21 free tools · 100% on your device

Developer tools

Encoders, decoders, formatters, regex, hashes, IDs and quick references for everyday development. Private and offline.

Text & patterns

Regex Tester

Test regular expressions with live highlighting and groups.

Diff Checker

Compare two files or code snippets line by line.

Encode & decode

JWT Decoder

Decode JSON Web Tokens and check expiry and signatures.

Base64 Encoder and Decoder

Encode text to Base64 or decode Base64, with URL-safe mode.

URL Encoder and Decoder

Percent-encode or decode text for URLs.

HTML Encoder and Decoder

Escape HTML special characters or decode entities.

JSON Escape and Unescape

Turn text into a JSON string literal, or back again.

Hash Generator

MD5, SHA-1, SHA-256, SHA-384 and SHA-512 of any text.

Generate

UUID Generator

Random v4 or time-ordered v7 UUIDs, one or a thousand.

Nano ID Generator

Short, URL-safe random IDs of any length.

Time

Timestamp Converter

Convert Unix timestamps to dates and dates to timestamps.

Cron Expression Helper

Explain cron schedules in English and list the next runs.

Reference

HTTP Status Codes

Every HTTP status code with a plain-English meaning.

MIME Type Lookup

Find the MIME type for a file extension, or the reverse.

Format

CSS Formatter and Minifier

Beautify messy CSS or minify it for production.

HTML Formatter

Indent HTML neatly, keeping scripts and pre blocks intact.

SQL Formatter

Format SQL queries for MySQL, PostgreSQL, SQLite and more.

XML Formatter

Pretty-print or minify XML and check that it is well-formed.

HTTP

cURL Converter

Turn a curl command into JavaScript fetch, Python or PHP.

URL Parser

Break a URL into protocol, host, path, query and fragment.

Query String Parser

Turn ?a=1&b=2 into a readable table and JSON.