Image Compressor
Re-encode an image as JPEG or WebP in the browser and compare the resulting size and appearance. Pixel dimensions stay unchanged, making this useful for testing delivery copies of a photograph.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
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How to use this tool
Select a file, output format and quality from 0.1 to 1. JPEG output composites transparent regions against white, so inspect the background before choosing it for a transparent graphic.
Results and examples
Try quality 0.8 and 0.5 on the same photograph, then compare bytes and fine text edges. A lower setting does not guarantee a file smaller than the original; use the measured output size.
Limitations
- The conversion does not preserve all metadata or animation frames.
- Compression effectiveness depends on image content and the browser’s encoder.
Fields
| Field | Guidance and constraints |
|---|---|
| Image file | Check the unit and format displayed beside this field. |
| Output format | Check the unit and format displayed beside this field. |
| Quality ( 0.8 ) | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
How should I choose quality?
Try quality 0.8 and 0.5 on the same photograph, then compare bytes and fine text edges. A lower setting does not guarantee a file smaller than the original; use the measured output size.
Will every output be smaller?
The conversion does not preserve all metadata or animation frames. Compression effectiveness depends on image content and the browser’s encoder.
