How to Convert Files for iPhone & iPad: Format Compatibility Guide
Learn which file formats work on iPhone and iPad, how to convert incompatible files, and tips for handling HEIC photos, MOV videos, document formats, and ebook files on iOS devices.
Emma Wilson·February 19, 2026·9 min read
Why File Formats Matter on Apple Devices
Apple's ecosystem is remarkably self-contained. iPhones and iPads produce files in Apple-preferred formats (HEIC for photos, MOV for videos, Pages/Numbers/Keynote for documents), and the ecosystem handles these formats seamlessly -- as long as you stay within it. The moment you need to share files with Windows or Android users, upload to non-Apple services, or open files from other platforms, format compatibility becomes a real issue.
The reverse is also true. Files that work perfectly on a Windows PC or Android phone may not open on your iPhone: certain video codecs do not play in the iOS media player, some document formats lack native viewer support, and ebook formats beyond EPUB and PDF have limited options on iOS.
This guide covers both directions of the compatibility equation: converting files from Apple formats for external use, and converting external files into formats that work on iPhone and iPad. Whether you are managing photos from an iPhone camera, preparing videos for sharing, handling documents across platforms, or reading ebooks on your iPad, this guide has you covered.
File format compatibility overview for iPhone and iPad showing supported and unsupported formats
Since iOS 11 (2017), iPhones shoot photos in HEIC (High Efficiency Image Coding) by default. HEIC produces files roughly 50% smaller than JPEG at equivalent quality, which saves significant storage on devices with limited capacity.
The compatibility problem: Windows 10 and later support HEIC with a codec download, but older systems, some web platforms, and many applications do not recognize the format. When you share a HEIC photo via email or upload it to a website, the recipient may see a broken image.
Converting HEIC to JPEG on iPhone:
Method 1: Change the sharing format. Go to Settings > Camera > Formats and select "Most Compatible." This makes the camera shoot in JPEG directly.
Method 2: Automatic conversion when sharing. Go to Settings > Photos > Transfer to Mac or PC > Automatic. iOS converts HEIC to JPEG automatically when sharing via AirDrop, email, or apps that do not support HEIC.
Pro Tip: If you are a photographer using ProRAW on iPhone, your DNG files can be 25-50 MB each. Before sharing, convert to high-quality JPEG to reduce file size dramatically. Our image converter handles DNG-to-JPEG conversion while preserving the color accuracy that makes ProRAW valuable.
Video Formats on iPhone & iPad
MOV: Apple's Native Video Format
iPhones record video in MOV (QuickTime) format with H.264 or H.265 (HEVC) encoding. These files play perfectly on Apple devices and Macs but can be problematic on other platforms.
Converting MOV for sharing:
The most reliable approach is converting to MP4 (H.264), which plays on every device and platform. See our guide on how to convert MOV to MP4 for the full workflow.
Video Formats iOS Can Play
Format
Codec
iPhone/iPad Support
Notes
MOV
H.264, HEVC, ProRes
Full (native)
Default recording format
MP4
H.264, HEVC
Full
Most common video format
M4V
H.264
Full
Apple's DRM-capable MP4 variant
MKV
Varies
Via third-party apps (VLC, Infuse)
Not natively supported
AVI
Varies
Via third-party apps
Not natively supported
WebM
VP8, VP9, AV1
Safari only (since iOS 16)
Limited native support
WMV
WMV
Via third-party apps
Not natively supported
Playing unsupported video formats on iOS:
Install VLC for iOS (free) -- it plays virtually every video format
Install Infuse (free tier available) -- excellent for MKV with subtitles
Convert to MP4 using our video converter before transferring to your device
Converting video and image files for iPhone and iPad compatibility
Audio Formats on iPhone & iPad
The built-in Music app and Files app support most common audio formats:
Format
Support Level
Notes
AAC / M4A
Full (native)
Apple's preferred format, best quality/size ratio
MP3
Full
Universal compatibility
WAV
Full
Lossless but large files
AIFF
Full
Apple's lossless format
ALAC
Full
Apple Lossless, native support
FLAC
Full (since iOS 11)
Open-source lossless
OGG Vorbis
Via third-party apps
Not natively supported by Music app
WMA
Via third-party apps
Not natively supported
For audio formats that iOS does not support natively, convert to M4A (AAC) or MP3 using our audio converter. M4A offers better quality at the same file size compared to MP3 and is Apple's preferred format.
Pro Tip: If you are transferring a music library to your iPhone, convert OGG and WMA files to AAC (M4A) rather than MP3. AAC at 256 kbps is audibly transparent (indistinguishable from lossless) on iPhone hardware, and the files are smaller than equivalent MP3s.
Document Formats on iPhone & iPad
Viewing Documents
iOS handles document viewing well through the Files app, Quick Look, and built-in apps:
PDF: Full support in Files, Safari, Mail, and every third-party app
DOCX/DOC: Viewable in Files, editable in Pages or Microsoft Word
XLSX/XLS: Viewable in Files, editable in Numbers or Microsoft Excel
PPTX/PPT: Viewable in Files, editable in Keynote or Microsoft PowerPoint
TXT: Full support
RTF: Viewable in Files and Quick Look
HTML: Opens in Safari
Creating and Exporting Documents
Apple's iWork apps (Pages, Numbers, Keynote) export to multiple formats:
Open the document in Pages/Numbers/Keynote
Tap the share icon, then "Export"
Choose the target format (PDF, Word, Excel, PowerPoint, EPUB)
For formats not supported natively: Use Safari to access the document converter and convert files directly on your iPhone or iPad. This handles conversions like Markdown to PDF, ODT to DOCX, and other pairs that iOS cannot manage natively.
Ebook Formats on iPhone & iPad
Apple Books natively supports:
EPUB: The primary format for Apple Books
PDF: Full support with annotation
iBooks (IBA): Apple's proprietary format
Kindle app supports:
AZW3, AZW, MOBI: Amazon's formats
For other ebook formats (FB2, MOBI outside Kindle, CBR/CBZ comics):
Convert to EPUB using Calibre on a computer or our ebook converter
Transfer to iPhone via AirDrop, email, or cloud storage
iPhone and iPad format compatibility has improved dramatically with each iOS version, but gaps remain -- especially for video formats, some audio codecs, and specialized document types. The key strategies are:
Know which formats iOS supports natively and install VLC or Infuse for unsupported video
Configure automatic HEIC-to-JPEG conversion in Settings if you frequently share photos with non-Apple users
Use MP4 (H.264) for videos you plan to share outside the Apple ecosystem
Convert documents to PDF or DOCX for universal compatibility
Use EPUB for ebooks on Apple Books, and convert other ebook formats before transferring
