Developer Tools

Fast, offline-capable utilities for encoding, parsing, debugging, and generating. 19 tools, zero ads in the tool itself, no data leaves your browser.

Most developer utility sites make you wait for three trackers to load before you can decode a JWT or format a blob of JSON. These do not. Every tool here runs client-side in your browser, which means your payload never touches our server. If you’re pasting in a production API key to inspect it, that is an important property.

Bookmark the ones you use. They work offline after first load.

Encoding and data formats

The daily glue code. JSON formatting, Base64 round-trips, URL percent-encoding, hashes for integrity checks, and regex testing. Every one of these is five clicks away from an IDE plugin, but two clicks away from here.

JSON Formatter — prettify, minify, and validate any JSON blob
Base64 Encoder / Decoder — text and binary-safe Base64 with URL-safe variant
URL Encoder / Decoder — percent-encoding for query strings, form data, and HTML entities
Hash Generator — MD5, SHA-1, SHA-256, SHA-512 on any input
Regex Tester — live pattern matching with capture group highlighting

Tokens, timestamps, and formats

Debugging authentication and scheduled jobs usually means staring at a JWT or a cron expression until it makes sense. These tools make it make sense faster.

JWT Decoder — inspect header, payload, and signature without sending anywhere
Unix Timestamp Converter — epoch to human-readable in any timezone
Cron Expression Generator — visual builder plus next-run-time preview
.env File Validator — syntax check with common-mistake warnings
Password Strength Checker — entropy estimate and crack-time projection

Web and design

Frontend work constantly needs color conversion, gradient code, favicons in eight sizes, images compressed without quality loss, and meta tags that preview correctly on every platform. These five cover the everyday cases.

Color Converter — HEX, RGB, HSL, and HSV round-trips
CSS Gradient Generator — linear, radial, and conic with copy-ready CSS
Favicon Generator — all required sizes from a single upload
Image Compressor — JPEG, PNG, and WebP with quality-vs-size preview
Meta Tag Generator — Open Graph, Twitter Card, and SEO tags in one output

Generators and network utilities

The utilities that don’t quite fit elsewhere but you reach for often: strong passwords, QR codes for anything printable, subnet math that isn’t worth memorizing, and the YouTube thumbnail grab that always seems to come up for blog posts.

Password Generator — configurable length, character sets, and entropy
QR Code Generator — URLs, text, or vCards with downloadable PNG
IP Subnet Calculator — CIDR math with network, broadcast, and host ranges
YouTube Thumbnail Downloader — all four resolutions from any video URL