90+ browser-based tools for developers, writers, and everyone else. No signup. No data sent to servers. Just tools that work.
Format, validate, and beautify JSON data instantly.
Encode text to Base64 or decode Base64 back to plain text.
Test and debug regular expressions with live highlighting.
Convert between HEX, RGB, and HSL color formats.
Compare two blocks of text and highlight the differences.
Decode and inspect JSON Web Token headers and payloads.
Encode special characters in URLs or decode encoded strings.
Generate RFC-compliant UUID v4 identifiers. Single or bulk output.
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files.
Minify CSS for production or beautify compressed stylesheets.
Format and prettify SQL queries or minify them for production.
Build and decode cron expressions with a human-readable preview.
Convert JSON data to CSV format with custom delimiters.
Encode and decode HTML entities with a reference grid.
Calculate Unix file permissions with an interactive grid.
Searchable HTTP status code reference with descriptions.
Format and syntax-highlight JSON, XML, and API responses.
Count words, characters, sentences and estimate reading time.
Convert text to UPPER, lower, Title, camelCase, and more.
Remove extra spaces, blank lines, and clean up messy text.
Sort lines of text alphabetically, by length, or reverse order.
Convert titles and phrases into SEO-friendly URL slugs.
Generate custom lorem ipsum placeholder text in seconds.
Write Markdown and preview the rendered output in real time.
Convert text to speech with voice, speed, and pitch controls.
Generate Unicode fancy fonts and text styles for social media.
Browse, search, and copy emojis organized by category.
Detect and remove invisible characters from your text.
Calculate your exact age in years, months, and days.
Calculate Body Mass Index and find your healthy weight range.
Calculate perfect tips and split bills between a group.
Quickly calculate percentages, discounts and changes.
Convert length, weight, temperature, volume and more.
Calculate and visualize compound interest growth over time.
Generate strong, secure passwords with custom options.
Create QR codes for URLs, text, and more. Download instantly.
Generate beautiful, harmonious color palettes for your projects.
Generate random numbers, roll dice, and pick from lists.
Calculate the exact number of days, months, or years between two dates.
Convert Unix timestamps to readable dates and vice versa.
Convert time between any two time zones around the world.
Create a live countdown to any future date and event.
Format any date into dozens of common date string formats.
Full scientific calculator with trig, logarithm, and power functions.
Calculate mean, median, mode, standard deviation and more.
Convert numbers between binary, octal, decimal, and hexadecimal.
Add, subtract, multiply, and divide fractions with full working shown.
Convert numbers to Roman numerals and decode Roman numerals back.
Add, subtract, multiply, transpose, and invert matrices.
Solve quadratic equations with step-by-step solutions and graphs.
Check primality, find factors, and discover primes in a range.
Generate SEO, Open Graph, and Twitter Card meta tags with live preview.
Paste any text to see word count, reading time, and speaking time.
Create professional invoices with line items, tax, and PDF export.
Generate relevant hashtags for Instagram, TikTok, Twitter, and LinkedIn.
Convert CSV data to JSON with multiple output formats.
Convert between YAML and JSON bidirectionally.
Convert Markdown to HTML with a live split-pane editor.
Combine multiple images into a single PDF document.
Extract and render PDF pages as downloadable images.
Analyze and score HTML meta tags with Google preview.
Build robots.txt files with presets and custom rules.
Preview Open Graph social cards for Facebook, Twitter, and LinkedIn.
Simulate and visualize HTTP redirect chains.
Generate JSON-LD structured data for 8 schema types.
Analyze password entropy, crack time, and strength score.
Lookup IP address geolocation, ISP, and network info.
Parse and analyze browser user agent strings.
Trace email headers and analyze SPF/DKIM/DMARC.
Generate a customizable privacy policy for your website.
Precision stopwatch with lap times and keyboard shortcuts.
Focus timer using the Pomodoro technique with session tracking.
Multi-tab notepad with auto-save and localStorage persistence.
Detect your display resolution, viewport, and device info.
Test your typing speed in WPM with accuracy tracking.
Estimate your download speed directly in your browser.
Generate random colors, palettes, and color harmonies.
ToolNook is a collection of 90+ fast, free, browser-based tools designed for developers, writers, students, and anyone who needs a quick utility without the hassle of installing software or creating accounts. Every tool runs entirely in your browser — your data never leaves your device.
Our developer tools include a JSON formatter and validator, Base64 encoder/decoder, regex tester with live match highlighting, color code converter, text diff checker, JWT decoder, UUID generator, SHA hash generator, CSS minifier, SQL formatter, and cron expression builder.
Our text tools include a word and character counter with reading time estimates, case converter (camelCase, Title Case, UPPER, lower), text cleaner, line sorter, URL slug generator, lorem ipsum generator, and a live Markdown previewer.
Quick calculators that work instantly: age calculator, BMI calculator, tip and bill splitter, percentage calculator, unit converter, compound interest calculator, loan calculator, mortgage calculator, and currency converter.
Browser-based image utilities: image resizer with JPEG/PNG/WebP export, image to Base64 converter for embedding images in code, and an image color picker for extracting HEX, RGB and HSL values from any photo.
Tools for content creators: SEO meta tag generator with Open Graph and Twitter Card support, reading time calculator, free invoice generator with PDF export, and a hashtag generator for Instagram, TikTok, and Twitter.
Social Media Tools
Tweet Character Counter
Count characters for Twitter/X posts with URL detection.
Instagram Caption Editor
Format captions with hashtags and live preview.
YouTube Thumbnail Preview
Preview YouTube thumbnails in search, homepage, and sidebar.
Social Image Resizer
Resize images to exact dimensions for any social platform.
Bio Link Generator
Create a link-in-bio page with themes and custom links.