Image Resizer
Resize images to any dimension
100% free. Runs entirely in your browser - your files and data never leave your device and nothing is uploaded to any server.
Facebook post selected — upload an image to apply it.
Drag & drop files here
or browse to upload
Supports PNG, JPG, WebP up to 20MB
Processed in your browser - your file never leaves this device.
About this tool
1200 x 630 pixels is what Facebook Post needs: landscape, 40:21, 0.8 megapixels. Upload anything and it comes back cropped to fit. The same 1.91:1 shape Facebook uses for link previews, so one image covers both. The same shape Facebook uses for link previews, which is why an OG image and a feed post can be the same export. The image never leaves your computer - the resize runs in the browser, which also means there is no queue and no file-size cap. Feeding in a different aspect ratio means something gets cut. The preview shows exactly what, so you can reposition instead of discovering it after posting.
How to use this tool
- Drop your image inAny JPG, PNG or WebP. Nothing is uploaded - your browser reads the file directly.
- It resizes to 1200 x 630 pixelsThe Facebook Post preset is already selected on this page, so there is nothing to type in.
- Check the preview and downloadThe preview shows the exact crop. Reposition if you need to, then save as JPG, PNG or WebP.
Key features
- Export as JPG, PNG or WebP, whichever the platform prefers.
- Runs in your browser - no upload, no account, no watermark.
- Resizes to exactly 1200 x 630 pixels, the current Facebook Post size.
- No limit on how many images you resize.
- Live preview, so you see the crop before downloading instead of after.
Common uses
- Getting a correctly sized image without opening a full editor for a 30-second job.
- Resizing on a phone without installing an editing app.
- Preparing a batch at 1200 x 630 pixels before a scheduled post.
- Sharing an image to a page or feed.
- Fixing an image a platform rejected for being the wrong dimensions.
Tips for better results
- Crop to 40:21 before resizing when the subject matters - then you choose what is lost rather than the tool.
- Check the result on the platform itself - feed thumbnails are often cropped again from the size you upload.
- Start from the largest original you have. Scaling up to 1200 x 630 pixels from something smaller looks soft, and nothing undoes that.
- The same shape Facebook uses for link previews, which is why an OG image and a feed post can be the same export.
Mistakes to avoid
- Assuming another platform at the same pixel size behaves identically. The same shape Facebook uses for link previews, which is why an OG image and a feed post can be the same export.
- Scaling a small image up to hit the pixel count. The file gets bigger; the detail does not come back.
- Putting important detail near the edges of a 40:21 frame. Platforms crop again for thumbnails and previews.
- Re-saving the same JPG over and over. Each save loses a little more detail, permanently.
Frequently asked questions
1200 x 630 pixels - a landscape 40:21 frame, 0.8 megapixels.
Drop it onto this page. The Facebook Post preset is already selected, so it resizes straight to 1200 x 630 pixels and shows the crop before you download.
Yes - free, no signup, no watermark and no limit on how many images you resize. It runs in your browser, so it costs nothing to provide.
Yes. It runs in the browser, so it works on iPhone and Android as well as desktop, with no app to install.
No. It keeps the 40:21 ratio and shows what will be cropped, so you can reposition before downloading rather than finding a bad crop afterwards.
No. The resize uses your own device image engine, so files never leave your computer.
The same shape Facebook uses for link previews, which is why an OG image and a feed post can be the same export.
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