The format your phone picked, in a format everyone accepts
HEIC exists for good reasons: it stores the same picture in roughly half the space of JPG. The trouble starts the moment the photo leaves the phone. Upload portals reject the extension, Windows asks for a codec, and the person waiting on your signed lease cannot open the file at all.
Converting to PDF solves it in one step, and it suits what these photos usually are. Most HEIC files that need converting are pictures of paper: a contract, a receipt, an ID, a meter reading. Those belong in a document, not a photo library.
Common uses
- Photographed contracts sent on for signature.
- Receipts gathered into one file for an expense claim.
- Multi page documents shot page by page and reassembled in order.
- Upload forms that accept PDF and nothing else.
Once the photos are a PDF, Sign PDF places a signature on them and OCR PDF adds a searchable text layer so the words can be found later. If you only wanted usable images, HEIC to JPG runs entirely in your browser and never uploads the files.