Free Developer Tools Online - JSON, Base64, Regex & More

Developer Tools

Free developer tools for everyday coding tasks

JSON formatting, Base64 encoding, regex testing, hash generation, and more. Browser-based tools that save you time on repetitive dev tasks.

Password Generator

Generate secure random passwords with customizable length, character types, and strength indicators.

Use tool

UUID Generator

Generate universally unique identifiers (UUID v4) in multiple formats for database keys and IDs.

Use tool

JSON Formatter

Format, validate, and minify JSON with syntax highlighting and error detection.

Use tool

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 strings with full UTF-8 support.

Use tool

Color Converter

Convert colors between HEX, RGB, HSL, and HSB with live preview and contrast checking.

Use tool

Lorem Ipsum Generator

Generate customizable placeholder text for design mockups, wireframes, and prototyping.

Use tool

Hash Generator

Generate SHA-256, SHA-512, SHA-384, and SHA-1 hashes for text and files in your browser.

Use tool

Regex Tester

Test and debug regular expressions with live matching, capture groups, and flag support.

Use tool

Unix Timestamp Converter

Convert Unix timestamps to dates and back. Live epoch clock with multiple timezone support.

Use tool

URL Encoder & Decoder

Encode and decode URLs with percent encoding. Parse URLs into components.

Use tool

Password Breach Checker

Check if your password has been exposed in data breaches. Private k-Anonymity model.

Use tool

User Agent Parser

Parse user agent strings to identify browser, OS, device type, and detect bots.

Use tool

JSON to CSV Converter

Convert between JSON and CSV with nested object support, custom delimiters, and preview.

Use tool

Random User Generator

Generate fake user profiles with photos, names, emails, and addresses for testing.

Use tool

Name Gender Guesser

Predict gender from first names with probability scores for marketing personalization.

Use tool

Number Base Converter

Convert between binary, hexadecimal, octal, and decimal with ASCII display.

Use tool

Why use free developer tools?

Stop context-switching to find a JSON formatter or Base64 decoder. These tools run entirely in your browser with zero data sent to servers. Format JSON, test regex patterns, generate UUIDs, convert timestamps, and encode URLs in seconds.

Every tool is designed for speed: paste your input, get your output, copy the result. No accounts, no rate limits, no tracking. Built by developers for developers.

Who are these tools for?

Frontend and backend developers debugging API responses, DevOps engineers checking headers and user agents, QA testers generating fake data, and anyone who needs quick data transformations without installing another CLI tool.

View all free tools →