Why I built this
Every time I needed a quick JSON formatter or a UUID generator,
I'd Google it and land on some ad-heavy site that barely worked
on mobile. So I decided to build my own.
Six months later, FreeToolkit has 100+ tools and I learned a
lot along the way.
What I built
FreeToolkit is a free collection of
browser-based utilities for developers. No login, no ads,
no data sent to any server.
Some of the most useful ones:
- JSON Formatter & Validator — paste messy JSON, get clean output
- JWT Decoder — decode any JWT token instantly
- Regex Tester — test regex with live match highlighting
- UUID Generator — v4 UUIDs with one click
- Hash Generator — MD5, SHA1, SHA256, SHA512, bcrypt
- Color Converter — hex, RGB, HSL, CMYK
- SQL Formatter — clean up messy queries instantly
What I learned building 100+ tools
1. Scope creep is real
I started with 10 tools. Each one suggested 3 more.
Set a limit early.
2. Browser APIs are powerful
90% of these tools need zero server. Crypto, encoding,
parsing — all native now.
3. SEO for tools is different
Each tool page needs its own content. "JSON Formatter"
as a page title isn't enough.
4. Performance matters more than features
Users close tabs in 3 seconds if the tool is slow.
What's next
I'm planning to add:
- API access for some tools
- Browser extension
- More language-specific tools
Would love feedback — what tools do you wish existed?
Check it out at freetoolkit.co
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