HEIC is decoded by the browser itself, because no permissively licensed decoder exists. Safari on Apple devices reads it; other browsers refuse the file and say so rather than guessing. If yours refuses, save the photos as JPEG on the device and use JPG to PDF.

Page size

Match each imageFrom fileEvery page takes the size of the picture on it. Nothing is cropped and no white bars appear.A4210 × 297 mmStandard paper outside North America.US Letter216 × 279 mmStandard paper in North America.US Legal216 × 356 mmLonger than Letter, used for contracts in the United States.A3297 × 420 mmTwice the area of A4. Suits plans, posters and wide tables.

Orientation

AutomaticPer pageEach page follows the shape of its own content.PortraitTallEvery page is taller than it is wide.LandscapeWideEvery page is wider than it is tall.

Orientation follows each image while the page size comes from the file.

Margins

None0 mmContent runs to the edge of the page.Printable margin12.7 mmHalf an inch on every edge, which desk printers can reach.

Each page is the size of its own image, so nothing is scaled or cropped.

Advanced

One PDF for all imagesLosslessTurned off, every image becomes its own PDF and you get one file per picture.

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