Image Compressor
Free online image compressor for JPEG, PNG, and WebP. Convert to WebP or AVIF, compare before and after, and download a batch as a ZIP. Runs in your browser, no upload.
What this tool does
This free online image compressor shrinks JPG, PNG, and WebP files in your browser, with optional conversion to WebP or AVIF when you want the smallest possible result. Nothing is uploaded: the image is decoded and re-encoded on your own device, and a side-by-side before/after slider shows exactly what changed before you download.
Add up to 10 images (50 MB each), compare the result, and download them individually or as a ZIP. Free, no account, no watermark.
How it works
- Add your images (JPG, PNG, or WebP, up to 10 files, 50 MB each).
- Pick an output format and quality, or leave the defaults.
- Drag the before/after slider to check the result, then download individually or as a ZIP.
Supported formats
| Supported formats | JPG, JPEG, PNG, WEBP |
|---|---|
| MIME | image/jpeg, image/png, image/webp |
| Max file size | 52.4 MB |
When to use it
Faster websites
A page full of multi-megabyte photos loads slowly and ranks worse. WebP output typically cuts a photo by half or more with no visible change.
Email and form limits
Portals that reject attachments over 2 or 5 MB stop being a problem when you can see the new size before downloading.
Freeing up phone storage
A camera roll of JPGs converts to WebP in one batch, and the before/after check means you only keep the copies that look right.
Compression you can see before you keep
The tool re-encodes your image at the quality you pick. Higher quality keeps more detail and saves less space; lower quality does the opposite. The drag slider exists because a percentage saved means nothing without seeing the picture, so the comparison is built in rather than left to hope.
Format choice matters as much as the slider. JPG to WebP is usually the biggest win for photos, and the tool recommends it for that reason. PNG output stays lossless: pixels are untouched, which also means PNG files rarely get much smaller. If the file is already well compressed, the tool says so honestly instead of returning a file that is the same size with a new name.
Everything runs on your device. The images never leave the browser, so this is safe for scans of documents, screenshots with personal details, or anything else you would rather not upload.
Frequently asked questions
How much smaller will my image get?
It depends on the source. An iPhone JPG usually shrinks 40 to 70 percent when converted to WebP at default quality. A PNG screenshot converts to JPG or WebP at a fraction of its size. An image that was already compressed well may not shrink at all, and the tool tells you that instead of pretending.
Are my images uploaded to a server?
No. Your browser decodes and re-encodes the image locally. You could disconnect from the internet after the page loads and it would still work.
Which output format should I choose?
WebP for the best size-to-quality balance in browsers and most apps. AVIF compresses further but encodes slower and support is still uneven (it is marked beta here). Same as source keeps the original format when compatibility matters more than size.
Is this image compressor free?
Yes. Free, no account, no watermark, no daily cap.
Does compressing lose quality?
JPG, WebP, and AVIF are lossy formats, so some detail is traded for size. At the default quality the difference is not visible in normal use, and the before/after slider lets you verify with your own eyes before you keep anything. PNG output is lossless.
How many images can I compress at once?
Up to 10 files per batch, each up to 50 MB. Run the tool again for more.
Related tools
Privacy
Your file never leaves your device.
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