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.
FB Cover 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
The Facebook Cover size is 820 x 312 pixels, a landscape 205:78 frame. Drop an image on this page and the preset is already applied - there is nothing to type in. Facebook crops the cover differently on mobile than on desktop - keep the subject centred. Facebook shows a wider crop on desktop than on mobile, so the edges of this frame are effectively decoration rather than content. Nothing is uploaded. The resize happens on your own device, so the file never reaches a server and it keeps working offline once the page has loaded. If your source is a different shape, the tool shows what will be cropped rather than silently squashing it. A 205:78 target always loses something from another ratio - seeing where is the difference between a usable result and a cut-off head.
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 820 x 312 pixelsThe Facebook Cover 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
- Live preview, so you see the crop before downloading instead of after.
- Runs in your browser - no upload, no account, no watermark.
- Export as JPG, PNG or WebP, whichever the platform prefers.
- No limit on how many images you resize.
- Resizes to exactly 820 x 312 pixels, the current Facebook Cover size.
Common uses
- Updating a page or profile cover.
- Fixing an image a platform rejected for being the wrong dimensions.
- Preparing a batch at 820 x 312 pixels before a scheduled post.
- Getting a correctly sized image without opening a full editor for a 30-second job.
- Resizing on a phone without installing an editing app.
Tips for better results
- Start from the largest original you have. Scaling up to 820 x 312 pixels from something smaller looks soft, and nothing undoes that.
- Check the result on the platform itself - feed thumbnails are often cropped again from the size you upload.
- PNG keeps text and sharp edges crisp at this size; JPG is smaller for photographs.
- Crop to 205:78 before resizing when the subject matters - then you choose what is lost rather than the tool.
Mistakes to avoid
- Assuming another platform at the same pixel size behaves identically. Facebook shows a wider crop on desktop than on mobile, so the edges of this frame are effectively decoration rather than content.
- Putting important detail near the edges of a 205:78 frame. Platforms crop again for thumbnails and previews.
- Re-saving the same JPG over and over. Each save loses a little more detail, permanently.
- Letting the image stretch instead of keeping the ratio. A squashed face is more obvious than a tight crop.
Frequently asked questions
820 x 312 pixels - a landscape 205:78 frame, 0.3 megapixels.
Drop it onto this page. The Facebook Cover preset is already selected, so it resizes straight to 820 x 312 pixels and shows the crop before you download.
Facebook shows a wider crop on desktop than on mobile, so the edges of this frame are effectively decoration rather than content.
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.
JPG for photographs, PNG when there is text or transparency, WebP when the platform accepts it and you want the smallest file.
No. It keeps the 205:78 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.
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