Making a picture saved from a website into a PDF
Save a picture from most websites today and what lands on your device is likely a WebP. Sites use the format because it is small and loads fast, but plenty of document programs, older photo viewers and upload forms still do not accept it. A PDF hands the picture to someone whose software never learned WebP, and it comes with two surprises worth knowing first: the file grows, and some pictures lose their motion.
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Which tool you need
Product shots, recipes or diagrams saved from websites
WebP to PDF. Each picture becomes one page, opened by your browser, which already reads WebP.
The whole web page, not one picture on it
Use your browser's own Print command and choose to save as a PDF. That keeps the page's words as text, which a saved picture of it would not.
A PDF several times larger than the pictures were
Compress PDF on the result, which can trade some of that extra size back.
WebP pictures mixed with JPG, PNG or HEIC
Image to PDF takes all of those in one batch, where this page takes WebP only.
An animated WebP where a later frame is the one that matters
Take a screenshot while that frame is showing and use Screenshot to PDF instead, since only the opening frame of an animation reaches a page here.
Why the PDF is bigger than the WebP
Most WebP pictures on the web are lossy: the encoder discarded detail the eye was unlikely to miss, which is how they got small. A PDF has no way to hold WebP data, so each picture is decoded and stored as a lossless PNG, and storing a photograph losslessly takes far more room than the lossy original did.
The picture gets no sharper in the process; it is kept exactly as your browser displayed it, with nothing further lost. If the size matters more than that guarantee, compressing the finished PDF is the place to make the trade.
Transparency and animation
WebP can carry see-through areas, as PNG can. Those stay see-through in the PDF, and because a page is white wherever nothing is drawn, a cut-out picture sits on white.
An animated WebP, the kind many sites use in place of a GIF, is a run of frames, and a page holds one. The first frame is the one kept, which for many animations is a title card or an empty opening.
What to know before you start
- WebP only on this page; any other format is left out with a note saying so.
- Animated pictures keep their first frame and nothing after it.
- Expect the PDF to be larger, often much larger, than lossy WebP files that went in.
- No words are read out of the pictures.