Free Online Tool
Image Compressor
Re-encode an image in your browser and compare the original and compressed file sizes.
Original / Compressed Comparison
Processing Result
The result will appear here.
Selected images are not uploaded to a server and are processed only in your browser.
When to Use This Tool
- Make images lighter before uploading to blogs or stores
- Reduce slow-loading JPG, PNG, or WebP files
- Keep dimensions while adjusting quality and file size
Choosing a Quality Value
For JPG and WebP, lower quality can reduce file size but may remove detail. PNG compression behaves differently depending on whether the image is a photo, logo, icon, or screenshot.
How to Use
- Select an image to compress.
- Adjust the quality value from 10 to 100.
- Compare the original and compressed result side by side.
- Use Fit, 100%, zoom in, and zoom out to inspect the same area in both previews.
- Drag the zoomed preview to compare text, edges, and texture artifacts.
- Check the saved size and reduction rate, then download the compressed image.
Examples
- Reduce JPG size before uploading
- Re-compress a WebP image at lower quality
Choosing an Image Quality
These ranges are starting points for review, not guaranteed file-size or quality targets. Results vary with the image and browser encoder.
| Quality range | What to check |
|---|---|
| 90 and above | For photos where preserving the original appearance matters. Inspect fine details at a larger zoom. |
| 80-89 | A practical range to compare size and appearance for web uploads. |
| 70-79 | Prioritizes smaller files. Check text, edges, and gradients closely. |
Use this tool when dimensions should stay the same. Resize first when pixel dimensions also need to be reduced.
When the original dimensions are much larger than needed, use the Image Resizer first, then compress the result.
Calculation and Conversion Notes
Image compression uses the image encoding methods supported by the browser and adjusts the quality value. JPG and WebP generally use the quality setting, while PNG quality support can be limited depending on the browser implementation. Selected images are not uploaded to a server.
How to Check the Result
Do not judge only by file size. Zoom the original and compressed previews to the same scale and position, then check text, faces, and edges. If artifacts are visible, increase the quality value.
Limits
Already-compressed images may not shrink much. If transparency is required, use PNG or WebP instead of JPG.
FAQ
What changes when I lower quality?
The file may become smaller, but artifacts can appear around text, edges, and dark areas.
Why does PNG sometimes shrink very little?
PNG compression depends heavily on image content. Photos with many colors may be smaller as JPG or WebP.
Does compression resize the image?
Compression mainly changes storage quality or format. Use the image resizer to change pixel dimensions.
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