Drop in your iPhone photos. Build a single multi-page PDF or a separate PDF per photo — with page size, orientation, margins, 1/2/4-per-page layouts, a cover page, page numbers, and compression, all in your control. No upload, nothing stored on a server.
HEIC/HEIF is Apple's default photo format on iPhone since iOS 11 — it compresses better than JPEG but isn't natively viewable in much non-Apple software, which is why converting to PDF, a universally readable format, is useful for sharing, printing, or archiving. This tool decodes each HEIC file in your browser, lays photos into pages using the size, orientation, and grid settings you choose, and assembles the result with a PDF library, including support for pulling individual frames out of Live Photos.
A small number of HEIC files use encoding variants, or are actually HEIF video containers, that browser-side decoders don't support; re-exporting as JPEG from the Photos app first works around this.
Combined mode places every photo as a page, or a grid of photos per page, inside a single PDF file. Per-photo mode outputs a separate PDF for each image, useful when you need to send or file photos individually rather than as one document.
Some loss is possible depending on the compression setting you pick — lower compression keeps more fidelity but produces a larger file, so there's a direct trade-off between file size and image quality.