Compress Image
Reduce JPG, PNG and WebP file size in your browser. No upload, no watermark, no signup.
Drop your image here
or click to browse
Processed locally — never uploaded
How to use compress image
- 1Add your image
Drag a file onto the panel or click it to browse. JPG, PNG and WebP are all supported.
- 2Set the quality
Around 75 percent is a good starting point for photographs. Go lower for email attachments, higher for images you intend to print.
- 3Download the result
Original and compressed sizes are shown side by side so you can see the saving before you save anything.
About compress image
Image compressor reduces the file size of a picture while keeping it perfectly usable at full size. It is the tool you reach for when an email refuses to send, a website rejects an upload, or a form tells you the file must be under a specific number of kilobytes.
Everything happens inside your browser. The image is decoded, redrawn and re-encoded by JavaScript on your own device, then handed straight back to you. Nothing is uploaded, which means there is no file size limit, no queue to wait in, and no third party holding a copy of your photos.
Most photographs can lose 60 to 80 percent of their file size before any difference is visible at normal viewing size. Screenshots and flat graphics compress far less well, because they contain large areas of identical colour where there is little detail to discard. If a file refuses to get smaller no matter how far you turn the quality dial down, converting it to WebP or JPEG will usually help more than lowering the quality further.
Frequently asked questions
Is there a limit on how large a file I can compress?
No. Because the work happens on your device rather than on a server, there is no upload limit at all. Very large images may simply take a few seconds longer, since your own hardware is doing the processing.
Will compressing my image make it look bad?
Not at the default setting. At 75 percent quality most photographs are visually identical to the original at normal size. Turn the slider down towards 10 percent and you will start to see artefacts around hard edges and in smooth skies.
Are my images uploaded anywhere?
No. The file is read by your browser, redrawn on your own device and downloaded again. It never reaches our server and we hold no copy of it.
Can I compress a PNG without losing transparency?
Yes, as long as you keep the output format as PNG. Switching to JPEG or WebP will flatten any transparent areas to a solid colour.
Does it add a watermark?
No. The downloaded file is the clean, recompressed image with nothing stamped on it.
Which output format should I choose?
Keep the original for general use. Choose JPEG for photographs where small size matters, PNG for graphics with transparency, and WebP for the smallest file at good quality on the web.
Related tools
Private by design. Your files are processed on this device and are never uploaded to the 1xmobcas.com server. Use compress image offline with total confidence.