Build faster
Developer Tools
Format, validate, encode, and inspect data in seconds.
JSON Formatter & Validator
Prettify, minify, validate, and copy JSON with real-time feedback.
Base64 Encoder/Decoder
Encode and decode text safely, including Unicode content.
Password Generator
Create strong passwords with controllable length and character rules.
Regex Tester
Test regex patterns with live match highlighting and group inspection.
UUID Generator
Generate fast UUID v4 identifiers in batches right in your browser.
Markdown Previewer
Write markdown and preview formatted output instantly side by side.
Nearby Categories
Related Guides
Keep exploring the common workflows in this category
How to Format JSON Without Breaking API Payloads
A practical guide to formatting, validating, and minifying JSON safely during API debugging and handoff workflows.
Base64 vs URL Encoding: When to Use Each
Understand the difference between Base64 and URL encoding so you can choose the right format in debugging, API work, and browser tasks.
How to Test Regex Safely in JavaScript
Learn how to validate regex patterns, inspect capture groups, and avoid common JavaScript regex mistakes during development.
Category Overview
What you can get done in this section
Developer Tools on FreeUtils.online focuses on fast, browser-based workflows. Instead of mixing unrelated utilities together, this section groups closely related tasks so users can move from one job to the next without starting over.
Within this section, users can already access JSON Formatter & Validator, Base64 Encoder/Decoder, Password Generator, Regex Tester, UUID Generator, Markdown Previewer. Keeping those tools together makes it easier to compare nearby workflows and finish related tasks without hunting through the rest of the site.