47 free AI tools that live in your browser (2026)

#opensource #productivitytopensourceools

I built 47 small AI helpers that run entirely in your browser. No signup. No upload. No tracking. They live at Korelyy ? a tool garden I've been curating for the past few months.

Here's why I went this route, and what's in there.

Why browser-only?

Every AI tool I tried wanted the same three things: my email, my files, and my patience. So I started porting the ones I actually use to plain HTML + vanilla JS. They run offline, they never phone home, and they cost me nothing to host.

What's in the box

Writing & text (8 tools)

Character counter that shows platform limits (X / LinkedIn / Meta)
Case converter (Title / sentence / camelCase)
Whitespace cleaner
Markdown previewer
Lorem generator
Typographic quotes fixer
Diff checker (side-by-side)
Text statistics (readability + grade level)

Image & files (11 tools)

Image converter (PNG / JPG / WebP)
Image to PDF
PDF to images
Image resizer (aspect-ratio aware)
Image cropper
EXIF stripper
SVG optimizer
Favicon generator (16/32/180/192/512)
QR code generator
Barcode generator
HEIC to JPG

Calculators & life (12 tools)

Life weeks (how many Saturdays left)
Life progress bar
Sleep cycle calculator
Tip calculator
Loan calculator
Compound interest
Age in days
Date diff
Working days calculator
BMI
Calorie estimator
Random picker

Dev helpers (9 tools)

JSON formatter / validator
JWT decoder
UUID generator
Hash (MD5/SHA-1/SHA-256)
Base64 encoder/decoder
URL encoder
Color picker (with contrast checker)
CSS unit converter
HTML entity encoder

AI / productivity (7 tools)

Emoji mixer (combine any two)
Tone rewriter (formal / casual / friendly)
Meeting agenda template
Standup notes generator
Daily planner
Pomodoro timer
Habit tracker

Total: 47.

How they're built

100% client-side. The server only ships static files.
No analytics, no cookies, no third-party calls.
Most are under 300 lines of vanilla JS.

A note on "free"

There's no catch, no upsell, no "premium" tier hidden behind a paywall. The whole point was building things I would use myself. If a tool saves you five minutes a week, that's the deal.