How to Resize an Image Without Losing Quality

To resize an image without losing quality, make it smaller rather than larger, keep its aspect ratio and save it at a high quality. In ToolistHub's free Image Compressor, choose Width and height or Percentage under Resize, keep the format, set a high quality and download. It works in your browser, so the image is not uploaded.

Smaller keeps quality, bigger can't add it

A smaller image has fewer pixels, but each one is worked out from the original, so the picture still looks sharp at its new size. Enlarging is different: the extra pixels have to be invented from the ones that exist, so an enlarged image looks softer. That is why the Image Compressor never enlarges an image unless you turn on Allow enlarging.

How to resize an image without losing quality

1. Open the Image Compressor and add the image with Choose images or by dropping it on the drop area. You can add up to 20 images.
2. Under Resize, choose Width and height. Type the width or the height in pixels and keep Keep aspect ratio on, so the image isn't stretched. Leave the other box empty to have it worked out for you.
3. Or choose Percentage, for example 50 to make the width and height half as big.
4. Keep the format: Same as original keeps JPG as JPG, PNG as PNG and WebP as WebP.
5. Set a high quality with the Quality slider under By quality. PNG is lossless, so the quality setting doesn't change PNG images.
6. Select Compress images and download the result.

Which format keeps the most quality

• PNG is lossless: it keeps every pixel exactly. It suits screenshots, logos and graphics, but a photo saved as PNG is large.
• JPG is lossy: each save drops a little detail. At a high quality the loss is small, and the file stays much smaller than a PNG of the same photo.
• WebP is also compressed and keeps transparency, but some older programs and upload forms don't accept it.

Resize to a file size instead

If a form limits the file size rather than the pixels, choose To a file size, such as 50 KB. The tool lowers the quality, but not below 40%, then reduces the width and height only if it still has to.

Frequently asked questions

Can you make an image bigger without losing quality?

Not really: enlarging has to fill in pixels that were never there, so the image looks softer. Shrinking is the safe direction.

How do I resize an image without stretching it?

Keep Keep aspect ratio on and type only the width or only the height. The other side follows the image's proportions.

Can I resize several images to the same size?

Yes. Add up to 20 images, set the width and height once, and download them together as one ZIP file.

Is my image uploaded?

No. The Image Compressor resizes images in your browser, and saved images keep no EXIF metadata such as the GPS location.

Conclusion

For sharp results, shrink images rather than enlarge them, keep the aspect ratio and save it at a high quality in the Image Compressor. For a cut-out with a transparent background, try the Background Remover, and to put resized photos into one PDF, use JPG to PDF.