UtilZilla / The collection

Developer.

The small utilities you reach for between bigger tasks. Format JSON, convert CSV, inspect tokens, compare data, and encode or decode a string.

17 tools, ready to go

Regex Tester

Inspect matches without freezing your page

XML / YAML / JSON Converter

Move data between structured formats

Color Contrast Checker

Check whether two colors are readable together

DNS Record Lookup

Inspect the records behind a domain

HTML Entity Encoder / Decoder

Encode or decode HTML special characters

CSV ↔ JSON Converter

Move structured data between CSV and JSON

JSON Formatter & Validator

Format, validate, and minify JSON data

JSON Compare

Semantically compare two JSON documents

UUID Generator

Generate random UUID v4 identifiers

Hash Generator

Generate MD5, SHA-1, SHA-256 hashes

JWT Decoder

Decode and verify JSON Web Tokens

Base64 Encoder/Decoder

Encode or decode Base64 strings

URL Encoder/Decoder

Encode or decode URL strings

Timestamp Converter

Convert Unix timestamps to readable dates

.gitignore Generator

Create a .gitignore file for any stack

CSS Gradient Generator

Design CSS gradients with a live preview

CSS Box Shadow Generator

Create CSS box-shadows with a live preview

Saved and recent tools are kept on this device. Your tool inputs and files are not saved.

Frequently Asked Questions

Yes. Every listed UtilZilla tool is free to use, with no account or subscription required.

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Click the bookmark beside a tool, then open the Saved view. Your saved list stays in this browser. Clearing site data will remove that list.