Convert an image

JPG is the safe default for pictures and the format every upload form accepts. It has no transparency, and every save re-compresses, so it is a poor choice for anything you will edit again.

PNG is lossless and keeps transparency. Right for logos, screenshots, diagrams and anything that will be edited or annotated repeatedly. Usually much larger than the equivalent JPG, because it is not throwing detail away.

WebP is what to use when the file is going onto a website: typically 25–35% smaller than a JPG that looks the same, and it keeps transparency, which JPG cannot. Every current browser displays it. Some older desktop software and some print shops still do not accept it, which is whyWebP to JPG exists at all.

HEIC is what an iPhone saves by default. Image KB Reducer can read it but never writes it, because HEIC is not an option in browsers and is not what anything else is asking for. Drop a HEIC into the generic converter and pick JPG, PNG or WebP on the way out.

JPG has no alpha channel. Converting a transparent PNG or WebP to JPG without handling that first turns every see-through pixel black — the single most common complaint about online converters, and the reason a logo comes back with a dark box around it.

Both of the JPG-output converters here composite the image onto a solid colour before encoding, and let you pick that colour. It defaults to white, because that is what a form, a document and a printed page expect behind a transparent logo or signature.

Use the generic converter. It reads the source format from the file's own bytes rather than trusting the extension, and the target list only ever offers formats this browser can genuinely produce — so it will not offer you a conversion and then fail at the last step. If you are unsure what a file actually is, Image Info will tell you.

No conversion here uploads anything. Your image never leaves your device — the privacy policy shows you how to confirm that in DevTools.