Compress images online — stop down, don't give up quality.
Drop in a JPG, PNG, or WebP photo, close the aperture, and out comes a smaller file — compressed and resized entirely on your device, with no upload and no sign-up.
How this online image compressor works
In a camera, stopping down means closing the aperture to let in less light — you trade a bit of brightness for a sharper, more controlled exposure. This image compressor works on the same trade-off, just with file size instead of light.
When you move the dial toward f/22, the compressor discards image data the eye barely notices — subtle color gradients and fine texture — to shrink the file. Toward f/1.4, it keeps nearly everything, so the file stays close to its original size.
Everything happens with your browser's built-in canvas engine, so it works as a JPG compressor, a PNG compressor, or a WebP compressor without ever sending the photo anywhere. There's no upload wait, no file size limit imposed by a server, and nothing to worry about on the privacy side.
How to compress an image online
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Load a photo
Drop a JPEG, PNG, or WebP file into the frame, or click it to browse your device.
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Set the aperture
Drag the dial. Lower f‑numbers preserve detail; higher f‑numbers shrink the file further.
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Check the numbers
Original size, compressed size, and the percentage saved update as you adjust.
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Save the print
Choose JPG, PNG, or WebP and download the compressed version — ready to upload, email, or attach.
Smaller files, fewer headaches
Most phone photos run 3–8 MB, far larger than the web actually needs. A compressed version at a fraction of that size still looks sharp on a screen, loads faster on a slow connection, clears email attachment limits, and takes up less space in whatever form or upload field you're fighting with.
It also matters for anyone publishing online: page speed affects how search engines rank a site, and large, unoptimized images are one of the most common causes of a slow page.
Common reasons people compress images here
- —Shrinking a photo below a job application's or visa form's upload limit
- —Reducing image size for a website without losing visible quality
- —Getting a photo under an email attachment size limit
- —Resizing and compressing a photo for WhatsApp or a messaging app
- —Converting a PNG screenshot to a smaller JPG or WebP
- —Hitting an exact target file size — like 200 KB — for a form field
Frequently asked
Is my photo uploaded anywhere?
No. The compression runs locally in your browser using the canvas API. The file never touches a server.
What formats are supported?
JPEG, PNG, and WebP files can be loaded, and you can choose any of the three as your output format using the chips below the upload frame. JPEG and WebP compress photographic images the most; PNG stays lossless and larger.
Will transparency be kept?
Only if you export as PNG or WebP — both support transparency. Exporting as JPEG fills transparent areas with white, since JPEG has no transparency channel.
Can I resize an image or hit a specific file size?
Yes — below the aperture dial you can set a width and height, and a target file size in KB or MB. The compressor searches for the quality setting that lands closest to it.
Is there a file size or resolution limit?
No hard limit — very large images just take a moment longer to process since everything runs on your device's own processor.