H.264 vs H.265 (HEVC): Which Video Codec Should You Use?
H.265 halves file size at the same quality but needs more support and power, H.264 plays everywhere. Here's when each codec wins for video.
H.264 and H.265 are video codecs: the methods that compress the video inside a file (like an MP4 or MOV). They're not file formats themselves. A single MP4 can contain either. Choosing between them is a trade-off between compatibility and efficiency.
H.265, also called HEVC, is the newer codec. It roughly halves the file size of H.264 at the same visual quality, which is why phones and 4K cameras increasingly record in it. The cost is that it demands more processing power to encode and decode, and older devices, browsers and editors don't always support it, which is why an HEVC video sometimes 'won't play'.
H.264 (AVC) is the older, universal workhorse. It's less efficient, so files are larger, but it plays on virtually everything with no compatibility worries and is fast to encode. Below is the breakdown, a clear rule for choosing, and the tools to convert a video to a compatible format when H.265 won't play.
H.264 vs H.265 (HEVC), compared
Every dimension that actually affects the decision, at a glance.
| Dimension | H.264 | H.265 (HEVC) |
|---|---|---|
| File size / efficiency | Larger, older, less efficient compression. | About half the size at the same quality. |
| Compatibility | Universal: plays on virtually everything. | Growing, but older devices/browsers often can't play it. |
| Encoding / decoding power | Light: fast and easy on any hardware. | Heavier. Needs more CPU/GPU, especially to encode. |
| Quality at low bitrate | Good. | Better. Keeps more detail when heavily compressed. |
| Common use | Web video, streaming, sharing, older devices. | 4K/HDR capture, storage-efficient recording. |
| Best for | Maximum compatibility and easy playback. | Saving space when your devices support it. |
Which one is right for you?
Choose H.264 when
- You need the video to play on any device, browser or platform.
- You're uploading or sharing widely and can't assume modern hardware.
- You want fast encoding on modest hardware.
- Compatibility matters more than saving storage.
Choose H.265 (HEVC) when
- You want to halve file size at the same quality for storage.
- You're capturing 4K/HDR where efficiency really pays off.
- Your devices and viewers all support HEVC.
- Bandwidth or disk space is the priority.
The verdict
Use H.264 for anything you need to share or that must simply play everywhere: it's the safe universal choice. Use H.265 (HEVC) to save space when you control the devices and they support it, like 4K recording and archival. When an HEVC video won't play somewhere, converting it to H.264 (in an MP4) is the standard fix.
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Tools for this comparison
Video Converter
Convert video between MP4, WebM, MOV, AVI, MKV and GIF in your browser with FFmpeg. Pick a target format, tune MP4 quality, preview the result and download. Nothing is uploaded.
Video Compressor
Compress video in your browser with FFmpeg, shrink MP4, MOV, WebM and MKV files with a simple quality slider, see the exact bytes and percentage saved next to a live preview, then download. Nothing is uploaded.
MOV to MP4
Convert MOV (QuickTime) to MP4 in your browser, a universally compatible H.264/AAC file that plays and uploads everywhere. Real FFmpeg transcoding, in-page preview, one-click download. Nothing is uploaded.
MP4 to WebM
Convert MP4 to WebM (VP9) in your browser: a leaner, royalty-free format that streams natively in modern browsers. Tune the quality, preview the result and download. Nothing is uploaded.
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- MOV vs MP4MOV is Apple's QuickTime container built for editing. MP4 is the cross-platform standard for sharing. Here's when each format is the right call.7 dimensions
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