Which format should I choose?

WebP for the web, since it is smaller than both at equal quality and every current browser reads it. JPEG for maximum compatibility with older software. PNG when you need transparency or exact pixels, such as screenshots and logos.

Are my photos uploaded anywhere?

The file is read into memory by your own browser and processed there, so it is never uploaded and never reaches a server. That holds for a batch of a hundred as much as for one.

Image Converter

Convert between PNG, JPEG, WebP and BMP with adjustable quality. Crop and resize on the way through, one image or a whole batch.

Drop images here

PNG, JPEG, WebP, GIF, AVIF or BMP · up to 50 MB each

Formats are encoded by your browser, so the exact output matches what it renders.

About this tool

Converts between PNG, JPEG, WebP and BMP, with control over quality, size and cropping, and handles a whole batch at once. WebP typically saves 25 to 35 percent over JPEG at the same visual quality, which is usually the reason people arrive here.

How to use it

1Drop one image or a hundred.
2Choose the output format, and the quality if the format is lossy.
3Optionally cap the longest edge to shrink large photos, or crop a single image.
4Convert, then download them one at a time or all together.

Good to know

BMP is written by hand

No browser implements toBlob for image/bmp, so the site carries its own 24-bit BMP writer. Since BMP at that depth has no alpha channel, transparent pixels are composited onto the background colour you pick.

Orientation is respected

Photos from phones carry an EXIF orientation flag that a naive canvas conversion silently discards, turning portraits sideways. Images are decoded with that flag applied.

Quality does nothing for PNG

PNG and BMP store every pixel exactly, so the quality slider is disabled for them rather than pretending to do something.