AVIF is a still image saved using AV1, the video codec developed by the Alliance for Open Media. Compressing a photograph with video technology is remarkably effective — an AVIF is often noticeably smaller than the equivalent JPEG at matching quality — which is why image-heavy sites have moved to it. The cost of being new is that the software ecosystem has not caught up.
Every current browser decodes AVIF, but most desktop photo viewers, office suites and upload forms do not — support arrived years later there, if at all. Converting inside the browser works precisely because the decoder is already present and maintained. That is also why this tool needs no plugin, no install and no upload to a conversion server.
An AVIF usually reaches you as a download from a website or an export from a modern camera or design pipeline. The common next move is pasting it into some random online converter — which means uploading the image to a server you know nothing about, just to change its container format. Utilitly skips that step entirely: the AVIF is decoded and rebuilt as a PDF page inside your own browser, so there's never a copy sent anywhere to begin with.
Almost certainly, and that is the expected outcome. AVIF's whole purpose is aggressive lossy compression; the PDF stores a lossless copy of the decoded image so that no further detail is thrown away. You are exchanging a small file that little can open for a larger one that opens everywhere. Our compress PDF tool can bring the size back down if you need it to.
Add the AVIF image to the tool above, add any others you want in the same document, and download the PDF. The conversion runs in your browser and the file is never uploaded.
It is a still image compressed with AV1, the open video codec from the Alliance for Open Media. Using video compression on a photograph produces unusually small files, which is why websites have adopted the format.
AVIF is recent enough that browser support arrived long before desktop support. Photo viewers, office applications and many upload forms still reject the format even though your browser renders it without difficulty.
Almost certainly. AVIF is built for aggressive compression, whereas the PDF stores a lossless copy of the decoded image so nothing is degraded twice. If the size is a problem, compress the finished PDF.
No additional quality is lost. The compression already applied to the AVIF is permanent, and the image goes into the PDF losslessly from that point — what you see in the PDF matches what your browser shows.
Yes. Add as many as you want and each becomes its own page, in the order you arrange them.
The image never leaves your device. Decoding and PDF creation both happen in your browser, so there is no upload and no server copy.