Private - fast - free

Developer tools that stay in your browser

Format JSON, test regular expressions, convert timestamps and colours, generate UUIDs and passwords. No sign-up, no uploads, no tracking of what you type.

All tools

JSON Formatter & Validator

Pretty-print, validate and minify JSON with clear error positions.

Base64 Encoder & Decoder

Encode text to Base64 or decode it back, with URL-safe mode and full UTF-8 support.

URL Encoder, Decoder & Query Parser

Percent-encode or decode URLs and break a query string into readable parameters.

UUID v4 Generator & Validator

Generate random UUIDs in bulk and check whether a string is a valid UUID.

SHA-256 & SHA-512 Hash Generator

Compute SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text, instantly and privately.

Unix Timestamp Converter

Convert Unix epoch seconds or milliseconds to human dates and back.

Regex Tester

Test JavaScript regular expressions live with highlighted matches and capture groups.

Color Converter & Contrast Checker

Convert HEX, RGB and HSL and check WCAG contrast against white and black text.

Word Counter & Case Converter

Count words, characters and reading time, and convert between camelCase, snake_case, kebab-case, Title Case and more.

Secure Password Generator

Generate strong random passwords in your browser with adjustable length and character types.

Lorem Ipsum Generator

Generate placeholder paragraphs for designs and mock-ups in one click.

Binary, Hex & Decimal Converter

Convert numbers between binary, octal, decimal and hexadecimal, including very large values.

HTTP Status Codes

A searchable reference of every common HTTP status code and what it means.

Built for privacy

Most online tools send your input to a server. DevPocket does the opposite: the code is downloaded once and everything runs on your device with standard browser features such as the Web Crypto API. That makes it quick, works on a flaky connection, and keeps API payloads, tokens and drafts private.

Works on every screen

Use it on a phone while debugging on the move, on a laptop, or on an ultra-wide monitor. Light and dark themes follow your system setting, and all tools work with the keyboard.