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Compress images online

Runs in your browser — this file is never uploaded

Shrink photos and screenshots so they fit an upload limit, load faster on a website, or send by email. Add your images, choose how hard to compress, and download them back.

Your files never leave your device. Compression runs entirely in your browser, so nothing is uploaded, stored, or scanned — which also means there is no queue and no limit on how many you do.

One thing worth knowing before you start: how much an image shrinks depends on what kind of image it is. Photographs have enormous amounts of detail the eye does not miss, and compress dramatically. PNG screenshots and logos are already stored losslessly, and the real win for those is changing format rather than turning quality down. We tell you which one you have.

or drop them here — nothing is uploaded

How to compress image

  1. Add your images

    Drop JPG, PNG, or WebP files into the box, or click to browse. You can do a batch at once.

  2. Choose how hard to compress

    Balanced is a good default for photographs. Light keeps more detail for images you will look at closely, and Strong goes further when size matters more than fine detail.

  3. Compress and download

    Press Compress Image. A single file downloads on its own; several arrive as a ZIP. You will see exactly how much was saved, including when the honest answer is "not much".

Frequently asked questions

Are my images uploaded anywhere?

No. Compression runs in your browser using JavaScript, so your files stay on your device. You can confirm this by opening your browser devtools Network tab while compressing — there are no upload requests.

Why did my PNG barely get smaller?

Because PNG is a lossless format that is already packed tightly, and a browser cannot repack it any better. Turning quality down does nothing for a PNG — the setting has no effect on it at all. The change that does work is converting to WebP, which is usually dramatically smaller at the same visual quality, and which every current browser displays. Set the output format to WebP and try again.

What's the difference between Light, Balanced, and Strong?

They set how much detail the encoder is allowed to discard. Light keeps almost everything and typically saves a third on a photograph. Balanced saves considerably more and is very hard to tell apart from the original at normal viewing size. Strong goes further again and can show visible softness or blocking in flat areas like skies. None of them changes the pixel dimensions of your image — for that, use the resize tool.

Should I convert my images to WebP?

For anything going on a website, almost certainly yes — WebP files are typically 25–35% smaller than an equivalent JPG and far smaller than a PNG, and every browser in current use supports it. The one reason to stay with JPG is compatibility with older software: some desktop applications, printers, and photo frames still do not read WebP.

What happens to transparent areas?

JPG has no way to store transparency, so if you convert a transparent PNG to JPG the see-through parts are filled with white — and we say so in the result rather than letting you discover it later. WebP does support transparency, so converting to WebP keeps it intact. That makes WebP the right choice for logos and cut-out images.

Will compressing the same image twice make it smaller again?

It will make it worse, not smaller. Lossy compression discards detail permanently, so a second pass throws away detail from an already-degraded image and adds artefacts of its own. Always compress from the original file rather than from a result you compressed earlier.

What if the compressed file comes out larger?

We give you the original back instead, and tell you. Some images are already optimally packed, and re-encoding them can add bytes rather than remove them. Handing you a bigger file and calling it compression would be dishonest.

Why do some tools claim bigger savings than this?

Usually because they run dedicated encoders like MozJPEG or OxiPNG on a server, which do beat a browser — by roughly a fifth on JPG, and genuinely so on PNG. The trade is that your photos have to be uploaded to a stranger, and the page has to download a megabyte of extra code before it can do anything. For the files most people bring here, choosing the right format closes most of that gap for free.

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