How it works
Each HEIC is decoded with the open-source heic2any library, converted to a 92%-quality JPEG, then embedded into a PDF page sized to the photo's exact dimensions using pdf-lib.
FAQ
What is HEIC and why does my iPhone use it? HEIC (High Efficiency Image Container) is the default photo format on iPhones since iOS 11. It produces files about half the size of JPEG at the same quality, but most non-Apple software does not read it natively — hence the need for a converter.
Can I convert several HEIC photos into one PDF? Yes — drop multiple HEIC files and they will each become a page in the output PDF, in the order you added them.
Will the photo lose quality? The HEIC is decoded once to JPEG at 92% quality, then embedded into the PDF without further re-encoding. The result is visually indistinguishable from the original at normal viewing sizes.