What is HEIC and why is it used on iPhones?
HEIC stands for High Efficiency Image Container, Apple's implementation of the HEIF (High Efficiency Image Format) standard based on the HEVC video codec. Apple introduced it as the default camera format on iPhone 7 with iOS 11 in 2017. The main reason for the switch was file size: a HEIC photo is typically about half the size of an equivalent JPEG while maintaining the same or better visual quality. This allows iPhone users to store roughly twice as many photos in the same storage space. The trade-off is that HEIC is not universally supported outside the Apple ecosystem.
Does HEIC to PDF conversion work in all browsers?
HEIC is natively supported in Safari on macOS (10.13 High Sierra and later) and iOS/iPadOS. This means HEIC to PDF conversion works seamlessly in Safari. Chrome, Firefox, and Edge on Windows and Android do not natively support HEIC decoding in the Canvas API, so conversion may not work in those browsers without additional software. If you are on an iPhone or Mac, use Safari for guaranteed compatibility. On Windows or Android, the most reliable approach is to set your iPhone to capture in JPEG format (Settings > Camera > Formats > Most Compatible) or convert HEIC files to JPEG on your Mac before uploading.
How do I convert HEIC to PDF on Windows?
On Windows, Chrome and Edge do not natively support HEIC. The most reliable options are: (1) Install the HEIF Image Extensions from the Microsoft Store, which enables HEIC support across Windows apps including browsers; (2) Open the HEIC file in the Photos app (which supports HEIC on Windows 11) and export it as JPEG, then use PurePDF to convert the JPEG to PDF; (3) Use a Mac or iPhone with Safari to do the conversion directly using PurePDF's native HEIC support.
Can I prevent my iPhone from shooting in HEIC format?
Yes. Go to Settings > Camera > Formats on your iPhone or iPad. Select "Most Compatible" instead of "High Efficiency". This tells the camera to capture photos in JPEG format instead of HEIC. The trade-off is larger photo file sizes — each photo will take up roughly twice as much storage. If you frequently need to share photos with non-Apple users or convert them for document workflows, "Most Compatible" is the more practical setting.
Are my HEIC photos uploaded to a server during conversion?
No. PurePDF's conversion runs entirely in your browser using the Canvas API. Your HEIC photos never leave your device. This is particularly important given that iPhone photos often contain personal metadata including GPS location, time, date, and device information embedded in the EXIF data. With PurePDF, this data stays on your device — nothing is sent to any server.
Does converting HEIC to PDF preserve photo quality?
PurePDF renders the HEIC image at its native resolution and re-encodes it as JPEG within the PDF at your chosen quality setting. At the default 92% quality, the visual result is excellent and virtually indistinguishable from the original for normal viewing. HEIC itself uses advanced compression that is superior to JPEG, so there will be some quality trade-off in the re-encoding step, but at high quality settings this is negligible for practical purposes.
Can I convert multiple HEIC photos into one PDF?
Yes. Drop multiple HEIC files at once and they will be combined into a single multi-page PDF — one photo per page. You can reorder them by dragging thumbnails before converting. This is useful for creating a photo report, compiling event photos into a document, or assembling a portfolio. There is no enforced limit on the number of files in a batch, though very large batches may require more time depending on your device.
Does HEIC support transparency, and will it be preserved in the PDF?
HEIC supports transparency (alpha channel) through the HEIF standard. However, PDF pages have opaque white backgrounds by default. Any transparent areas in your HEIC photos will be rendered against a white background in the PDF output. For standard iPhone camera photos, this is irrelevant since camera images never have transparency. It may be relevant for HEIC files generated by apps that export graphics with transparent backgrounds.
Is HEIC to PDF conversion free?
Yes, completely free. No signup, no watermarks, no file limits, no premium tier required. PurePDF is free for all users.
What are the best use cases for HEIC to PDF conversion?
The most common use cases include: sharing iPhone photos with Windows users who cannot open HEIC files; submitting photos as part of a formal document (insurance claims, job applications, property records); combining multiple iPhone photos into a single document for reporting; archiving photos in a universally-readable format that will remain accessible without Apple-specific software; and uploading photos to services that accept PDF but not HEIC.