Manatee

H.264 vs HEVC: which one your Mac, phone and recipients can open

· 6 min read

H.264 plays on every device made in the last fifteen years. HEVC (also called H.265) produces files about half the size at the same quality, and plays on every Apple device since 2017, but Windows PCs often need a paid add-on, older Android phones cannot decode it, and browser support is patchy. Record in HEVC to save space on your own devices; convert to H.264 before sending to anyone whose setup you do not control.

What the two codecs are

Both are video compression standards from the same standards body, one generation apart. H.264 (also called AVC) was finalized in 2003 and became the universal format for everything from Blu-ray discs to video calls. HEVC (High Efficiency Video Coding) followed in 2013 with a smarter set of tools for predicting and encoding motion, which is where the size savings come from.

At the same visual quality, an HEVC file is typically 40 to 50 percent smaller than H.264. For a 4K iPhone clip that is the difference between 400 MB a minute and roughly 200 MB. HEVC also supports 10-bit color and HDR metadata cleanly, which is why iPhones pair it with Dolby Vision. H.264 in practice is an 8-bit format for consumer video.

The cost is decoding effort and licensing. HEVC takes several times more computation to decode, so devices without dedicated hardware struggle, and its patent situation led many software makers to leave support out rather than pay for it.

Where each one opens

Mac: H.264 everywhere. HEVC in QuickTime, Photos, Preview and Safari on High Sierra and later, with hardware decoding on Apple silicon and on Intel Macs from 2017 onward. Older Intel Macs decode HEVC in software and may stutter at 4K.

iPhone and iPad: H.264 everywhere. HEVC playback on any device running iOS 11 or later; recording in HEVC on iPhone 7 and newer.

Windows: H.264 everywhere. HEVC only after installing the HEVC Video Extensions from the Microsoft Store, which is a paid add-on on most machines, or via a third-party player. A Windows recipient who “cannot open the video” almost always means this.

Android: H.264 everywhere. HEVC on most phones from the last several years, unreliable on budget models and anything older.

Web browsers: H.264 everywhere. HEVC in Safari, and in Chrome on machines with hardware decoding, but not reliably across the board. If you are uploading to a platform, it will usually transcode anyway, and H.264 uploads come out better because the platform’s encoder starts from a file it fully understands.

Smart TVs, game consoles, streaming sticks: H.264 everywhere; HEVC on most models from the last several years.

Presentation software, video conferencing, email previews: assume H.264 only.

The pattern is clear. H.264 has no failure cases. HEVC has a long list of conditions.

Which one to record in

On an iPhone, Settings > Camera > Formats offers two choices. High Efficiency records HEVC and HEIC; Most Compatible records H.264 and JPEG. The default is High Efficiency.

Keep the default if:

  • You mostly view the videos on Apple devices.
  • You want 4K at 60 frames per second, HDR, or Cinematic mode, which require HEVC.
  • Storage on the phone matters to you.

Switch to Most Compatible if you routinely send raw recordings to Windows users, upload directly to platforms that mishandle HEVC, or hand footage to an editor working on a PC. The files will be about twice as large.

A middle path that works for most people: keep High Efficiency for recording and convert the specific clips you share.

Converting HEVC to H.264 on a Mac

The conversion has to re-encode the video, since the whole point is replacing the codec. Expect it to run at roughly real time on an Intel Mac and faster on Apple silicon.

Manatee does it without settings to work through:

  1. Drag the HEVC file (typically a MOV from an iPhone) onto the Manatee icon in the menu bar, or drop it in the window.
  2. Choose Convert and pick MP4. The output is a standard MP4 that Windows, Android, browsers and presentation software open directly.
  3. The new file is written alongside the original. The original is never modified, so your HEVC master stays intact.
  4. If the recipient also has an upload or email limit, use Shrink instead and type the size in MB; the output is an MP4 that fits.

Manatee accepts 122 input types, so the same steps work for HEVC inside MKV, TS or MP4 containers. It is not an editor: it does not trim, crop or adjust color, and it cannot preserve Dolby Vision HDR through the conversion to H.264, because H.264 as commonly used does not carry it. HDR footage converted for a Windows recipient becomes standard dynamic range, which looks normal on their screen.

Apple’s own route is File > Export As in QuickTime Player, which offers 1080p and 720p presets; whether those produce H.264 or HEVC depends on the Mac, and the result is a MOV. For a predictable H.264 MP4, Manatee or a similar converter is the more reliable path. How to convert MOV to MP4 on a Mac has the step-by-step.

Going the other way

Converting H.264 to HEVC to save disk space is possible (Manatee’s Shrink mode is the practical version of this, since it targets a size rather than a codec), but it is lossy both ways. Compressing an already compressed file never recovers detail and always discards some. If space is the concern, How to reduce MP4 file size on a Mac without losing quality covers what is realistic.

What about AV1?

AV1 is a newer royalty-free codec with efficiency similar to or better than HEVC. Recent Apple silicon chips decode it in hardware and streaming services use it heavily, but as a format for files you send to people it is further behind HEVC in support. Treat it as a “convert to H.264 before sharing” format for now. Container vs codec: why an MP4 can still refuse to play covers how codecs and containers interact if you meet one in an MKV or WEBM.

Questions

Is HEVC better quality than H.264? At the same file size, yes. At the same quality, it is smaller. Neither is “sharper” by nature; the bitrate chosen by the encoder decides how the picture looks.

Why does the same video play on my Mac but not my colleague’s PC? Your Mac has an HEVC decoder built into macOS. Their PC needs the HEVC Video Extensions installed. Convert to H.264 and the question disappears.

Will converting to H.264 make the file bigger? Usually, yes, by around 50 to 100 percent at matched quality. Use Shrink mode with a target size if that matters.

Can I tell which codec a file uses without opening it? Select it in Finder, press Command-I, and read the Codecs line under More Info. “HEVC” or “H.264” appears there for MOV and MP4 files.