11 free tools

Developer tools

Format, encode, decode, convert, and inspect development data with lightweight tools that work locally and require no setup.

✓ Test and transform data without installing software✓ Keep sensitive snippets on your device✓ Speed up repetitive development tasks

Start here

Popular developer tools

64Available

Developer

Base64 Encoder & Decoder

Encode Unicode text to Base64 or decode Base64 locally.

Open tool↗

Complete collection

All developer tools

11 available

{}Available

Developer

JSON Formatter

Format, validate, and minify JSON without uploading your data.

Open tool↗

64Available

Developer

Base64 Encoder & Decoder

Encode Unicode text to Base64 or decode Base64 locally.

Open tool↗

#Available

Developer

UUID Generator

Generate one or many random UUID v4 identifiers in your browser.

Open tool↗

JWTAvailable

Developer

JWT Decoder

Decode JWT header and payload sections without uploading the token.

Open tool↗

%Available

Developer

URL Encoder & Decoder

Encode URL components or decode percent-encoded text.

Open tool↗

MDAvailable

Developer

Markdown Preview

Write Markdown and preview formatted output locally.

Open tool↗

#Available

Developer

Hash Generator

Generate SHA hashes from text using your browser's Web Crypto API.

Open tool↗

⏳Available

Developer

Unix Timestamp Converter

Convert Unix timestamps to readable dates and back.

Open tool↗

🎨Available

Developer

Color Converter

Convert HEX colors to RGB and HSL values.

Open tool↗

CSVAvailable

Developer

JSON to CSV Converter

Convert a JSON array of objects into downloadable-style CSV text.

Open tool↗

01Available

Developer

Number Base Converter

Convert between binary, octal, decimal, and hexadecimal values.

Open tool↗

About this collection

Use developer tools without extra software

Format, encode, decode, convert, and inspect development data with lightweight tools that work locally and require no setup.

Open any tool, enter the requested values, and review the result immediately. Related tools on each page make it easier to continue a calculation or complete a connected task.

Do developer tools upload my code or data?

The tools are designed to run in your browser, but you should still avoid pasting secrets into any website.

Are decoded tokens verified?

A decoder may display token contents without verifying authenticity or signatures. Read the notice on the individual tool page.

Can I rely on output in production?

Validate important output in your own development workflow before using it in production systems.