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Compress Image to 400 KB

Get a JPG, PNG or WebP under 400 KB with the best quality that fits. Files stay on your device.

Drop images here, click to choose, or paste
JPG, PNG, WebP, AVIF, HEIC, GIF, BMP. Up to 100 files. Stays in your browser.

Everything runs in your browser. Your images are not sent to our server. Sizes are shown with 1 KB = 1,000 bytes.

Compress an image to 400 KB

A 400 KB limit covers scanned documents saved as JPG, forum and chat attachments and mid-size web images.

The target is already set to 400 KB. The tool tries the highest quality first and lowers it step by step until the file fits. It shrinks the pixel size only when quality alone cannot get under the limit. It aims slightly below 400 KB, counting 1 KB as 1,000 bytes, so the file also passes on systems that count 1,024 bytes.

What fits in 400 KB

As a JPG or WebP, a typical photo of about 1,600 by 1,200 to 2,200 by 1,400 pixels fits in 400 KB. Screenshots, logos and scans of text behave differently: flat colors compress very well, and fine texture or noise compresses poorly. If the file cannot reach 400 KB at a reasonable size, the list tells you and shows the smallest result.

Tips for reaching 400 KB

  • For scans of text, grayscale JPG at moderate quality is much smaller than a color scan. Scan in black and white if the original allows.
  • Photos taken at night or with a lot of grain are harder to compress and may need smaller pixel dimensions.
  • Compress from your original file. Compressing a copy that was already compressed loses more detail.

Other sizes

20 KB, 50 KB, 75 KB, 100 KB, 150 KB, 200 KB, 250 KB, 300 KB, 500 KB, 750 KB, 1 MB, 2 MB, 3 MB, 5 MB.

You can also compress JPG, PNG or WebP by format, or read the image compression guide.

Frequently asked questions

How do I compress an image to 400 KB?

Add the image. The target is already 400 KB, so the tool finds the highest quality that fits and shows the result. Download it when it looks right.

Will the image still look good at 400 KB?

Usually yes for the sizes listed on this page. If the original has far more pixels than 400 KB can hold, the tool reduces them too, so a very large photo may look smaller but not blocky.

Why are some photos harder to compress to 400 KB?

Noise and fine texture, such as foliage, grain or a night shot, cost many bytes. Smooth areas such as sky or a plain wall cost very few.

What happens if my image is already under 400 KB?

Nothing is changed. The tool keeps your original file when it already fits and no resize is requested.