/01 Converting between image formats
Convert between PNG, JPEG, WebP, JXL, GIF, BMP, TIFF, ICO and ICNS, with resizing along the way. All of it runs in your browser — the images are never uploaded, which is the main reason to avoid the usual online converters.
Batch several files through the same settings when you need a consistent set.
/02 Choosing the right format
JPEG suits photographs and loses detail permanently each time it is re-encoded. PNG is lossless and supports transparency, which makes it right for logos, screenshots and line art but wasteful for photographs. WebP does both jobs at smaller sizes and is supported everywhere that matters now.
JPEG XL compresses better still and can re-encode existing JPEGs losslessly, though browser support is not yet universal. ICO and ICNS exist for Windows and macOS icons respectively. The rule that matters: never convert a lossy format to another lossy format repeatedly, because the damage accumulates.
/03 Converting PNG to JPG, and when not to
PNG is lossless and supports transparency, which makes it perfect for logos and screenshots and wasteful for photographs. A phone photo saved as PNG can easily be several times larger than the same picture as a JPG at high quality, with no difference you can see. That is the job a PNG to JPG converter does best: shrinking photos for email, upload forms and websites.
Two things change on the way. JPG has no transparency, so any see-through areas are filled with a solid colour, which you choose in the JPEG options so it matches where the image will sit. And JPG compression softens sharp edges, which is why text, icons and interface screenshots can pick up faint smudges. For those images, stay with PNG or use WebP, which handles both photos and sharp graphics at small sizes.
/04 Converting a whole folder of images at once
Drop in as many images as you like and they are all converted to the target format in one go. Set the quality for lossy formats, choose whether to keep transparency, and optionally set a width or height to resize everything on the way. When the batch finishes, download images one at a time or all together as a ZIP.
The conversion happens inside your browser, so there is no upload queue, no daily limit and no file size cap from a server. The only limit is your own device's memory, and your photos never leave it.