112 Free Online Developer Tools That Run in Your Browser (No Signup)

I got tired of developer tools that want an account, a credit card, or a pile of ads before they'll format ten lines of JSON. So I built my own set and put them in one place. There are 112 of them, they are free, and none of them needs a signup.

Here is what's inside, grouped by the job you're usually doing.

Formatters and validators (45 tools)

This is the biggest group. Paste messy code, get clean code back.

• JSON Formatter and Validator: beautify and validate JSON with syntax highlighting
• JSON Diff: compare two JSON documents and see what changed
• JSON Tree Viewer: explore big JSON as a collapsible tree
• CSS, HTML, JavaScript, C#, Java, Go, GraphQL and CSV formatters

Encoding and security (18 tools)

• JWT Decoder: read the header and payload of a token
• Bcrypt Generator: hash a test password
• Base64, hex, binary and HTML encoders and decoders

Network and DNS (10 tools)

• DNS Lookup and DNS Propagation: check whether your DNS change has spread
• Email Auth Checker: check your email authentication records
• IP Lookup

Image tools (12 tools)

• Image Compressor, Image Resizer and Image Converter
• EXIF Viewer: see what metadata your photos carry

Everyday developer utilities (11 tools)

• Cron Expression Generator: build a schedule without guessing
• CHMOD Calculator
• HTTP Status Codes reference
• .gitignore Generator

Why bother?

Every tool here exists because the alternative was too bloated, too expensive, or hidden behind a paywall. The whole collection lives on one page: debasisbhattacharjee.com/tools

Which tool do you keep reaching for that I should add next? Tell me in the comments and I'll look at building it.