iPhone photos as a PDF
iPhones and iPads save photos as HEIC, which many offices, printers and upload forms don't take. Add the HEIC files, put them in order and click Merge: every photo becomes one page of a PDF that opens anywhere.
Photos taken with the phone held sideways come out upright. HEIC photos are decoded with libheif and the pixels are stored in the PDF without loss, so nothing is compressed a second time.
Page size
Photos don't carry a real paper size, so with Same as the picture each page is about the size of a sheet of A4, with the photo filling it. Choose A4 or US Letter to print on standard paper: each photo is then centred, on a landscape page when it is wide, and the 1 cm margin option keeps it clear of the edges.
Live Photos, bursts and wide-colour photos
A HEIC file can hold more than one picture, such as a burst or an edited version next to the original. The PDF gets the file's main picture, the one the Photos app shows. Photos taken in the Display P3 colour range are converted to standard sRGB colours, so they look the same in every PDF reader. The moving part of a Live Photo is a separate video file and isn't needed.
HEIC with other files
The list also takes JPG and PNG pictures, PDFs and Word documents. A typical use: a PDF form, followed by HEIC photos of the documents it asks for, merged into the one PDF an upload form accepts. AVIF pictures work the same way.
More about what this tool reads and writes: Merge PDF.