Resize an Image for Open Graph / Link Preview
1200 × 630 pixels — the exact size Open Graph / Link Preview expects.
The dimensions
1200 × 630 pixels, an aspect ratio of about 1.90:1. The de facto standard for link unfurling, honoured by most chat apps, social platforms and messaging clients.
Crop, and what you will lose
Most platforms take the 1.91:1 crop; those that use a square variant crop from the centre, so keep the subject near the middle.
Getting the right image to appear
A preview card is built from the page's og:image meta tag, not from the first image in the article. If you change the image at the same URL, most scraper caches keep serving the old one — Slack, Facebook, LinkedIn and X all cache previews, and the usual fix is to point og:image at a new filename rather than to wait for the cache to expire. Square-only placements crop the 1.91:1 file from the centre, so the subject belongs in the middle third.
How to crop it here
Selecting cover scales your image uniformly until it fills the 1200 × 630 rectangle, then trims the overflow from the centre. Contain would leave empty bands instead, which is wrong for an image meant to fill a frame, and stretch would distort faces.
Why this runs in your browser
The file is read from your disk by the browser, decoded with the browser's own codecs, and re-encoded in this tab. No upload request is made, nothing is queued on a server, and closing the tab leaves no copy anywhere. You can verify this in the network panel while it works.
How to use it
- Drop the image on the drop zone.
- Choose the Open Graph / Link Preview preset, or type 1200 and 630 directly.
- Set cover mode so the frame is filled without distortion.
- Check the crop keeps the subject centred, then download.
Worth knowing
- Target dimensions are 1200 × 630 pixels, ratio 1.90:1.
- Used for link preview cards.
- Cover fills the frame and crops the overflow; contain letterboxes instead.
- Aspect ratio is preserved in every mode except stretch.
Limitations
- Cropping is from the centre — frame the photo before uploading if the subject is off-centre.
- Upscaling beyond the original size adds no detail.
- Very small sources will look soft at 1200 pixels wide.
- Platforms change their internal dimensions without notice; these are current published figures.