Formats
The choice depends on what is on the page
The formats are not better and worse; they suit two different kinds of content.
Photographs
JPG compresses colour gradients efficiently, so the file comes out noticeably lighter with a visual difference hardly anyone notices.
Text and lines
PNG keeps hard edges. A text page exported as JPG shows faint noise around the letters when enlarged.
When you do not want an image at all
If the point is the text rather than its shape, exporting plain text suits better than any image format — and it stays searchable.
Where this one runs
- Runs the page tools entirely in your browser: those files are never uploaded
Part of these tools run in the browser and part on the server, where the result waits sixty minutes.