I built 81 free browser-based tools in vanilla JS — no login, no server, no BS

#opensource #javascript #webdev #showdev

A few months ago I got tired of googling "free JSON formatter"
and landing on sites that want my email, show 4 popups, and
probably log everything I paste.

So I built my own.

What I built

FreeToolHub — 81 browser-based tools that run entirely
on your device.

👉 https://freetoolhub.app

No login. No server. No data collection. Just open and use.

What's inside

Developer tools

JSON Formatter, Validator, Minifier
Regex Tester with live highlighting
JWT Decoder
Base64 Encode/Decode
Hash Generator (MD5, SHA-256, SHA-512)
UUID Generator
Unix Timestamp Converter
And 12 more...

Finance calculators

EMI Calculator with amortization schedule
GST Calculator (Indian tax slabs)
SIP, FD, RD, Compound Interest
Salary Converter

Text utilities, SEO tools, Image tools — 40+ more

Tech stack

Pure vanilla JS. No React, no framework.

Single main.js file registers all 81 tools using a simple
pattern:

T('dev', 'json-formatter', 'JSON Formatter', 
  'Beautify, minify & sort JSON.', 
  mount => { /* render function */ });

Each tool is a render function that gets a DOM mount point.
The router reads the URL and calls the right function.

Why no framework?

Zero build step
Instant load — no JS bundle to parse
Works offline after first load
Deploying is just git push

What I learned

Vanilla JS is underrated — for tool sites, it's faster and simpler than any framework
Browser APIs are powerful — Canvas, Web Crypto, FileReader, Web Speech — all used without any library
SEO for JS sites is hard — still working on this

What's next

More India-specific tools
PWA support
Google AdSense (once traffic picks up)

Would love feedback — broken tools, missing features,
anything that feels off.

freetoolhub.app — try it, it's free forever.

DEV Community