What is HEIC and why do websites sometimes reject it?
HEIC is the high-efficiency photo format used by many iPhones. It can store a high-quality image in less space than a conventional JPEG, but older software and many upload forms accept only JPG, PNG or PDF. Converting several HEIC photos into one PDF produces a predictable document that is easier to print, email and submit.
Best settings for photographed documents
Use Maximum quality when a photo contains small printed text, signatures, stamps or numbers. Choose A4 for most international forms and US Letter for workflows that specifically require it. A narrow margin gives the image more room without placing it directly on the edge of the page.
Best settings for ordinary photos
High quality is normally enough for photographs. Auto orientation lets portrait and landscape images use the page more efficiently. Match each photo when the exact image proportions matter more than consistent paper size.
How to prepare HEIC files before conversion
- Open each image in the Photos app and correct its rotation.
- Crop away unwanted background when the photo is a document.
- Arrange the files in a folder or select them in the intended order.
- Open the HEIC to PDF tool, decode the files and drag the cards into the final order.
- Create the PDF and check every page before deleting the original photos.
When should I use Scan to PDF instead?
Use Mobile Scan Studio when the images need automatic border cropping, deskew, brightness, contrast, grayscale or black-and-white processing. Use HEIC to PDF when the photos are already correctly prepared and the main requirement is format conversion and page arrangement.
Privacy and performance
LyfPDF decodes HEIC files in the browser and builds the PDF locally. Large batches of high-resolution iPhone photos can use substantial memory, so convert in smaller groups on older phones and close unnecessary browser tabs.
Best for documents, printing and small text.
Best balance for ordinary photographs.
Smaller PDF for quick sharing.