aspect ratio calculator — free browser tool | fatcousin | fatcousin

tools→browse every utility in one place.manifesto→why fatcousin exists — local-first, no uploads.

ready

local

// fatcousin · local process monitor

00:00:00

// session started —

// tool · aspect-ratio-calc

// origin · —

// user agent · —

// verdict · files processed locally · verify by watching NET events below

▮

NET · no outbound requests · all processing local

this panel shows everything. if something looks wrong, it is wrong. that's the contract.

detect ratio · find missing dimension · common ratios · runs locally

[detect ratio from dimensions]

width (px)

height (px)

16:91.7778:1

[find missing dimension]

ratio W		ratio H
solve for
known width

height720px→ 1280 × 720

[common ratios]

16:9	HD / Full HD / 4K · YouTube · TV
4:3	Standard TV · old monitors
1:1	Instagram posts · square
3:2	35mm film · DSLR
21:9	Ultrawide cinema / monitor
9:16	TikTok · Reels · vertical video
2.39:1	Anamorphic cinema
1.85:1	Standard cinema flat

[status]

>ready