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Supports: MOV
.mov videos. Batch is supported, so a folder of iPhone clips can be processed in one pass.12.5 for the 12.5-second mark), or Multiple Screenshots to extract a series — set the capture rate from one frame every 0.1s up to one every 10s..heif (or .heic) still. Files process in your browser session — no sign-up, no watermark, no upload to a third-party cloud.MOV is Apple's QuickTime container, the format every iPhone, iPad, and Mac uses for video by default. HEIF — High Efficiency Image File Format, standardised as ISO/IEC 23008-12 — is the still-image counterpart Apple adopted in iOS 11 and macOS High Sierra (Apple Support). Pulling stills out of a MOV as HEIF keeps the workflow inside Apple's native pipeline: the frames drop straight into Photos, iCloud syncs them, and Files-app previews work without any plugin. Compared to JPEG, HEIF cuts file size by roughly half at equivalent visual quality, which adds up fast when you extract dozens of frames per clip.
| Property | HEIF (.heif / .heic) | JPEG (.jpg) | PNG (.png) |
|---|---|---|---|
| Underlying codec | HEVC (H.265) for HEIC variant | DCT-based JPEG (1992) | Deflate (lossless) |
| Typical size for the same frame | ~1× | ~2× larger than HEIF | ~5–10× larger (lossless) |
| Bit depth | 8-bit and 10-bit | 8-bit only | 8-bit and 16-bit |
| HDR / wide colour | Yes (HDR10, Display P3) | No | Limited (no HDR transfer) |
| Transparency (alpha) | Yes | No | Yes |
| Browser support (2026) | Safari 17+ only | All major browsers | All major browsers |
| Native on iPhone / Mac | Yes (default since iOS 11) | Yes | Yes |
| Native on Windows | Requires "HEIF Image Extensions" from Microsoft Store | Yes | Yes |
| Best for | Apple-ecosystem stills, iCloud, storage savings | Web sharing, universal compatibility | Diagrams, screenshots, lossless edits |
If you need cross-browser compatibility instead, MOV to JPG ships frames every browser can render, and MOV to PNG gives you lossless stills for editing.
| Choice | Setting | What you get | Use case |
|---|---|---|---|
| Specific Frame | Time = 0 |
1 still at the first frame | Cover image / thumbnail |
| Specific Frame | Time = 30.5 |
1 still at the 30.5-second mark | Pulling a precise moment |
| Multiple Screenshots | Every 0.1s | 10 stills per second of video | Frame-by-frame motion study |
| Multiple Screenshots | Every 1s | 1 still per second | Storyboard / contact sheet |
| Multiple Screenshots | Every 5s | 1 still every 5 seconds | Visual summary of long clip |
| Quality Preset | Highest | Largest file, near-lossless | Print or archival |
| Quality Preset | Very High (default) | Visually lossless to most viewers | General-purpose extraction |
| Quality Preset | Medium / Low | 30–60% smaller files | Sharing, quick previews |
.heif or .heic?The two extensions describe the same container: .heic is the standard label when the still is encoded with HEVC (H.265), per ISO/IEC 23008-12 Annex B; .heif is the more general label. Apple devices and most camera firmware always write .heic. The two are interchangeable on Apple platforms, and Windows treats them identically once the HEIF Image Extensions package is installed.
Native support is uneven. macOS Sierra+, iOS 11+, iPadOS, and Apple Vision Pro decode HEIF out of the box. Windows 10 and 11 need the free HEIF Image Extensions from the Microsoft Store. Android added system-wide HEIF read support in Android 9 (Pie) but many gallery and chat apps still convert to JPEG on share. In browsers, only Safari 17+ on macOS and iOS 17+ render HEIF natively — Chrome, Firefox, and Edge have no native decoder (caniuse.com/heif). For anything destined for the open web, consider HEIF to JPG before publishing.
Apple's published guidance is that HEIF/HEVC roughly halves storage versus JPEG/H.264 at matching visual quality. Independent tests usually report HEIF files at 40–60% of the JPEG size for the same frame, with the gap widening on detail-heavy images. The savings come from HEVC's intra-frame prediction, which is far more efficient than JPEG's 1992-era 8×8 DCT blocks.
No. A Live Photo is a still HEIF paired with a 3-second MOV; what xconvert receives is the MOV side only. Frame extraction produces standard single-image HEIFs without the Live Photo motion track or audio. If you want the original Live Photo still instead of a video frame, export it directly from Photos — the still HEIF is already there.
For most sports analysis, 0.1 seconds (10 fps) is enough to break down a swing, throw, or stride into discrete poses. Faster motion — a tennis serve, a baseball pitch — benefits from the 0.1s rate combined with Highest quality so fast-moving limbs aren't softened by compression. For longer clips where you only need keyframes, 1 second per frame keeps the file count manageable.
Yes, as long as you keep the resolution at Original and pick Highest or Very High quality. iPhones since the 12 Pro can record Dolby Vision HDR at 4K; HEIF preserves the 10-bit colour data that JPEG would clip to 8-bit sRGB. Don't downscale to a 1080p preset if you want to keep all the sensor detail — set Width x Height to 3840 x 2160 or leave the resolution dropdown on Keep original.
Two reasons. First, HEIF can carry an embedded ICC colour profile (often Display P3 from iPhone capture); apps that ignore the profile render the still in sRGB and colours look duller. Second, on Windows the HEIF Image Extensions package occasionally maps 10-bit HDR to 8-bit and lifts the gamma curve. Viewing the file on the device that captured the MOV — typically the iPhone or Mac — gives you the reference appearance.
Yes, HEIF with HEVC is lossy by default — the Quality Preset drives how aggressive the compression is, with Highest being near-visually-lossless and Lowest heavily compressed. Your MOV file is never modified: xconvert reads frames from a copy in your browser session and writes new HEIF files. The original .mov stays untouched on your device.
xconvert produces one HEIF per extracted frame. To assemble them into a contact sheet or animation, run a follow-up step — e.g., extract at 1-second intervals, then use JPG to PDF (after a one-step HEIF-to-JPG conversion) to stitch them, or import the stills into a video editor as an image sequence. For a short looping animation, MOV to GIF is usually a better starting point than frame-by-frame stills.