Resize one photo for every platform

How Social Image Resizer works

Links, UTMs and previews are assembled as text from what you typed. Nothing is shortened through a redirect service and no click is recorded. A campaign link built here points straight at your destination, with no third party in the middle to expire or count it.

That is the whole architecture: static files, one script, no upload endpoint to leak or log. Close the tab and the work is gone.

Where those numbers come from

1080 × 1080 for a square post, 1080 × 1920 for a story, 1200 × 630 for a Facebook link, 1600 × 900 for X, 1200 × 627 for LinkedIn, 1280 × 720 for a YouTube thumbnail, 1000 × 1500 for a pin. Each platform publishes a recommended size and then compresses whatever you upload, so the useful rule is to export at or slightly above the recommended width and let the platform scale down. Upscaling never adds detail.

The aspect ratio matters more than the pixel count. A 4:5 portrait fills more of a phone screen than a square, which is why Instagram favours it, while a 1.91:1 landscape is what a link preview expects. Cropping to the right ratio is the actual job; the pixels are bookkeeping.

Fill or fit, and what it costs

Fill scales the photo until it covers the frame and then crops the overflow. Nothing is left blank, but the edges are gone — fine for a portrait, fatal for a screenshot with text near the border. Fit scales the photo until it is fully visible and pads the rest with a colour you choose. Everything survives, at the cost of visible bands on two sides.

The tool shows the result as a real thumbnail before you commit, because the choice depends on the picture, not on a rule.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions