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Developer

Developer tools — 18 free browser utilities

Format, validate and convert code, JSON, JWT and more. Everything runs locally: your files are never uploaded.

JSON Formatter & Validator

Format, minify and validate JSON in one click.

JSON Minifier

Shrink JSON to its smallest size.

Base64 Encoder / Decoder

Encode or decode text to and from base64.

URL Encoder / Decoder

Encode or decode URL strings safely.

HTML Formatter

Pretty-print messy HTML for readability.

CSS Formatter / Minifier

Pretty-print or minify CSS.

JavaScript Formatter / Minifier

Format or minify JavaScript.

XML Formatter

Pretty-print XML documents.

SQL Formatter

Format SQL queries for readability.

UUID Generator

Generate v4 UUIDs instantly, in bulk.

Timestamp Converter

Convert Unix timestamps to dates and back.

JWT Decoder

Decode JWT tokens without a server.

JWT Generator

Create signed JWTs from scratch.

Regex Tester

Test regular expressions live against your text.

Hash Generator

Hash text with MD5 and every SHA.

HTTP Status Code Lookup

Learn what every HTTP status means.

CSV to JSON

Convert CSV into clean, readable JSON.

Roman Numeral Converter

Convert to/from Roman numerals

Developer tools — quick answers

Are the developer tools free?
Yes — free and unlimited, with no account required.
Do they work offline?
Once a page has loaded, the tool keeps working even without a connection.
Can I use the output commercially?
Yes. There is no watermark and no attribution requirement on files you create.

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