Image Resize

1. Choose one image. Drag and drop a JPG, PNG, or WebP file onto the box, or select one from your device. A preview appears, and its original width and height fill in the width and height fields automatically.
2. Set the width and height you want, in pixels. Leave Keep aspect ratio on to fit your image inside that box without distorting it, or turn it off to force the exact size you entered.
3. Choose an output format — the same format as your input, or convert to JPG, PNG, or WebP — and a quality setting if you picked JPG or WebP. Set an output name, or leave it blank for an automatic one based on the original file name.
4. Select Download resized image. The image is read, resized, and re-encoded in your browser in the selected format, and the result downloads immediately — nothing is uploaded anywhere.

What Image Resize does: it changes the width and height of a single JPG, PNG, or WebP image, entirely on your device. It does not crop, rotate, retouch, watermark, or compress beyond what the chosen output format and quality setting already do.

Processed locally in your browser. No file upload is required for this tool — the image you select is read, resized, and re-encoded on your own device, and the result downloads without ever leaving it.

Image size and quality. With Keep aspect ratio on, your width and height describe a box the image is scaled to fit inside, without cropping or distortion. With it off, the output is exactly the size you entered, which can distort the image if its proportions differ from your target. Making an image larger than its original size always reduces effective quality, and a warning appears when this happens. Resizing itself, and re-encoding at a JPG or WebP quality setting, can also reduce image quality — always verify the final output before publishing, printing, filing, or sending.

Transparency and JPG backgrounds. JPG has no transparency channel. If your source image has transparent areas and you convert it to JPG, those areas are filled with a white background before the image is drawn, and a warning tells you this happened. PNG and WebP keep transparency as-is.

File size and browser limits. An image can be up to 25 MB, and up to 40 megapixels once decoded — both the file itself and the requested output are checked. Very large images, or images with very large pixel dimensions, may fail because of browser memory limits; this is a stated limit for a tool that runs entirely on your device, not a server. Output can also differ slightly between browsers, because browser image encoders vary — verify the result in the browser your audience will actually use if that matters for your case. WebP output depends on your browser supporting it; where it doesn't, the tool falls back to PNG and says so.

Common errors. A specific, plain-English message explains exactly what went wrong: no image selected, a file that isn't a JPG, PNG, or WebP, a file over the size limit, an image over the pixel limit, an invalid or missing width or height, requested output dimensions that are too large, an image file that can't be read, or a resize that failed to complete. Do not use this tool for images you are not allowed to process.