Image to PDF

Use it whenever you need to ship images as a single document:

• Scanned paperwork — combine phone photos of a multi-page receipt, contract or ID into one PDF.
• Portfolios & briefs — bundle screenshots or photos for a client without forcing them to download a ZIP.
• Form upload requirements — many government / banking portals only accept PDF; converting locally avoids uploading IDs to a random web tool.
• Printing — PDF prints predictably across browsers and OSes; a folder of images often does not.

Pick the layout that fits the destination:

• A4 — global standard. Use for documents heading to office printers outside North America.
• US Letter — North-American standard. Slightly shorter and wider than A4.
• Fit to image — each page is sized to its image exactly, with no margin. Best for image-first PDFs (portfolios, comics) where any whitespace would look wrong.

For A4 / Letter, pick portrait or landscape to match your image shape. Margin is in points (1 pt = 1/72 inch); 0 = edge-to-edge, 36 ≈ ½ inch, 72 = 1 inch.

When an image's aspect ratio doesn't match the page (every time you mix portrait and landscape photos, for example), the tool needs a rule for how to fit it:

• Contain — shrinks the image until the entire image fits inside the content area. The full image is visible; whitespace appears on the two sides that don't match. Safe default for documents.
• Cover — scales the image up until it fully covers the content area, cropping whatever overflows. No whitespace, but you lose part of the image. Use for photo-book–style output.

If every image already matches the page aspect ratio, the two modes produce identical output.

Images are decoded by the browser's image pipeline (the same code that paints <img> tags) and the resulting bytes are handed to a Web Worker, where pdf-lib assembles the document. Nothing ever crosses the network. Once you close the tab, the in-memory copies are gone.

If you'd rather not even keep the result in memory longer than needed, click the Download button as soon as the PDF appears and then refresh.