Compress photos and images

How to use the Image Compressor

1. Drop in the photos or screenshots you want to send.
2. Keep quality at 75 for a good balance, or go lower when the size limit is tight.
3. For the biggest cut, set a maximum width or height under More settings.
4. Compress, check the savings listed under each file, and download.

Getting under attachment limits

Email services commonly cap attachments around 20–25 MB, and a handful of full-resolution phone photos can pass that on their own. Recompressing JPGs at quality 75 often removes a third or more of the size; resizing a 12-megapixel photo to 2000 pixels wide usually brings it under 1 MB.

Resizing is where most of the saving comes from, because the file size scales with the pixel count. Halving both width and height leaves a quarter of the pixels.

What happens to each format

JPG pictures go through MozJPEG, WebP through libwebp and AVIF through libavif, re-encoded at the quality you set. The Effort slider under More settings trades time for size, which matters most for PNG and AVIF.

PNG is lossless, so instead of lowering quality the file is recompressed with OxiPNG, which searches for a tighter way to store exactly the same pixels. Screenshots straight from a phone often drop by a fifth or more this way.

Mixed batches and lossy PNG

A folder from a phone or a screen recorder often mixes JPG photos with PNG screenshots. Drop it in as it is: every file keeps its own format and gets the matching encoder, and the size column reports the result per file.

For PNG screenshots, ticking Reduce PNG colours under More settings switches to a palette of up to 256 colours. That usually cuts them by half or more while keeping transparency; leave it off when every pixel must stay exact.

Questions