ResCal

ResCal

Scale any resolution to fit any box — free, in-browser

Free resolution scaler that runs entirely in your browser. Pick a source WxH and a target box, choose fit / fill / stretch, or scale by percentage. Standard resolution ladders, social-media size presets, and a check whether a source fits without upscaling. No upload, no signup.

Development · Design Tools

Features

- Fit / fill / stretch modes into any target box

- Scale by percentage with pixel-count output

- Standard resolution ladders (4K to small)

- Social-media size presets

- "Will it fit" upscaling sanity check

- 100% local — nothing is uploaded

Use Cases

- Fit a screenshot or wallpaper into an exact slot without distortion math

- Build responsive image ladders and encoding ladders for video

- Check social-media export sizes before uploading

- Decide between fit and fill and see the letterbox difference

- Verify a source can be placed without upscaling

Commune

A shared home for builders to launch, connect, and grow

Comments

chenzefeng09

Built ResCal because fit-vs-fill math kept tripping me up — it computes the honest answer (including letterbox bars) entirely in your browser. Free, no upload, no signup.

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