⇄Image Format Converter

WebP for almost everything on the web now. Support is effectively universal in current browsers, and it produces noticeably smaller files than JPEG at the same visual quality — often a quarter smaller or better.

JPEG remains the safe choice where maximum compatibility matters: email clients, older software, anything going into a print workflow.

PNG is for transparency and hard edges — logos, screenshots, diagrams, anything containing text.

The mistake worth avoiding

Saving photographs as PNG. The file comes out several times larger with no visible benefit, because PNG compression is designed for flat areas of colour rather than continuous tone. A photograph is the worst case for it.

The reverse is also true and less obvious: saving a screenshot as JPEG produces visible artefacts around text — that smeared halo you see around lettering in a badly saved screenshot is exactly this.

Quality settings

Around 80 is a good balance for JPEG and WebP. Above 90 the file grows quickly for differences most people cannot see on a screen.

Converting does not recover quality

A JPEG converted to PNG does not become sharper. It stores the already-compressed result losslessly, usually at a much larger size — you have kept the artefacts and lost the compression. Whatever earlier encoding discarded is gone.

If a file gets bigger after conversion, this is almost always what happened.

Transparency

WebP supports it, so it works for logos as well as photographs and there is rarely a reason to keep a PNG version alongside.

Everything is processed locally — the image is never uploaded.