DevTools - Free Developer Tools That Run in Your Browser

DevTools

Formatters & Converters

JSON Tools

Format, diff, validate — stop wrestling with broken JSON

XML Tools

Format, diff, validate — easily handle XML data

SVG Tools

Optimize, minify, and preview SVG graphics client-side

HTML Tools

Format, minify, and validate HTML markup instantly

CSS Tools

Format and minify CSS stylesheets with size stats

SQL Tools

Format and minify SQL queries across 5 dialects

YAML Tools

Format, validate, and convert YAML ↔ JSON

Unix Timestamp Converter

Convert unix ↔ ISO ↔ relative time with a live ticker

CSV Tools

Parse, preview, and convert CSV ↔ JSON

Text Tools

Diff, convert case, and clean messy text in seconds

Base64 Tools

Encode files or decode Base64 — drag and drop

URL Encode / Decode

Fix mangled URLs with one click

HTML Entity Encode / Decode

Make special characters HTML-safe instantly

cURL Converter

Paste cURL, get fetch/Axios/Python code

Number Base Converter

Binary to hex and everything between — all bases at once

CSS Unit Converter

px to rem and back — with your real viewport size

Color Picker

Pick colors and build harmonious palettes

Markdown Preview

Write Markdown, see the result live

Generators

ID Generator

UUIDs and ULIDs for every version you need

Hash Generator

MD5, SHA-256, SHA-512 — all hashes at once

Bcrypt / Argon2 Hasher

Hash passwords with production-grade algorithms

RSA Key Generator

Generate RSA keys without remembering OpenSSL commands

Password Generator

Strong passwords with entropy scoring built in

Passphrase Generator

Strong passphrases from a curated word list

QR Code Generator

Custom QR codes with your colors and size

Git Branch Generator

Consistent branch names without the naming debates

Fancy Text Generator

110 Unicode styles — bold, script, circled, and more

Leet Text Encoder / Decoder

10 leet speak variants with auto-detect decoder

Text Art Generator

ASCII banners, text boxes, and Unicode block art

Network & API

API Request Builder

Test APIs without installing Postman

HTTP Header Parser

Parse raw HTTP headers to dynamic tables and cURL

WebSocket Tester

Debug WebSocket connections in real-time

CORS Checker

Fix CORS errors — see exactly which headers are missing

Certificate Decoder

Decode SSL certs without OpenSSL

User Agent Analyzer

Decode any User-Agent string instantly

DNS Lookup

Check DNS records without opening a terminal

STUN Server Checker

Test STUN connectivity and discover your public IP

TURN Server Checker

Test TURN relay allocation and verify credentials

Webhook Tester

Spin up a temporary endpoint, inspect incoming HTTP requests

IP & CIDR Tools

Analyze IPs, calculate subnets, detect types

Reference

Regex Tester

Test regex live — see matches as you type

HTTP Status Codes

Every status code explained in plain English

MIME Type Reference

Stop Googling MIME types — look them up here

Content-Type Reference

HTTP Content-Type headers with usage guides and one-click copy

Unicode Lookup

Find any character and copy in every format

ASCII Table

Searchable ASCII reference with one-click copy

Emoji Picker

1,900+ emojis — click to copy for any platform

Sample Data

Ready-to-use JSON, XML, Text, and Base64 sample data templates

Utilities

CRON Builder

Build cron expressions without memorizing syntax

Web Playground

Lightweight sandboxed HTML/JS/CSS playground

Unit Converter

Data sizes, time durations, and timezones

Temporary Email Checker

Detect disposable and temporary email domains

Free Email Checker

Detect free email provider domains like Gmail, Yahoo, Outlook

Spam Words Checker

Detect spam trigger words in your email content

Timezones

World clock and timezone database for 247 countries

RSS Analyzer

Analyze RSS and Atom feeds, view items and structures

Share Text URL Shortener

Documentation

Master every tool in under 2 minutes

DevTools

53+ free developer tools that run entirely in your browser. No installs, no sign-ups, no data leaves your machine.

GitHub Email

Formatters & Converters

JSON Tools
XML Tools
SVG Tools
HTML Tools
CSS Tools
SQL Tools
YAML Tools
Unix Timestamp Converter
CSV Tools
Text Tools
Base64 Tools
URL Encode / Decode
HTML Entity Encode / Decode
cURL Converter
Number Base Converter
CSS Unit Converter
Color Picker
Markdown Preview

Generators

ID Generator
Hash Generator
Bcrypt / Argon2 Hasher
RSA Key Generator
Password Generator
Passphrase Generator
QR Code Generator
Git Branch Generator
Fancy Text Generator
Leet Text Encoder / Decoder
Text Art Generator

Reference

Regex Tester
HTTP Status Codes
MIME Type Reference
Content-Type Reference
Unicode Lookup
ASCII Table
Emoji Picker
Sample Data

Utilities

CRON Builder
Web Playground
Unit Converter
Temporary Email Checker
Free Email Checker
Spam Words Checker
Timezones
RSS Analyzer

Resources

Documentation
Share Text
URL Shortener

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