Compress images without uploading them

Frequently asked questions

Are my images uploaded anywhere?

No. Compression runs entirely in your browser, in a background worker, and your images never leave your device. Most of it works with the internet off once the page has loaded. The AVIF encoder, the PNG optimiser and the iPhone (HEIC) decoder are small helper files downloaded from this site the first time you use them; if you are offline at that moment you are told so.

How do I get an image under 200 KB?

Choose “To a file size”, enter the size in KB and every image is squeezed to fit. Quality is lowered first; if that is not enough, the picture is made smaller too, and the row tells you when that happened or when a target could not be reached. Images already under the limit are left at full quality.

How much smaller will my images get?

It depends on the image and the setting. Photographs saved as JPG, WebP or AVIF commonly drop by half or more at about 75% quality, and AVIF is usually smallest. An image that is already well compressed may not shrink; when a re-encode in the same format comes out no smaller and you did not resize, you get your original back (with photo details removed) and the row says so. If you convert to another format and it comes out bigger, the row says that too instead of hiding it.

Can PNG files really be made smaller?

Yes, in two ways. “Lossless” re-packs the PNG with an optimiser (oxipng) and changes no pixel, which usually saves a modest amount. “Reduce colours” also limits the picture to a smaller palette, which often shrinks screenshots, logos and graphics by 60 to 80 percent with little visible change; the quality slider sets how many colours are kept. Photographs are usually much smaller as JPG, WebP or AVIF, and the page suggests WebP when a PNG has no transparency.

What happens to my photo's location and camera details?

They are removed, and a badge on the row says so (“Location data removed” when a GPS location was found). If you turn on “Keep photo details”, the EXIF block is copied into JPG results, including the location, so use it only for photos you are not going to share. Details can only be kept when a JPG stays a JPG.

Which formats are supported?

You can add JPG, PNG, WebP, AVIF, GIF, BMP and iPhone HEIC photos. Output can be the same format or JPG, WebP, AVIF or PNG. A GIF or BMP kept in its own format becomes a PNG if it has transparency and a JPG if it does not, and the file is named accordingly.

Is there a limit on how many images I can compress?

No artificial limit. Images are processed one after another on your device, so the ceiling is your device's memory: up to 25 MB per file, and pictures beyond what the browser can hold (about 100 megapixels) are scaled down with a message. There is no account, no watermark and no daily cap.