Social Media Image Resizer — 9 Platform Sizes, All Local

How to use

1. Load an image (PNG or JPG, stays local).
2. Wait for the nine presets to render with real KB sizes.
3. Download individual sizes or press Download all.
4. Upload each file where it belongs.

About this tool

Every platform wants a different pixel size, so stop exporting nine times from your editor. Load one image and this tool center-crops it — cover-fit, so nothing is stretched — into nine ready-to-post sizes: Instagram square and portrait, Story/Reels, X post, X header, YouTube thumbnail, LinkedIn post, Facebook cover and a 400×400 profile picture. Each target is rendered on its own canvas and encoded as JPEG at quality 0.9, with the actual output size in kilobytes shown beside every download button, because platforms like YouTube enforce real byte limits. Download presets one at a time or grab all nine in one sequence. Everything is computed on your device from the file you pick. Your file never leaves this page — processing runs entirely in your browser; nothing is uploaded and the data is dropped from memory when you close the tab.

FAQ

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Your rating stays in this browser (local storage) — nothing is sent to any server.