Developer Toolbox

RGB to HEX converter

Convert RGB color values to hexadecimal

RGBA to HEX converter

Convert RGBA values to hex, alpha included

HEX to RGB converter

Convert hexadecimal colors to RGB

HEX to OKLCH converter

Convert hex codes to the OKLCH color space

Color picker

Pick a color and copy HEX, RGB, HSL or OKLCH

Color contrast checker

Check WCAG contrast ratios between two colors

Base64 encoder/decoder

Encode and decode text with Base64

URL encoder/decoder

Encode and decode URLs and query strings

HTML entity encoder/decoder

Escape and unescape HTML entities

Image to Base64 converter

Turn images into data URIs and back

JSON escape/unescape

Escape and unescape JSON string content

JSON formatter

Format, beautify and minify JSON

JSON validator

Validate JSON and pinpoint syntax errors

XML formatter

Format, beautify and validate XML

SQL formatter

Format SQL queries across common dialects

JSON to CSV converter

Convert JSON data to CSV

CSV to JSON converter

Convert CSV data to JSON

JSON ⇄ YAML converter

Convert between JSON and YAML

YAML to Go converter

Generate Go structs from YAML

XML ⇄ JSON converter

Convert between XML and JSON

Markdown ⇄ HTML converter

Convert Markdown to HTML and back, with preview

JSON to TypeScript converter

Generate TypeScript types from JSON

JSON to Go converter

Generate Go structs from JSON

curl to code converter

Turn curl commands into fetch, Python and more

Compression comparison

Compress a file with Gzip, Brotli & Zstd and compare

Case converter

Convert text between naming conventions

Word counter

Count words, characters and reading time

Diff checker

Compare two texts and highlight changes

Lorem ipsum generator

Generate placeholder text for mockups

PX to REM converter

Convert pixels to rem at any base size

CSS gradient generator

Build linear, radial and conic gradients

Box-shadow generator

Design layered shadows and copy the CSS

Timestamp converter

Convert timestamps to readable dates

Regex tester

Test and debug regular expressions

HAR file viewer

Inspect and analyze HTTP Archive files

Cron expression parser

Parse, build and explain cron schedules

User agent parser

Identify browser, OS and device from a UA string

URL parser

Split URLs into parts, query params as JSON

Cookie parser

Inspect cookie strings and Set-Cookie headers

Meta tag previewer

Preview Google, X and Facebook link cards

One-time file sharing

Share a file via a link that expires in an hour and self-destructs after one download

AWS IAM policy explainer

Explain AWS IAM policies and role trust policies in plain English

JWT decoder

Decode and inspect JSON Web Tokens

Token generator

Generate secure random tokens

Hash generator

Compute MD5, SHA-256 and other digests

Password generator

Generate strong random passwords locally

UUID generator

Generate UUID v4 and v7 identifiers in bulk

QR code generator

Create downloadable QR codes from text or URLs

Favicon generator

Build a complete favicon set from one image

LLM token counter

Count and visualize tokens for GPT, Claude, Gemini and Llama

LLM API cost calculator

Estimate and compare API costs across LLM models

Context window checker

Check if your prompt fits a model's context window

JSON Schema builder

Build structured-output schemas for LLM tool use

JSONL validator

Validate and inspect JSONL fine-tuning datasets

Invisible character cleaner

Detect and remove hidden Unicode and prompt-injection characters

Binary translator

Translate text to binary and back, plus base converters

Binary to decimal converter

Convert binary numbers to decimal

Decimal to binary converter

Convert decimal numbers to binary

Hex to decimal converter

Convert hexadecimal to decimal

Decimal to hex converter

Convert decimal numbers to hexadecimal

Binary to text converter

Decode binary into readable text

Text to binary converter

Convert text to binary in ASCII or UTF-8

Hex to binary converter

Convert hexadecimal to binary nibbles

Octal to decimal converter

Convert octal numbers to decimal

Binary calculator

Add, subtract and do bitwise binary math

TOML to JSON converter

Convert TOML to JSON and back

JSONPath tester

Query JSON with JSONPath expressions

YAML validator

Validate YAML and convert to JSON

Remove duplicate lines

Delete duplicate lines from text

Sort text lines

Sort lines alphabetically or numerically

Chmod calculator

Calculate Unix file permissions

HTML formatter

Format and beautify HTML

HTML minifier

Minify HTML to shrink page size

CSS beautifier

Beautify and format CSS

CSS minifier

Minify CSS to reduce file size

JavaScript beautifier

Beautify and format JavaScript

JavaScript minifier

Minify JavaScript to shrink bundle size

ASCII table

ASCII codes in decimal, hex, octal and binary

HTTP status codes

Every HTTP status code with meanings

HMAC generator

Generate HMAC signatures with SHA-1 to SHA-512

AES encryption

Encrypt and decrypt text with AES-GCM or AES-CBC

JWT generator

Sign JSON Web Tokens with HS256 or RS256

Bcrypt generator

Hash and verify passwords with bcrypt

Subnet calculator

Calculate IPv4 and IPv6 subnet ranges

CIDR calculator

Expand CIDR notation into address ranges

WebRTC ICE test

Test STUN and TURN servers and gather ICE candidates

WebRTC leak test

Check whether WebRTC leaks your real IP behind a VPN

Meta tag generator

Generate SEO, Open Graph and Twitter meta tags

gitignore generator

Build a .gitignore from language and OS templates

htaccess generator

Generate Apache .htaccess rewrite and redirect rules

HEIC to JPG converter

Convert iPhone HEIC photos to JPG in your browser

Image compressor

Compress JPG, PNG and WebP images privately

SVG to PNG converter

Rasterize SVG to PNG at any scale

PNG to JPG converter

Convert PNG images to JPG, in batch

JPG to PNG converter

Convert JPG images to PNG, in batch

WebP to PNG converter

Convert WebP images to PNG, in batch