for heading order, skipped levels, and document outline clarity.
Data & Analytics
Inspect structured exports, logs, charts, and browser diagnostics without uploading files.
CSV Column Profiler
Profile CSV headers, fill rates, and likely column types from pasted data.
Data Size Estimator
Estimate dataset storage growth from row counts and average row sizes.
Generate Chart
Turn pasted CSV, JSON, or plain text into configurable charts and downloadable reports.
HAR File Viewer & API Timeline Analyzer
Open HAR exports locally and turn them into a sortable timeline for slow requests, waterfalls, headers, and payload sizes. It helps engineering and QA teams diagnose frontend performance without uploading logs.
Ping Test Tool
Test round-trip request latency to a public URL with browser-safe fetch timing and packet-loss estimates.
WiFi Speed Test
Measure same-origin download speed, upload speed, latency, and connection quality with browser-safe benchmarks.
Financial & Business
Model pricing, margin, billing, and break-even decisions with privacy-first calculators.
Break-Even Calculator
Calculate break-even units, target revenue, and contribution margin with interactive charts and scenario sliders. It gives founders, operators, and consultants a fast way to test pricing and cost assumptions privately.
Invoice Due Date & Late Fee Calculator
Calculate due dates, grace periods, and simple late-fee scenarios for invoices across common billing terms. It helps freelancers and small businesses stay organized without relying on online accounting portals.
Pricing Markup Calculator
Turn unit cost and target markup into a selling price and gross margin estimate.
Profit Margin Calculator
Calculate profit, markup, and margin from revenue and cost inputs instantly.
SaaS Pricing Margin Calculator
Model SaaS pricing tiers, gross margin, payback period, and annual recurring revenue from your own assumptions. It helps operators and growth teams reason about pricing without handing numbers to external calculators.
Sales Tax Calculator
Calculate tax-inclusive totals and tax amounts from any subtotal and rate.
Engineering & Technical
Solve practical electrical and technical calculations with visual references and unit-aware math.
Capacitor Charge Discharge Calculator
Estimate RC time constants and common charge thresholds for timing circuits.
LED Series Resistor Calculator
Calculate a safe resistor value and power rating for single-LED circuits.
Ohm’s Law & Power Triangle Calculator
Calculate voltage, current, resistance, power, and related electrical values with unit switching and visual formulas. It is ideal for students, technicians, and makers who need quick checks with clear explanations.
Power Supply Runtime Calculator
Estimate battery runtime from capacity and expected load current.
Resistor Color Code Calculator
Decode resistor bands visually, calculate tolerance, and switch between 4-band, 5-band, and 6-band modes. It helps electronics learners and hobbyists avoid common reading mistakes.
Voltage Divider Calculator
Calculate divided output voltage and resistor ratios for simple analog circuits.
Education & Learning
Visualize concepts, build study plans, and turn abstract topics into interactive practice.
Flashcard Randomizer
Shuffle flashcard prompts from a custom list for quick exam practice.
Fraction Simplifier Calculator
Reduce fractions to lowest terms and convert them to decimals and percentages.
Scientific Notation Converter
Convert numbers between expanded form and scientific notation instantly.
Study Session Planner
Build focused study blocks with short breaks and long-break intervals.
Unit Circle Visualizer
Explore angles, radians, coordinates, sine, cosine, and tangent with an interactive unit circle and labeled quadrants. It turns a memorization-heavy topic into a visual learning experience.
Astronomy & Space
Compare optics, sky-view calculations, and observational planning data in the browser.
Escape Velocity Calculator
Calculate escape velocity from planetary mass and radius estimates.
Moon Phase Finder
Estimate the moon phase and illumination for any calendar date.
Planet Weight Calculator
Compare your Earth weight against gravity on planets and the moon.
Telescope Field of View Calculator
Estimate telescope magnification, true field of view, and exit pupil using aperture, focal length, and eyepiece data. It helps astronomy hobbyists compare setups before a night of observing.
Telescope Magnification Comparator
Compare eyepiece magnification and field-of-view tradeoffs for one telescope setup.
Embedded tools and crawlable shortcuts
These direct links help browsers, users, and search engines discover ToolkitPro faster. Use the embedded HTML tools for iframe workflows, then move deeper into the full tool and category directories when you need more context.
Text Humanizer
Rewrite robotic text into more natural language inside an embeddable standalone page.
Chart Generator
Turn pasted CSV, JSON, or text into charts with an iframe-ready chart workspace.
Password Generator
Offer a browser-based password generator on any site with a direct embeddable URL.
QR Code Generator
Create QR codes for links, WiFi, and text with a shareable standalone page.
Text to Docs
Convert text into document-friendly output from a lightweight embeddable workflow.
Doc to PDF
Use a standalone document-to-PDF workflow that can be embedded directly on another site.
Text to PDF
Convert plain text into downloadable PDFs from a direct static embed route.
PDF to Word
Open the embeddable PDF-to-Word workflow through a direct standalone HTML page.
Background Remover
Remove image backgrounds in a static embeddable page built for client-side use.
Image Converter
Convert image formats with a standalone browser-based page that is ready to embed.
All 200 tools in one crawlable directory
Every tool page ships with a description, canonical URL, structured data, internal links, and category context so users and search engines can discover the right workflow faster. Use /categoriesfor topic-level browsing and /embedded-tools for standalone iframe-ready pages.
Security & Encoding (13)
Hash, encrypt, compare, and decode sensitive values entirely in your browser.
AES Encrypt/Decrypt
Encrypt and decrypt text with AES-GCM using the Web Crypto API.
Base64 Encode/Decode
Encode and decode text to and from Base64 format instantly.
Bcrypt Compare Tool
Compare a plaintext password against a bcrypt hash locally.
Bcrypt Generator
Generate bcrypt password hashes and compare passwords against hashes.
Hash Compare
Compare computed hashes against stored values across common algorithms.
JWT Decoder
Decode and inspect JSON Web Tokens to view header and payload.
JWT Signer
Create HS256 JWT tokens from a payload, headers, and secret.
MD5 Hash Generator
Generate MD5-style hash values from any text input.
Password Generator
Generate secure passwords with customizable length, numbers, and symbols.
Password Strength Checker
Score passwords for length, variety, and repetition risk without sending them anywhere.
QR Code Generator
Create QR codes for URLs, text, WiFi, and email with download options.
RSA Key Generator
Generate RSA-OAEP public and private keys in PEM format.
SHA-256 Hash Generator
Generate SHA-256 hash values with optional salt for enhanced security.
Developer Tools (26)
Format code, convert data structures, and clean up messy developer input.
Base64 Image Encoder
Convert uploaded images directly into Base64 strings.
Class Diagram Maker
Draft Mermaid-compatible UML class diagrams with a browser-based editor and board preview.
Cron Expression Parser
Validate cron schedules and preview upcoming run times.
CSS Minifier/Formatter
Minify or beautify CSS code for optimization.
CSV to JSON Converter
Convert CSV data to JSON and vice versa with ease.
Data URI Generator
Generate inline data URIs from uploaded files and text assets.
Environment Variables Parser
Parse `.env` style content into structured JSON and key/value tables.
ER Diagram Maker
Create entity-relationship diagrams with schema notes, Mermaid output, and a visual board summary.
Flowchart Maker
Build process diagrams and flowcharts from Mermaid-style syntax with export-friendly output.
HTML to Markdown Converter
Convert raw HTML into readable markdown syntax.
HTML/XML Escape
Convert special characters to and from HTML entities.
JavaScript Minifier/Formatter
Minify or beautify JavaScript code for production.
JSON Formatter & Validator
Format, validate, and minify JSON with error highlighting.
JSON Path Finder
Search nested JSON objects and return matching paths for keys and values.
JSON Schema Builder & Validator
Generate JSON Schema from sample payloads, validate example objects, and inspect required fields or type mismatches. It is useful when teams need portable contracts without spinning up a backend.
JSON to XML Converter
Transform JSON objects into formatted XML markup.
Markdown to HTML Converter
Render markdown into clean sanitized HTML with a live preview.
Pretty Log Formatter
Clean up JSON logs, key-value lines, and stack traces for readability.
Query String Parser
Parse URLs and query strings into readable key-value parameters instantly.
Regex Escape Helper
Escape plain text safely for regular-expression literals and search patterns.
Sequence Diagram Maker
Visualize API and system interactions with Mermaid-compatible sequence diagram editing.
SQL Formatter
Format and beautify SQL queries for better readability.
SQL to JSON Converter
Turn SQL INSERT statements into JSON data structures.
URL Encode/Decode
Encode and decode URLs with percent-encoding support.
XML Formatter & Validator
Pretty-print XML and flag malformed markup in your browser.
YAML to JSON Converter
Convert between YAML and JSON formats instantly.
Text & Content (20)
Transform, analyze, compare, and generate text for writing and research workflows.
Alias Generator
Create usernames, pet names, and brand-style aliases instantly.
Binary/Text Converter
Convert plain text into binary and decode binary back to text.
Case Converter
Convert text between upper, lower, title, camel, and other casing styles.
Diff Checker
Compare two blocks of text and highlight additions and removals.
Leet Speak Converter
Turn text into 1337-style writing with adjustable intensity.
Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences, or words.
Morse Code Converter
Encode text as Morse code and decode Morse back into text.
Nonsense Word Generator
Generate playful made-up words for naming and brainstorming.
Palindrome Checker
Check whether a word or phrase reads the same backwards.
PDF to Word Converter
Extract text from PDF and convert it into a Word document.
Random Text Generator
Generate placeholder copy in multiple lengths and writing tones.
Regex Tester
Test regular expressions with live match highlighting.
Text Humain
Detect robotic writing patterns and rewrite text into a more natural, human-sounding draft.
Text Reverser
Reverse text by characters, words, or full line order.
Text to PDF Converter
Convert plain text to PDF documents with customizable page size.
Text to Word Converter
Generate Word documents (.docx) from plain text.
Unicode Converter
Encode and decode unicode escape sequences and code points.
Word & Character Counter
Count words, characters, sentences, and estimate reading time.
Word Cloud Generator
Create a quick SVG word cloud from any text input.
Word to PDF Converter
Convert Word documents to PDF format.
Image Tools (19)
Crop, rotate, watermark, inspect, and export images without uploads.
Background Remover
Remove image backgrounds in the browser with color picking, flood fill, and edge-aware controls.
Change Background
Replace image backgrounds with a solid color, gradient, or uploaded image using browser-based compositing.
Color Picker
Pick colors and convert between HEX, RGB, and HSL formats.
EXIF GPS Remover
Check image metadata for location, device, and timestamp details, then strip the fields you do not want to share. It is especially useful for press kits, listings, and personal photos shared publicly.
Favicon Generator
Generate favicon assets from an uploaded source image.
Image Batch Converter
Convert multiple images to JPG, PNG, or WebP and download them together.
Image Compressor
Compress images with adjustable quality and preview.
Image Converter
Convert images between JPG, PNG, WebP, ICO, and AVIF formats.
Image Cropper
Crop images with common aspect ratios and download the result.
Image Flipper
Flip images horizontally or vertically and export the result.
Image Metadata Viewer
Read EXIF and basic image metadata from uploaded files.
Image Resizer
Resize images to preset or custom dimensions.
Image Rotator
Rotate images by presets or custom angles in the browser.
Image to Base64
Convert images to Base64-encoded strings with preview output.
Image Watermarker
Add a text watermark to images with positioning controls.
Remove Background
Remove plain or studio-style backgrounds from images and export a transparent PNG locally.
Resize Image
Resize images to exact pixels, percentages, or social presets while keeping aspect ratio in the browser.
Screenshot Capture
Capture a styled preview card as an image with html2canvas.
SVG Editor
Build simple SVG graphics with shapes, labels, and export-ready markup.
Design & UI (12)
Build gradients, filters, shadows, motion, and CSS snippets with live previews.
Aspect Ratio Layout Calculator
Calculate reduced ratios, responsive CSS, and padding tricks from any frame size.
Border Radius Generator
Generate CSS border-radius values for custom shapes.
Box Shadow Generator
Create CSS box shadows with a visual editor.
CSS Filter Generator
Adjust blur, brightness, contrast, hue, and more with live CSS output.
CSS Gradient Generator
Create linear and radial gradients with multiple stops.
CSS Grid Template Generator
Build responsive CSS Grid layouts visually with named areas, repeat helpers, and breakpoint previews. Designers and frontend teams can test layouts quickly before writing production CSS.
Keyframes Animator
Generate CSS `@keyframes` animations with timing controls and preview.
Spacing Scale Generator
Generate modular spacing scales for UI systems from a base size and ratio.
SVG Path Editor
Compose simple SVG paths and inspect their generated path commands.
SVG Sprite Sheet Generator
Combine multiple SVG icons into one optimized sprite sheet with symbol IDs, previews, and usage snippets. It makes icon systems easier to manage while keeping assets private and local.
Text Shadow Generator
Generate CSS text-shadow values with a live headline preview.
Transform Generator
Create translate, scale, rotate, and skew transform snippets visually.
SEO & Web (27)
Generate tags, inspect page data, and analyze content for search visibility.
Broken Link Checker
Check a list of URLs in the browser and mark timeout or fetch failures clearly.
Canonical Tag Generator
Create canonical link tags for pages, product variants, and paginated URLs.
DNS Lookup
Look up DNS records for any domain with resilient browser-safe handling.
Hreflang Tag Generator
Generate hreflang link tags for multilingual and multi-region sites.
Internal Link Graph Visualizer
Turn pasted URL and link-export data into a visual internal-link graph to spot orphaned pages, weak clusters, and overlinked nodes. It helps SEO teams plan site structure without sending crawl exports to an outside tool.
IP Address Lookup
Find your IP address and location information with client-side fallbacks.
Keyword Density Checker
Analyze repeated phrases and top keywords inside any text block.
Meta Description Length Checker
Review multiple meta descriptions for length and snippet-friendly ranges.
Meta Tags Generator
Generate SEO-friendly meta tags including Open Graph output.
Open Graph Preview Tool
Preview how Open Graph titles, descriptions, and images could appear socially.
Page Speed Insights Simulator
Estimate performance bottlenecks from page metrics with helpful guidance.
QR Code Reader
Read and decode QR codes from uploaded images.
Readability Score Calculator
Estimate Flesch-style readability and sentence complexity from text.
Redirect Chain Mapper
Visualize redirect chains from pasted crawl exports, response logs, or manually entered hops so teams can trim unnecessary redirects. This is useful during migrations, replatforms, and large-scale URL cleanup projects.
Robots.txt Generator
Create robots.txt files for your website.
Schema Markup Builder & Validator
Generate valid JSON-LD for articles, organizations, products, FAQs, and local businesses with instant preview and rule checks. It helps SEO teams ship structured data faster without copy-pasting uncertain snippets.
SEO Meta Tag Extractor
Inspect a pasted HTML document for title, description, canonical, and social tags.
SERP Snippet Preview
Preview title tags, URLs, and meta descriptions in a search-style snippet layout.
Sitemap Generator
Generate XML sitemaps from a list of URLs.
Sitemap Priority Planner
Assign sitemap priorities and change frequencies from a simple URL inventory.
Slug Optimizer
Turn page titles into clean, readable, SEO-friendly URL slugs.
SSL Checker
Check SSL certificate status for any domain with graceful fallbacks.
Twitter Card Validator
Validate key Twitter Card fields and preview card-style output locally.
User Agent Parser
Parse browser, operating system, and device details from user agent strings.
UTM Campaign Builder & Validator
Create consistent UTM URLs, validate naming conventions, and catch messy campaign tagging before links go live. It helps marketing teams keep analytics cleaner across channels and stakeholders.
UUID Generator
Generate UUIDs in bulk with instant copy and export support.
Website Color Palette Extractor
Extract a rough palette from pasted CSS or HTML color values.
Calculators & Converters (20)
Everyday calculators for finance, health, dates, units, and quick conversions.
Age Calculator
Calculate age precisely from a birth date with years, months, and days.
BMI Calculator
Calculate body mass index from weight and height.
Compound Interest Calculator
Estimate future value and earned interest with annual compound growth.
Currency Converter
Convert currencies with browser fetch plus resilient offline fallback rates.
Date Difference Calculator
Measure the exact duration between two dates and times.
Discount Calculator
Work out discount savings and final totals after percentage reductions.
Electricity Cost Calculator
Estimate monthly electricity cost from wattage, daily runtime, and energy price.
Fuel Cost Calculator
Estimate fuel needed and trip cost from distance, efficiency, and fuel price.
GPA Calculator
Estimate GPA from course grades and credit hours.
Loan Calculator
Estimate EMI payments, interest cost, and repayment totals.
Margin Calculator
Estimate gross margin percentage and profit from selling price and cost.
Markup Calculator
Calculate selling price and profit from cost and markup percentage.
Pace Calculator
Calculate pace per kilometer and average speed from distance and total time.
Percentage Calculator
Solve common percentage calculations instantly.
Percentage Change Calculator
Measure percentage increase or decrease between an original and a new value.
Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers.
Speed Distance Time Calculator
Calculate distance traveled from speed and travel time in hours and minutes.
Time Zone Converter
Convert a date and time across common time zones.
Tip Calculator
Calculate tip amount, total bill, and per-person split in one step.
Unit Converter
Convert between common units for length, weight, speed, and temperature.
Random Generators (11)
Generate names, quotes, colors, passwords, numbers, and playful creative data.
Coin Flip Simulator
Flip a virtual coin repeatedly and track heads-versus-tails results.
Pronounceable Password Generator
Generate strong password phrases built from pronounceable chunks.
Random Address Generator
Create plausible sample street addresses for demos and testing.
Random Avatar Generator
Create simple SVG identicon-style avatars from a seed.
Random Color Generator
Generate random HEX and RGB colors with instant swatches.
Random Credit Card Generator
Generate Luhn-valid test card numbers for sandbox environments.
Random Emoji Generator
Generate emoji mixes for reactions, bios, and fun prompts.
Random Name Generator
Generate first and last name combinations for mock data.
Random Number Generator
Generate integers or decimals within a custom range.
Random Phone Number Generator
Generate formatted sample phone numbers for test data use.
Random Quote Generator
Pull inspirational and practical quote snippets from a local set.
Audio & Media (8)
Record, visualize, and synthesize sound with lightweight browser-native tools.
Audio Recorder
Record microphone input and download the captured audio.
Audio Waveform Visualizer
Load an audio file and inspect its waveform in the browser.
Beat Interval Calculator
Convert BPM into beat, bar, and loop timing intervals in milliseconds.
BPM Tap Tempo & Delay Time Calculator
Tap a tempo or enter BPM to calculate note divisions, delay times, and loop-friendly timing values. It helps producers and musicians line up effects and timing without a DAW plugin.
Frequency to Note Converter
Convert audio frequencies to the nearest musical note and cents offset.
Metronome
Practice with a browser-based metronome and adjustable tempo.
Tone Generator
Generate sine, square, triangle, and sawtooth tones in the browser.
White Noise Generator
Generate looping white, pink-style, or brown-ish noise textures locally.
File Tools (9)
Inspect, split, merge, archive, and checksum files locally.
Base64 File Encoder
Encode uploaded files to Base64 strings in the browser without server uploads.
Checksum Calculator
Calculate CRC32, simulated MD5, and SHA-256 hashes for uploaded files.
File Merger
Merge multiple text files into one combined output with separators.
File Splitter
Split text files by line count or approximate chunk size.
Filename Sanitizer
Normalize messy file names for safer downloads, uploads, and archives.
Line Ending Converter
Convert text between LF and CRLF line endings for editor and repo consistency.
MIME Type Detector
Inspect uploaded files for MIME type, extension, and signature hints.
PDF Metadata Privacy Checker
Inspect PDF author, title, subject, timestamps, and hidden metadata before sharing files. It helps teams remove accidental identifiers from proposals, resumes, and reports without sending documents to a server.
ZIP File Compressor
Bundle multiple files into a downloadable ZIP archive locally.
Accessibility (6)
Audit navigation, labels, and UX details that improve keyboard and screen-reader support.
Accessibility Focus Order Visualizer
Map keyboard tab order, skip-link flow, and focus traps from pasted HTML so teams can catch navigation issues before shipping. The visual overlay makes a11y reviews faster for product, QA, and frontend teams.
Alt Text Length Checker
Review image alt text for length, clarity, duplication, and decorative-image handling. It helps content teams write accessible image descriptions without relying on AI or third-party APIs.
ARIA Label Reviewer
Review interactive elements for missing accessible names and weak ARIA labeling.
Color Contrast Checker
Check foreground and background color contrast against common WCAG thresholds.
Focusable Elements Checker
List focusable controls, tabindex order, and skip-link coverage from pasted markup.
Heading Structure Outline
Audit pasted HTML for heading order, skipped levels, and document outline clarity.
Data & Analytics (6)
Inspect structured exports, logs, charts, and browser diagnostics without uploading files.
CSV Column Profiler
Profile CSV headers, fill rates, and likely column types from pasted data.
Data Size Estimator
Estimate dataset storage growth from row counts and average row sizes.
Generate Chart
Turn pasted CSV, JSON, or plain text into configurable charts and downloadable reports.
HAR File Viewer & API Timeline Analyzer
Open HAR exports locally and turn them into a sortable timeline for slow requests, waterfalls, headers, and payload sizes. It helps engineering and QA teams diagnose frontend performance without uploading logs.
Ping Test Tool
Test round-trip request latency to a public URL with browser-safe fetch timing and packet-loss estimates.
WiFi Speed Test
Measure same-origin download speed, upload speed, latency, and connection quality with browser-safe benchmarks.
Financial & Business (7)
Model pricing, margin, billing, and break-even decisions with privacy-first calculators.
Break-Even Calculator
Calculate break-even units, target revenue, and contribution margin with interactive charts and scenario sliders. It gives founders, operators, and consultants a fast way to test pricing and cost assumptions privately.
Invoice Due Date & Late Fee Calculator
Calculate due dates, grace periods, and simple late-fee scenarios for invoices across common billing terms. It helps freelancers and small businesses stay organized without relying on online accounting portals.
Pricing Markup Calculator
Turn unit cost and target markup into a selling price and gross margin estimate.
Profit Margin Calculator
Calculate profit, markup, and margin from revenue and cost inputs instantly.
SaaS Pricing Margin Calculator
Model SaaS pricing tiers, gross margin, payback period, and annual recurring revenue from your own assumptions. It helps operators and growth teams reason about pricing without handing numbers to external calculators.
Sales Tax Calculator
Calculate tax-inclusive totals and tax amounts from any subtotal and rate.
Subscription Revenue Forecast
Project customer growth, churn, MRR, and ARR from recurring revenue assumptions.
Engineering & Technical (6)
Solve practical electrical and technical calculations with visual references and unit-aware math.
Capacitor Charge Discharge Calculator
Estimate RC time constants and common charge thresholds for timing circuits.
LED Series Resistor Calculator
Calculate a safe resistor value and power rating for single-LED circuits.
Ohm’s Law & Power Triangle Calculator
Calculate voltage, current, resistance, power, and related electrical values with unit switching and visual formulas. It is ideal for students, technicians, and makers who need quick checks with clear explanations.
Power Supply Runtime Calculator
Estimate battery runtime from capacity and expected load current.
Resistor Color Code Calculator
Decode resistor bands visually, calculate tolerance, and switch between 4-band, 5-band, and 6-band modes. It helps electronics learners and hobbyists avoid common reading mistakes.
Voltage Divider Calculator
Calculate divided output voltage and resistor ratios for simple analog circuits.
Education & Learning (5)
Visualize concepts, build study plans, and turn abstract topics into interactive practice.
Flashcard Randomizer
Shuffle flashcard prompts from a custom list for quick exam practice.
Fraction Simplifier Calculator
Reduce fractions to lowest terms and convert them to decimals and percentages.
Scientific Notation Converter
Convert numbers between expanded form and scientific notation instantly.
Study Session Planner
Build focused study blocks with short breaks and long-break intervals.
Unit Circle Visualizer
Explore angles, radians, coordinates, sine, cosine, and tangent with an interactive unit circle and labeled quadrants. It turns a memorization-heavy topic into a visual learning experience.
Astronomy & Space (5)
Compare optics, sky-view calculations, and observational planning data in the browser.
Escape Velocity Calculator
Calculate escape velocity from planetary mass and radius estimates.
Moon Phase Finder
Estimate the moon phase and illumination for any calendar date.
Planet Weight Calculator
Compare your Earth weight against gravity on planets and the moon.
Telescope Field of View Calculator
Estimate telescope magnification, true field of view, and exit pupil using aperture, focal length, and eyepiece data. It helps astronomy hobbyists compare setups before a night of observing.
Telescope Magnification Comparator
Compare eyepiece magnification and field-of-view tradeoffs for one telescope setup.
Help Centre
Frequently Asked Questions
26 answers across 3 topics — every answer links directly to a relevant tool or page.
Search & Visibility
Tools & Workflows
Privacy, Performance & Access
Embeddable Tools — drop an <iframe> anywhere
These standalone pages work out of the box on any website.