Email and attachment prep
Use it when a file is too heavy to send comfortably but still needs to look good enough for review.
Free Image Compressor Online
Compress images locally in your browser and compare file sizes before downloading.
Files and text are processed locally in your browser. No upload. No signup.
Supports JPG, PNG and WebP. Limit: 10 files, 10 MB each.
Choose up to 10 images to compress in your browser.
How to use
- 1 Select JPG, PNG or WebP files from your device.
- 2 Choose the output format and compression quality.
- 3 Compare file sizes and download the compressed results.
Features
- Supports batch compression for up to 10 files.
- Shows original and compressed file sizes.
- Lets you switch between JPEG, PNG and WebP output.
- Processes files locally in your browser.
Common use cases
Making attachments easier to send
Shrinking website images before publishing
Reducing file size without leaving the browser
Example input and output
Original file
Compress a photo before sending
team-photo.jpg — 4.2 MB
Compressed result
Result you can copy or download
team-photo.jpg — 1.3 MB
Compression is most helpful when the dimensions are already acceptable and the main problem is file weight.
When this tool is the right fit
Pre-publish optimization
It helps reduce asset weight before you upload images into a CMS, product page or landing page.
Quick batch cleanup
Good for one-off folders of screenshots or photos that all need smaller outputs without a full editing workflow.
Quick comparison
| If you need | Best choice | Alternative | Why |
|---|---|---|---|
| Smaller file size with minimal workflow changes | Image Compressor | Image Resizer | Compression keeps the same basic dimensions while shrinking the output size. |
| Much smaller dimensions too | Image Resizer | Image Compressor | Resize first when the original is far larger than the final display slot. |
| Modern publish format for PNG assets | PNG to WebP | Image Compressor | Format conversion can outperform generic compression for some website graphics. |
Best format choice
When to use it
You want the smallest practical file for photos
Start with JPEG or WebP and compare the result.
When to use it
You need transparency or crisp graphic edges
PNG may still be the better output despite the larger size.
Common mistakes
- Lowering quality too far before checking whether resizing would solve the size problem first.
- Switching every file to PNG and expecting it to compress like a photo format.
- Replacing the original source before checking the output at the size people will actually see.
FAQ
Does compression reduce image quality?
Compression can reduce quality depending on the format and quality setting you choose.
Can I compare the size before and after compression?
Yes. The tool shows the original and output sizes for each result.
Can I compress several images together?
Yes. Batch compression is supported up to the browser-safe limit.
What compression ratio can I expect?
Results vary by image. Photos often compress 30-50% with minimal visible change.
Does the tool support lossless compression?
The tool uses quality-based compression. Lower quality gives smaller files with more visible change.