Convert AVIF to PDF

AVIF is a delivery format for web pages. Sites serve it because it is the smallest thing every current browser reads, and saving a picture from such a page hands you a format nobody on your computer asked for.

The consequence is familiar: the photo viewer refuses it, the email client will not preview it, the print service rejects the upload, and the colleague you sent it to asks what it is. Nothing is wrong with the file — the software outside the browser has simply not followed.

It depends on where the picture is going, and both answers are legitimate. If the destination expects an image — a photo library, an editor, an upload form asking for a picture — then JPG or PNG is the more natural conversion and this is the wrong page.

PDF is right when the destination expects a document. An email attachment somebody will open and print. A form that accepts PDFs and nothing else. A filing system. A print shop. In those cases wrapping the image in a document removes every question about what the recipient can open, because the answer is everybody.

The picture is written into the PDF without a further lossy pass, so the document holds exactly the pixels the AVIF held. No second round of compression, no resampling, no softening of edges.

What it cannot do is undo what already happened. An AVIF served by a website has been compressed to be small, sometimes aggressively, and that compression is in the picture now. Converting changes the container faithfully; it does not restore detail the site chose not to send.

Fitting the page to the image is the right default for anything that will be looked at on a screen — no white border, no letterboxing, and no decision about paper for a file nobody will print.

A4 or US Letter is right when the PDF is going to be printed or filed alongside other paper-sized documents. The image is then centred on the sheet, and it is scaled down if it does not fit but never scaled up: enlarging a small web image onto a full page would turn a sharp picture into a soft one, and a modest picture centred on a page is the honest result.

Setting a margin adds space around the picture. On the default page size it grows the page; on A4 it reduces the room the image is given.

It is worth using when the document is going to a printer, since most printers cannot put ink right to the edge of a sheet and will otherwise crop into the picture. For anything staying on a screen, leave it at zero — a margin on an attachment is white space the recipient scrolls past.

AVIF carries a full alpha channel, and the transparency is preserved in the conversion. But a PDF page is white underneath, so what you see when the document opens is the picture sitting on white.

For most images that is exactly right. The case where it bites is a light-coloured graphic designed to sit on a dark background, which disappears against the page. If that is what you have, place it on its intended colour before converting rather than afterwards.

The decoding happens in your browser rather than in the operating system, which is the useful part on a machine that cannot display the format at all. If double-clicking the file does nothing, this still works — the browser is the one piece of software that definitely reads it.

And nothing is uploaded. The conversion runs on your own processor, so there is no account, no queue and no daily allowance, and a folder of saved images converts in a single pass with the results returned as one ZIP.