Which format to use in each case
- JPG: photos to share, with a good balance between quality and size.
- PNG: logos, screenshots and graphics with transparency. It keeps sharp edges, although photos tend to be heavy.
- WebP and AVIF: images for websites. They're usually lighter than JPG at similar quality.
- PDF: to send an image as a document.
- ICO: icons for a website or app, up to 256 pixels.
- TIFF and BMP: systems or programs that require them. They're large because they're saved uncompressed here.
How to reduce size without it showing
Start with 80% quality and compare the result. If the image will be shown small, also reduce its maximum size: it usually saves more than lowering quality. If a platform sets a limit, use the maximum file size option in JPG, PNG or WebP and the tool will look for a result close to it.
iPhone HEIC photos
Many iPhones save photos in HEIC, a format some programs and websites don't accept. You can open them here and convert them to JPG to use them anywhere.
Frequently asked questions
Can I convert several images at once?
Yes. Choose several images and, when they're ready, download them one by one or all together in a ZIP file.
What happens with an animated GIF?
If you convert it to another format, only the first frame is kept. With the “Same format” option, the file is kept unchanged.
Why is the file sometimes larger?
It happens when you convert to a format that doesn't compress as much, like TIFF or BMP, or when the original was already highly optimized.
Are my images uploaded to a server?
No. Everything is processed in your browser, so the real limit depends on your device's memory.