Are these developer tools free?

Yes, all 27 developer tools are completely free with no usage limits, no account required, and no premium tier.

Is my data safe with these tools?

All tools run entirely in your browser using client-side JavaScript. No data is ever sent to our servers. You can verify this by opening your browser DevTools and checking the Network tab.

What developer tools are available?

JSON formatter, Base64 encoder/decoder, URL encoder, password generator, UUID generator, timestamp converter, regex tester, JWT decoder, SQL formatter, QR code generator, and 17 more.

Free Developer Tools — JSON, JWT, Base64 & More

Every tool here runs entirely in your browser — your JSON, tokens, passwords, and code never leave your device. No data is sent to any server, ever. Open DevTools and check the Network tab if you want proof. Whether you are debugging an API response, generating test data, or encoding strings for transport, these tools replace the throwaway scripts and browser extensions you have been juggling. All free, no account needed, works on any device.

Formatters & Validators

JSON Formatter

Format, validate and prettify JSON

Markdown Preview

Preview Markdown as rendered HTML

HTML Encoder/Decoder

Encode or decode HTML entities

JS / CSS Minifier

Minify JavaScript and CSS entirely in your browser

XML Formatter

Format, validate and prettify XML instantly

SQL Formatter

Format and beautify SQL queries with proper indentation

Encoders & Converters

Base64 Encoder/Decoder

Encode or decode Base64 strings

URL Encoder/Decoder

Encode or decode URLs and query strings

Color Converter

Convert between HEX, RGB and HSL

Case Converter

Convert text between UPPER, lower, Title, camelCase, snake_case and more

JSON ↔ CSV Converter

Convert between JSON and CSV formats instantly

Number Base Converter

Convert between binary, octal, decimal, hex and any base

YAML ↔ JSON Converter

Convert between YAML and JSON formats instantly

HTML ↔ Markdown Converter

Convert between HTML and Markdown instantly

Generators & Testers

Password Generator

Generate strong random passwords

UUID Generator

Generate v4 UUIDs instantly

Lorem Ipsum Generator

Generate placeholder text instantly

Regex Tester

Test and debug regular expressions live

Cron Expression Builder

Build cron expressions visually with human-readable preview

QR Code Generator

Generate QR codes from text, URLs and more

Code Screenshot

Create beautiful code screenshots for social media

Inspectors & Utilities

Timestamp Converter

Convert Unix timestamps to human dates

Word Counter

Count words, characters and lines

JWT Decoder

Decode and inspect JSON Web Tokens

SHA Checksum

Calculate SHA-1, SHA-256, SHA-384 and SHA-512 checksums

Text Diff / Compare

Compare two texts and see differences highlighted

Frequently Asked Questions

Are these developer tools really free?

Yes. All 27 tools are completely free with no usage limits, no premium tier, and no account required. We fund the site through non-intrusive ads.

Is my data safe? Do you store anything?

Every tool runs entirely in your browser using client-side JavaScript. Your JSON, tokens, passwords, code, and every other input stays on your device. Nothing is sent to our servers — ever. Open your browser's DevTools Network tab to verify.

Can I use these tools offline?

The tools require an initial page load, but all processing happens locally. Once loaded, most tools work without further network requests. Your data is processed by your own browser's JavaScript engine.