30+ Free Developer Tools — No Sign-up Required

Free Online Developer Tools

JSON formatter, Base64 encoder, UUID generator, password tools and more. All run in your browser — nothing is sent to any server.

100% FreeNo Sign-upPrivacy First

JSON

JSON Formatter

Format & beautify JSON

JSON Stringify

Stringify JS objects to JSON

JSON Repair

Fix broken JSON automatically

Encoding

Base64 Encoder

Encode text to Base64

Base64 Decoder

Decode Base64 to text

URL Encoder

Encode URLs safely

URL Decoder

Decode encoded URLs

JWT Decoder

Decode & inspect JWT tokens

Hash Generator

Generate SHA-1, SHA-256, SHA-512 hashes

Generators

UUID Generator

Generate unique UUIDs

Password Generator

Create strong passwords

Random Number Generator

Generate random numbers

QR Code Generator

Create QR codes instantly

Lorem Ipsum Generator

Generate placeholder text

Slug Generator

Convert text to URL slugs

Code

JS Minifier

Minify JavaScript code

JS Beautifier

Beautify JavaScript code

CSS Minifier

Minify CSS stylesheets

CSS Beautifier

Beautify CSS stylesheets

HTML Minifier

Minify HTML markup

HTML Beautifier

Beautify HTML markup

Diff Checker

Compare two text blocks

Regex Tester

Test regular expressions

Text

Text Case Converter

Convert text case styles

Character Counter

Count characters & words

Text Sorter

Sort lines alphabetically

Duplicate Line Remover

Remove duplicate lines

Text Reverser

Reverse text or lines

Converters

Timestamp Converter

Convert Unix timestamps

Color Converter

Convert HEX, RGB, HSL

URL Parser

Parse & inspect URLs

Why Developers Choose DevWithTools

Instant Results

Every tool runs in your browser. No server round-trips, no waiting.

100% Private

Your data never leaves your device. Nothing is stored or transmitted.

Always Free

No sign-up, no paywall, no subscription. Free forever.

30+ Tools

JSON, encoding, generators, code formatters, text tools, and more.

Developer Guides & Tutorials

Learn how the tools work under the hood

View all

AI & Development

RAG Explained for Developers

Ground your AI in real data with retrieval-augmented generation.

Jul 8, 2026

HTTP & APIs

CORS Explained: Everything Developers Need to Know

How CORS works, preflight requests, headers, and common errors.

Jun 29, 2026

API Security

Rate Limiting Explained

Algorithms, HTTP 429, Redis implementation, and best practices.

Jun 27, 2026

API Development

Caching Explained (Browser, CDN, Server, DB)

Complete guide to caching at every layer with Redis examples.

Jul 3, 2026

API Design

API Gateway Explained

Architecture, benefits, popular options, and when to use one.

Jul 1, 2026

Code

Regex Cheat Sheet: 50+ Patterns

Copy-paste ready patterns for validation, parsing, and text manipulation.

Jun 29, 2026