JPG · PNG · WEBP · NO UPLOAD
Compress Images Without Uploading Them
Drop a photo and see the smaller file straight away, side by side with the original. The format stays the same unless you change it, so a JPG comes back as a JPG.
Choose a JPG, PNG or WebP image, or several at once.
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- No upload
- No sign-up
- No watermark
- No daily limit
- Works offline
How to compress an image
Drop or open your image
Drag a JPG, PNG or WebP onto the page, paste one with Ctrl+V (⌘V on a Mac), or tap Open image. Drop two or more files and they open as a batch.
Check the compare view
The new size and the percentage saved appear at once. Hold the Compare chip, or drag the split line, to see the original and the compressed result next to each other.
Save, copy or share
Save the file, copy it as a PNG, or share it from your phone. A batch saves as a zip, or straight into a folder in browsers that allow it.
FEATURES
What this page does
Before and after compare
The right side of the split view is the compressed file decoded back, so you judge the real result, not a preview. Zoom to 100% or 200% to look for blocky edges.
Same format by default
JPG stays JPG, PNG stays PNG and WebP stays WebP. Upload forms, email attachments and older apps keep working with the file you send them.
Extra small mode
Turn on Extra small to use slower, stronger encoders: MozJPEG for JPG and OxiPNG for PNG. They take longer and usually save a little more.
Batch compression
Open a folder or a few hundred photos, set one quality, and compress them all. A summary shows the total before and after, and failed files can be retried.
Lossy or lossless: what compressing actually changes
JPG and lossy WebP get smaller by throwing away detail your eyes are least likely to miss: fine texture in shadows, tiny color shifts, sensor noise. The quality setting decides how much goes. For most photos, a quality around 70 to 85 is hard to tell from the original at normal viewing size, while the file is often a fraction of what a camera saves.
PNG is lossless. Every pixel comes back exactly as it went in, so compressing a PNG means packing the same pixels more tightly. Savings are smaller and depend on the picture: flat screenshots and diagrams pack well, while photos saved as PNG stay large however hard the encoder tries.
Each time a JPG is opened and saved again, a little more detail is lost. Image Studio works from your original and encodes it once, so a second try at a different quality starts from the original again, not from the last result.
When a different format is the better compression
Sometimes the format is the problem, not the quality. A photo saved as PNG can shrink a lot just by becoming a JPG, and a screenshot full of text often looks worse as a JPG than as a PNG of the same size.
- Photos for a website: WebP is usually smaller than JPG at the same look, and every current browser shows it.
- Photos for email, forms and older software: keep JPG. Some upload forms still reject WebP.
- Screenshots, logos and anything with sharp text: keep PNG, or try lossless WebP.
- Anything with a transparent background: PNG or WebP. JPG has no transparency and fills it with a solid color.
Is it really private?
Compression runs in a worker inside this tab. The encoders are part of the page’s own files, so your photo is read from your disk, encoded in memory and handed straight back to you.
There is no account and no history on our side, because there is no server copy to keep. Closing the tab clears the job.
You don't have to take our word for it. Three checks:
- Open your browser's developer tools, choose the Network tab, then open and save an image. No request carries your file.
- Open an image here once, then turn on airplane mode and run the same job again. It still works, because nothing needs a server.
- Read the page's response headers: its Content-Security-Policy lets it connect only to this site itself, so there is no outside host a file could go to.
Reference
| Opens | JPG, PNG, WebP, AVIF, GIF (first frame), BMP, ICO, SVG and TIFF. HEIC opens in Safari. |
|---|---|
| Saves | The same format, or JPG, PNG or WebP |
| Metadata | Removed by default when an image is re-encoded, GPS location included |
| Quality | Adjustable for JPG and WebP. PNG compression is lossless. |
| Batch | Many files or a whole folder. Saved as a zip, or into a folder in Chrome and Edge. |
| Browsers | Chrome, Edge, Firefox and Safari on computers and phones |
Frequently asked questions
How much smaller will my image get?
It depends on the image. Photos straight from a phone camera often shrink a lot, because cameras save at a high quality. Images that were already compressed for the web shrink less. The compare view shows the exact new size before you save, so you never have to guess.
Will compressing reduce the quality?
For JPG and WebP, a little detail is removed; at the default quality most people can’t see it at normal size. Zoom the compare view to 200% to check edges and fine texture. PNG compression is lossless, so the pixels stay exactly the same.
Why is my PNG barely smaller?
PNG keeps every pixel, so there is a limit to how far it can shrink. If the image is a photo, saving it as JPG or WebP usually makes it far smaller. If it is a screenshot with text, PNG is often still the right choice.
Does it change the image size in pixels?
No. Compress keeps the width and height. If you also want fewer pixels, open More options and set a longest side, or use the resize tool, which does both in one pass.
Can I compress many photos at once?
Yes. Open several files or a folder and they appear as a batch with one shared setting. Each file shows its new size, and the whole batch saves as a zip, or straight into a folder in Chrome and Edge.
What happens to the photo’s metadata?
When an image is re-encoded, its EXIF data, including any GPS location, is removed by default. The picture is already turned the right way up before saving, so it still displays correctly.