Free tool
Image compressor
Drop your images in and they start compressing straight away, on your own device. Check any image against its original before you download it.
How to use the image compressor
- Drop your images on the page, paste one, or click to choose them. Compression starts on its own, and each image shows its progress in the list.
- Click Check on any image to compare it with the original. Drag the slider across the picture, and use Actual size to look closely.
- If an image needs more quality or could go smaller, change its quality or format there. Only that image is compressed again.
- Download images one by one, or click Download all for a ZIP.
Choosing the settings
Quality applies to every image. Balanced suits most photos. Smaller gives up some detail for a much lighter file, and Best keeps more detail. Each image can be changed on its own afterwards.
Format stays the same as the original unless you change it. WebP and AVIF are usually much smaller than JPEG and PNG, and current browsers show them, but some older apps cannot open them.
Keep each image under is optional. The compressor looks for the best quality that stays under the size you enter, and tells you when an image cannot reach it. It never changes the width or height. To change those, use the image resizer.
PNG images
PNG is lossless, so compressing one keeps every pixel exactly the same and removes only wasted data. That saves less than compressing a photo, and quality and size targets do not apply. If a PNG is still too heavy, switch it to WebP, which also keeps transparency and is usually far smaller.
When a file does not get smaller
An image that is already well compressed may not shrink. If the result in the same format would be the same size or larger, you keep your original file, marked Already compact. If you choose a different format and the result is larger, the list says so, so you can decide.
Limits
- Up to 50 images at a time, each up to 60 MB.
- JPEG, PNG, WebP and AVIF. HEIC photos from iPhones work only in browsers that can read them, such as Safari, and they become JPEG.
- GIFs are not supported, because animation would be lost.
- Compressed files leave out metadata such as camera details and location.
- Colours are converted for normal screens, so wide-colour photos may look slightly less saturated.
Frequently asked questions
Something else? contact@getoxtro.com
Are my images uploaded anywhere?
No. Your images are compressed on your own device, by code running in your browser, and never reach our server. If you accept analytics in the cookie banner, we count how many images were compressed, but never their names or contents.
Is it really free?
Yes. There is no account, no watermark, and you can use the files commercially.
How much smaller will my images get?
It depends on the image and how it was saved before. A photo straight from a camera or phone usually shrinks a lot. An image already compressed for the web may barely change.
Does compressing reduce quality?
JPEG, WebP and AVIF compression removes detail that is hard to see, and more of it at lower settings. Compare each image with its original before you use it. PNG compression removes no detail.
Can I compress an image to a specific size, like 100 KB?
Yes. Enter 100 in Keep each image under. If an image cannot reach that size at the lowest quality, it is still made and marked as over target. Then a smaller width and height, from the image resizer, is the way to get there.
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