KiiMix Compress Images Online for Free
Reduce image file size for free. Adjust JPEG quality in your browser, process up to 12 images at once and export JPEG without uploading files.
How to use
- 1Select or drop up to 12 images, no larger than 20 MiB each.
- 2Set the JPEG quality. The whole image is kept, with the longest edge limited to 6000px.
- 3Start processing, check the file sizes, and download the results. Transparent backgrounds become white.
Specifications & output
Make image files smaller by adjusting JPEG quality while keeping the whole image. To remove parts of the image or change its aspect ratio, use the image cropper.
| KiiMix default output | Original framing, longest edge up to 6000px |
|---|---|
| Output format | JPEG (white background) |
| Input per file | 20 MiB |
| Batch size | 12 images |
| Quality control | 50–92% |
| Compression output | Longest edge up to 6000 px; smaller images are not enlarged |
Reduce file size while keeping detail
Keep a copy of the original. Start at the default 80% quality, then check small text, hair and edges. Lower the quality if the result still looks clear. The percentage controls JPEG quality: 80% does not mean the file will be 20% smaller.
The longest edge is limited to 6000px; smaller images keep their dimensions. Use the cropper if you need a different aspect ratio or a fixed output size.
Check transparent backgrounds and sharp edges
All results are JPEG. Transparent backgrounds become white, so keep the original PNG if you need transparency. Photos usually work well as JPEG, but screenshots, logos and thin lines can show blur or compression marks.
Frequently asked questions
Why is the result larger than the original?
An image that is already compressed can grow when saved again, especially at a high JPEG quality setting. Compare the original and output file sizes in the results list before downloading.
Can I compress to a specific KB size?
There is no setting for an exact file size yet. Lower the quality, process again and check the result. The amount of detail in the image also affects its file size.
Are my images uploaded?
No. These image tools process files in your browser. Reloading or leaving the page clears the current editing session.