How to Convert Files for iPhone & iPad: Format Compatibility Guide

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.

Photo Formats on iPhone & iPad

HEIC/HEIF: Apple's Default Camera Format

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.

Method 3: Online conversion. Upload HEIC files to our image converter from Safari on your iPhone and download the JPG versions. See our complete guide on how to convert HEIC to JPG and our explainer on what HEIC format is.

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

Playing unsupported video formats on iOS:

1. Install VLC for iOS (free) -- it plays virtually every video format
2. Install Infuse (free tier available) -- excellent for MKV with subtitles
3. Convert to MP4 using our video converter before transferring to your device

For videos that are too large for your iPhone's storage, compress them first with our video compressor. See our guide on compressing video without quality loss.

Audio Formats on iPhone & iPad

The built-in Music app and Files app support most common audio formats:

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.

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:

1. Open the document in Pages/Numbers/Keynote
2. Tap the share icon, then "Export"
3. 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):

1. Convert to EPUB using Calibre on a computer or our ebook converter
2. Transfer to iPhone via AirDrop, email, or cloud storage
3. Open in Apple Books

For ebook format comparisons, see our AZW3 vs EPUB vs MOBI guide and our best ebook format guide.

Converting Files From iPhone for Other Platforms

When sharing files from an iPhone with Windows or Android users, convert these Apple-specific formats:

HEIC Photos to JPEG

The most common conversion need. Options:

1. Settings > Photos > Transfer to Mac or PC > Automatic (converts on share)
2. Use the image converter in Safari
3. Use the Shortcuts app to create a conversion automation

MOV Videos to MP4

1. Use the video converter in Safari
2. Use iMovie (free) to export as MP4
3. Use the Shortcuts app with "Encode Media" action

Pages/Numbers/Keynote to Office Formats

1. Open in the iWork app
2. Share > Export > choose Word/Excel/PowerPoint
3. The exported file is compatible with Microsoft Office

Live Photos to Standard Formats

Live Photos combine a still image with a short video clip. To share:

1. Open in Photos
2. Tap "Live" and select "Loop," "Bounce," or "Long Exposure" for video/image output
3. Share the result as a standard video or image

Storage Optimization Through Conversion

iPhone storage fills up quickly, especially with photos and videos. Strategic conversion can reclaim space:

1. Convert HEVC 4K videos to H.264 1080p for older content you want to keep but do not need in full resolution
2. Compress photos that do not need full resolution (screenshots, quick snaps)
3. Convert AIFF/WAV audio to AAC for music files that do not need lossless quality
4. Use iCloud Optimize Storage to keep full-resolution originals in the cloud and lighter versions on device

Automating Conversions with Shortcuts

The iOS Shortcuts app can automate common conversion tasks:

HEIC to JPEG shortcut:

1. Open Shortcuts > Create new shortcut
2. Add "Select Photos" action (allow multiple selection)
3. Add "Convert Image" action (set to JPEG, quality 0.9)
4. Add "Save to Photo Album" action
5. Run the shortcut to batch-convert selected photos

Video compression shortcut:

1. Add "Select Photos" (set to videos only)
2. Add "Encode Media" (set to smaller size or lower resolution)
3. Add "Save to Photo Album"

These shortcuts can be added to the share sheet for quick access from any app.

For more on mobile file conversion, see our guide on how to convert files on mobile, which covers both iOS and Android workflows. For Android-specific guidance, see how to convert files for Android.

Wrapping Up

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:

1. Know which formats iOS supports natively and install VLC or Infuse for unsupported video
2. Configure automatic HEIC-to-JPEG conversion in Settings if you frequently share photos with non-Apple users
3. Use MP4 (H.264) for videos you plan to share outside the Apple ecosystem
4. Convert documents to PDF or DOCX for universal compatibility
5. Use EPUB for ebooks on Apple Books, and convert other ebook formats before transferring

Our video converter, image converter, audio converter, and document converter all work in Safari on iPhone and iPad, so you can convert files directly on your device without installing additional apps.