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.
A4 @ 300dpi 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
2480 x 3508 pixels is what A4 at 300 DPI needs: portrait, 620:877, 8.7 megapixels. Upload anything and it comes back cropped to fit. A4 at 300 DPI is the standard for print. Anything less and the result looks soft on paper even though it looked fine on screen. 300 DPI is the print standard. At 150 the result looks fine on screen and visibly soft on paper, which is the usual way this goes wrong. The image never leaves your computer - the resize runs in the browser, which also means there is no queue and no file-size cap. If your source is a different shape, the tool shows what will be cropped rather than silently squashing it. A 620:877 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 2480 x 3508 pixelsThe A4 at 300 DPI 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
- Resizes to exactly 2480 x 3508 pixels, the current A4 at 300 DPI size.
- No limit on how many images you resize.
- 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.
Common uses
- Fixing an image a platform rejected for being the wrong dimensions.
- 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 2480 x 3508 pixels before a scheduled post.
- Preparing an image for print at full A4.
Tips for better results
- Crop to 620:877 before resizing when the subject matters - then you choose what is lost rather than the tool.
- Save as JPG rather than PNG at this size. A PNG photograph here can be several times larger for no visible gain.
- 300 DPI is the print standard. At 150 the result looks fine on screen and visibly soft on paper, which is the usual way this goes wrong.
- Start from the largest original you have. Scaling up to 2480 x 3508 pixels from something smaller looks soft, and nothing undoes that.
Mistakes to avoid
- Putting important detail near the edges of a 620:877 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.
- Scaling a small image up to hit the pixel count. The file gets bigger; the detail does not come back.
Frequently asked questions
2480 x 3508 pixels - a portrait 620:877 frame, 8.7 megapixels.
Drop it onto this page. The A4 at 300 DPI preset is already selected, so it resizes straight to 2480 x 3508 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.
300 DPI is the print standard. At 150 the result looks fine on screen and visibly soft on paper, which is the usual way this goes wrong.
Yes. It runs in the browser, so it works on iPhone and Android as well as desktop, with no app to install.
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 620:877 ratio and shows what will be cropped, so you can reposition before downloading rather than finding a bad crop afterwards.
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