100+ Free Developer Tools

Fast, private, browser-based. Your data never leaves your device.

100% client-side processing

Popular

Pretty print, minify & validate JSON data

Image Compressor

Compress JPG, PNG & WebP images in your browser

Timestamp↔Date

Convert between Unix timestamps and human dates

Base64 Encode/Decode

Encode and decode text or files in Base64

All Tools

Count words, characters & sentences in real time

Convert text between upper, lower, title & more cases

Generate clean URL-friendly slugs from text

Generate placeholder text in various lengths

Markdown Preview

Write Markdown and preview rendered HTML live

Pretty print, minify & validate JSON data

Convert between YAML and JSON formats

Extract plain text from HTML markup

Test regular expressions with live match highlighting

Compare two texts and see differences highlighted

Pick any color and copy its HEX, RGB or HSL value

Convert between HEX, RGB, and HSL color formats

Generate harmonious color palettes automatically

Contrast Checker

Check WCAG color contrast ratio for accessibility

Create CSS gradients with a visual editor

Design box shadows with live CSS output

Visualize and generate CSS border-radius values

Generate multi-size favicons from any image

Calculate fluid responsive CSS clamp() values

Tailwind Lookup

Search and browse Tailwind CSS utility classes

Image Compressor

Compress JPG, PNG & WebP images in your browser

Resize images with aspect ratio lock

Convert images between PNG, WebP, JPG & AVIF

Crop images with preset or custom ratios

View and remove image metadata (EXIF data)

Optimize and compress SVG files

Extract individual frames from animated GIFs

Trim video clips entirely in your browser

Convert audio between MP3, WAV, OGG & AAC

Combine multiple SVGs into one sprite sheet

Timestamp↔Date

Convert between Unix timestamps and human dates

Parse cron expressions into human-readable schedules

Calculate exact age from any birthdate

Calculate the duration between two dates

Convert times between any world timezones

Find the ISO week number for any date

Create countdowns to any future date

Add or subtract days, weeks, months from a date

Workdays Calculator

Count working days between two dates

Generate printable monthly calendars

Convert between units of length, weight, volume & more

Percentage Calculator

Calculate percentages, increases & decreases

Triangle Solver

Calculate triangle sides and angles

Check if a number is prime and find factors

Quadratic Solver

Solve quadratic equations with steps

Matrix Operations

Perform matrix addition, multiplication & inverse

Currency Converter

Convert between world currencies

Convert between Roman and Arabic numerals

Convert numbers between any base (2, 8, 10, 16...)

Measure real-world objects using your screen

Random Number Generator

Generate random numbers with custom ranges

Base64 Encode/Decode

Encode and decode text or files in Base64

URL Encode/Decode

Encode and decode URL components

Decode and inspect JWT token contents

Compute MD5 hash of text or files

Compute SHA-256 hash of text or files

Generate random UUID v4 identifiers

Hash passwords with Bcrypt

QR Code Generator

Create QR codes with custom size and colors

Barcode Generator

Generate Code128, EAN & UPC barcodes

Password Strength

Analyze password strength and crack time

JSON→TypeScript

Generate TypeScript interfaces from JSON data

HTTP Status Lookup

Search HTTP status codes with descriptions

Parse User-Agent strings into readable components

MIME Type Search

Look up file extensions and their MIME types

Query DNS records for any domain

Show your public IP address with geolocation

Create and sign JWT tokens locally

UUID v5 Generator

Generate deterministic UUID v5 from namespace + name

RegEx Cheatsheet

Quick reference for regular expression syntax

Compare two JSON objects and see structural differences

Placeholder Image

Generate placeholder images with custom dimensions

Fake User Generator

Generate realistic fake user profiles

Generate random colors with one click

Generate random names for characters or projects

Quote Generator

Get random inspirational and famous quotes

Password Generator

Generate secure passwords with custom rules

UUID Batch Generator

Generate multiple UUIDs at once (up to 1000)

Roll any combination of RPG dice

Generate random lottery number combinations

Get random creative writing prompts for inspiration

Convert CSV data to JSON format

Flatten JSON arrays to CSV format

Generate table of contents from Markdown headings

Convert plain text to downloadable PDF files

Combine multiple PDF files into one

Extract specific pages from a PDF

Convert Excel spreadsheets to JSON

Extract ZIP file contents in your browser

Combine multiple images into a PDF document

Compute MD5, SHA-1 & SHA-256 checksums of files

Upload and preview CSV files as sortable tables

Visualize JSON data as interactive charts

Mermaid Preview

Render Mermaid diagrams from text

Render GeoJSON data on an interactive map

Base64 Image Preview

Preview images encoded as Base64 strings

Live HTML Editor

Write HTML/CSS/JS and preview instantly

Paste tabular data to sort, filter & export

Break down URLs into their components

Email Validator

Validate email address format with RFC rules

Validate credit card numbers with the Luhn algorithm

Convert curl commands to JavaScript, Python & Go code

Flexbox Playground

Visualize and generate CSS flexbox layouts interactively

Meta Tag Generator

Generate HTML meta tags for SEO and social sharing

Format and minify SQL queries with keyword highlighting

Chmod Calculator

Convert between numeric and symbolic file permissions

PX to REM Converter

Convert between px, rem, and em units

.gitignore Generator

Generate .gitignore files from popular templates

Mortgage Calculator

Calculate monthly payments and amortization schedules

Focus timer with work sessions and break intervals

Typing Speed Test

Test your typing speed and accuracy in real time