Image Conversion

Convert image formats between different types.

Usage

1. Drop an image onto the box above, or click it to choose a file.
2. Optionally, adjust the quality of JPEG and WEBP images. The default of 92% is what browsers use themselves: it looks the same as 100%, but the files are much smaller.
3. Optionally, reduce the number of colours of PNG images. PNG is lossless, so this is the way to make it smaller.
4. Optionally, change the size: enter a width or height, or pick one of the percentages. While the chain button is active, the other side follows to keep the aspect ratio.
5. Each download button shows the size of the converted image and how it compares to the original. Click the one for the format you want to save it.

If you keep the format and the size, and converting would make the file larger, you get the original file instead.

Converting re-encodes the image, which also removes metadata like the camera model or the location a photo was taken.

Why can the converted image be larger?

Converting decodes the image and encodes it again. Whatever the original's compression already removed is gone for good, so it can't be saved a second time. Worse, the small artifacts that compression left behind are detail for the new encoder, which then spends space on keeping them. Browsers also encode for speed rather than for the smallest file, while images on the web are often made with slower tools that compress harder.

This is why converting a small, well compressed image often makes it larger, while a large photo straight from a camera usually gets much smaller. Lower the quality, reduce the PNG colours or the size to get smaller files.

Privacy

This tool runs entirely in your browser and does not send any data to a server.

Something not working as expected? Let me know.