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KioTools
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  • Runs locally

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Image Converter

Convert images between PNG, JPEG, WebP, GIF, BMP and more — HEIC photos included.

Image Cropper

Crop images to a custom or fixed aspect ratio.

Image Blur & Redact

Blur, pixelate or black out regions of an image.

Image Compressor & Resizer

What is this tool?

Image Compressor & Resizer is a client-side tool that reduces a photo's file size by adjusting compression quality and, optionally, its pixel dimensions. It's built for quickly preparing images for web pages, email, or upload forms that have file size restrictions.

When to use it

  • Shrinking a photo so it fits under an email attachment or form upload limit
  • Resizing product photos to consistent dimensions for a website or store listing
  • Reducing image file size to speed up a web page's load time
  • Preparing a smaller version of a high-resolution camera photo for online sharing
  • Batch-shrinking screenshots or images before adding them to a document

How to use it

  1. 1Open the Image Compressor & Resizer and upload your photo.
  2. 2Set a target quality level or file size for compression.
  3. 3Optionally enter new width/height dimensions to resize the image.
  4. 4Preview the estimated output file size and quality.
  5. 5Apply the changes.
  6. 6Download the compressed and/or resized image.

Frequently asked questions

Will compressing my photo make it blurry?

Some quality loss is possible at higher compression levels, but the tool lets you preview the result and adjust the quality setting to find a good balance between size and clarity.

Can I resize and compress in the same step?

Yes, you can set new dimensions and a compression level together before downloading the result.

What image formats does this support?

The tool works with common photo formats such as JPEG and PNG.

Is there a limit to how much I can compress a file?

There's no artificial limit in the tool, though extremely aggressive compression will noticeably reduce image quality.

Do I need to upload my photo to a server?

No, all compression and resizing happens locally in your browser.