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Utilities

Developer Tools Online

Developer utilities: JSON/YAML formatters, Base64, hash, JWT decode, cron, and MIME lookup — private.

JSON Formatter

Beautify or minify JSON locally.

YAML Formatter

Validate and tidy YAML-like text.

XML Formatter

Pretty-print well-formed XML.

Base64 Encode/Decode

Encode or decode text as Base64.

URL Encode/Decode

Percent-encode or decode strings.

Hash Generator

SHA-256, SHA-1, and more via Web Crypto.

JWT Decoder

Decode JWT header and payload (no verify).

UUID Generator

Generate UUID v4 values.

Query String Parser

Build or parse URL query strings.

Cron Explainer

Explain classic cron fields in plain English.

HTML Entities

Encode or decode HTML entities.

MIME Type Lookup

Look up common MIME types by extension.

HTTP Status Codes

Browse common HTTP status meanings.

.env ↔ JSON

Convert .env lines to JSON and back.

CSS Minify

Minify or lightly beautify CSS.

Markdown ↔ HTML

Convert Markdown to HTML locally.

About this developer tools online

Developer Tools Online formats or transforms developer data in your browser. Use this free developer tools online tool with no account — your input stays on your device.

Also a fit for free developer tools online, browser developer tools online, and developer tools online browser. Inputs stay on your device.

How to use Developer Tools Online

  1. Open this page. Start with developer tools online. The free tool loads in your browser — the same destination for searches like developer tools online.
  2. Add your input. Paste or type your content, values, or options. Nothing is uploaded; processing stays on your device.
  3. Review the result. Check the output for your developer tools online task before you copy it.
  4. Copy or download. Copy the result when you are done. Bookmark this developer tools online page if you use developer tools online often.

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Questions about developer tools online

Is developer tools online free on Mewix?

Yes. Developer Tools Online is free to use in your browser, with no upload and no account required.

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