Free Online Developer Tools

47 developer tools, all running 100% client-side in your browser. Fast, free, and private — your data never leaves your machine. No signup required.

100% Client-Side — Your Data Stays Private

Instant Results — No Server Round-Trips

Free Forever — No Signup Needed

Formatters & Beautifiers

JSON Formatter / Validator

Format, validate, and minify JSON

XML Formatter / Validator

Format and validate XML documents

HTML Formatter / Beautifier

Format and beautify HTML markup

CSS Formatter / Minifier

Format or minify CSS stylesheets

JS/TS Formatter

Format JavaScript and TypeScript code

SQL Formatter

Format SQL queries for readability

Markdown Preview

Preview Markdown with syntax highlighting

YAML Formatter

Format and validate YAML documents

Encoders & Decoders

Base64 Encode/Decode

Encode or decode text as Base64

Base64 File Encoder

Convert files to and from Base64

URL Encode / Decode

Encode or decode URL components

HTML Entity Encode/Decode

Encode or decode HTML entities

JWT Decoder

Decode and inspect JSON Web Tokens

Unicode Escape/Unescape

Escape or unescape Unicode characters

String / Text Tools

String Escape / Unescape

Escape or unescape strings for various languages

Text Case Converter

Convert text between camelCase, snake_case, UPPER, etc.

Text Diff / Compare

Compare two texts and highlight differences

Lorem Ipsum Generator

Generate placeholder text

Word / Character Counter

Count words, characters, sentences, and paragraphs

Remove Duplicate Lines

Remove duplicate lines from text

Sort Lines

Sort lines alphabetically, numerically, or by length

Reverse String / Lines

Reverse text or individual lines

Regex Tester

Test regular expressions with live highlighting

Backslash Escape/Unescape

Escape or unescape backslash sequences

Hash & Crypto

Hash Generator (MD5/SHA)

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

HMAC Generator

Generate HMAC signatures with a secret key

UUID / GUID Generator

Generate UUIDs (v4 and v7)

ULID Generator

Generate ULIDs (Universally Unique Lexicographically Sortable Identifiers)

Password Generator

Generate strong random passwords

Bcrypt Hash / Verify

Hash and verify passwords with bcrypt

Converters

JSON ↔ YAML

Convert between JSON and YAML formats

JSON ↔ CSV

Convert between JSON and CSV formats

JSON → TypeScript

Generate TypeScript interfaces from JSON

JSON → Go Struct

Generate Go structs from JSON

Number Base Converter

Convert numbers between binary, octal, decimal, and hex

Color Converter / Picker

Convert colors between HEX, RGB, HSL, and more

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates

Cron Expression Parser

Parse and explain cron schedule expressions

JSON Path Evaluator

Evaluate JSONPath expressions against JSON data

Px ↔ Rem Converter

Convert between pixels and rem units

Web / Network

HTTP Status Code Reference

Look up HTTP status codes and their meanings

MIME Type Lookup

Look up MIME types by file extension

URL Parser

Parse and inspect URL components

QR Code Generator

Generate QR codes from text or URLs

SVG Preview / Optimizer

Preview and optimize SVG files

Data Generators

Mock Data Generator

Generate realistic mock data for testing

Random Number/String Generator

Generate random numbers and strings

Why Use QuickDevTools?

QuickDevTools is a free collection of 47 essential developer utilities designed for everyday coding tasks. Every tool runs entirely in your browser — nothing is sent to a server. This means your API keys, tokens, JSON payloads, and private data stay completely on your machine.

Whether you need to format JSON, encode Base64 strings, generate UUIDs, test regular expressions, convert between data formats, or hash passwords, QuickDevTools has you covered. All tools load instantly with no signup, no ads, and no tracking.

Built with modern web technologies, QuickDevTools works on any device with a browser — desktop, tablet, or mobile. Bookmark your favorite tools and access them anytime.