Compress Images Online
Compress image files in JPG, PNG and WebP format without changing the format. Results are measured, not estimated.
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How it works
Add JPG, PNG or WebP files
Drop up to 30 images onto the box, or click it to choose them.
Set the quality
Quality applies to JPG and WebP. PNG files are re-saved losslessly.
Download the smaller files
Each result shows its saving. Save them one by one or as a ZIP.
How to compress an image
Add your files, choose a quality and press Compress. A JPG stays a JPG, a PNG stays a PNG and a WebP stays a WebP, so you can drop the result straight into your site or document. The tool shows the size before and after for every file.
What happens to each format
| Format | Method | What to expect |
|---|---|---|
| JPG | Re-encoded at your quality | Good savings on photos |
| PNG | Re-saved losslessly | Smaller savings. Convert to WebP for more |
| WebP | Re-encoded at your quality | Good savings |
Which format should I choose?
Use JPG for photos that need wide compatibility, PNG for graphics that need exact pixels or transparency, and WebP for the smallest files on a website. To switch formats while shrinking, use the Convert Image or Image to WebP.
Already optimised files
When a file cannot get smaller, the original is kept and labelled. Nothing is made larger.
Tips to reduce image size
- Resize large images before compressing. A 4000 pixel photo shown at 800 pixels wastes bytes.
- Pick the right format for the image type.
- Avoid repeated compression of the same JPG, which stacks quality loss.
- Keep a full-quality original for future edits.
Why compress an image?
Large pictures slow down web pages, fill up storage and take longer to send. When you compress an image, you reduce its file size so pages load faster and email attachments stay within limits. This matters most on mobile connections, where every extra megabyte costs time.
How much can you compress an image?
It depends on the content. Photos usually have the most room to shrink, while flat graphics and screenshots may already be small. Moving the quality slider from 100% to around 80% often removes a large share of the bytes with little visible change, but the only reliable answer is the measured size shown for your own files.
Frequently Asked Questions
Does compression change the image size in pixels?
No. Only the file size changes. Use the Resize Image tool for dimensions.
Why did my PNG barely shrink?
PNG is lossless, so there is less to remove. Converting to WebP saves much more.
How much quality will I lose?
At 75 to 80% most photos look the same. You can compare the result before you download it.
Can I compress different formats together?
Yes. JPG, PNG and WebP files can be added in the same batch.
Is my data private?
Yes. Files are processed in your browser only.