Overview
This guide compares H.264 (AVC) and H.265 (HEVC) across the most important criteria to help you choose the right format for your needs.
H.265 offers 50% better compression than H.264 but requires more processing power and has less universal support.
Head-to-Head Comparison
Compression
H.264 (AVC): H.264 is less efficient but uses less CPU for encoding/decoding.
H.265 (HEVC): H.265 achieves 50% smaller files at equivalent quality.
Winner: H.265
Compatibility
H.264 (AVC): H.264 is supported by every device, browser, and platform.
H.265 (HEVC): H.265 requires modern hardware - older devices may not support it.
Winner: H.264
CPU Usage
H.264 (AVC): H.264 decodes easily on all hardware including older CPUs.
H.265 (HEVC): H.265 requires modern hardware for smooth decoding.
Winner: H.264
4K Video
H.264 (AVC): H.264 can do 4K but files are very large.
H.265 (HEVC): H.265 is the standard codec for 4K and HDR video.
Winner: H.265
Streaming
H.264 (AVC): H.264 is the universal streaming standard (YouTube, Netflix use both).
H.265 (HEVC): H.265 is increasingly used for high-quality streaming.
Winner: Tie
Technical Foundations
H.265 (HEVC, High Efficiency Video Coding) is the successor to H.264 (AVC, Advanced Video Coding), both developed jointly by ITU-T and ISO/IEC.[1][2] The largest structural change is the coding block: where H.264 partitions frames into fixed 16x16 macroblocks, HEVC uses flexible coding tree units up to 64x64 that can be recursively subdivided, letting the encoder allocate bits efficiently across both large flat regions and fine detail.[1] HEVC also adds more intra-prediction directions and improved motion compensation and entropy coding.
Compression Efficiency
These tools let HEVC achieve approximately the same subjective quality as H.264 at substantially lower bitrates, with figures commonly cited around a 50 percent bitrate reduction, at the cost of significantly higher computational complexity for both encoding and decoding.[2] HEVC was designed with high resolutions in mind and scales efficiently to 4K and 8K, where H.264's older toolset becomes less economical.[1]
Both Are Codecs, Not Containers
H.264 and H.265 define how video is compressed, not how it is stored as a file. Streams encoded with either codec are placed inside a container such as MP4, MKV, or MOV, which adds audio, subtitles, and timing.[2] The same codec can appear in different containers, and a container can hold either codec, which is why a file's extension does not indicate which codec it uses.
Licensing and Hardware
A practical difference is patent licensing. H.264 has a mature, widely-accepted licensing framework and near-universal hardware decode support.[2] HEVC's licensing is administered across multiple patent pools, which has slowed its adoption on the open web and contributed to the development of royalty-free alternatives such as AV1.[1] Hardware HEVC decoding is common on modern devices but less universal than H.264.
Compatibility and Applications
H.264 remains the most universally supported video codec, decodable by virtually every device and browser, making it the safest choice for broad distribution.[2] H.265 is used where bandwidth or storage savings at high resolution justify its heavier processing and licensing, such as 4K streaming, modern broadcast, and recent mobile-device video capture.[1]
Convert Between H.264 (AVC) and H.265 (HEVC)
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Convert Files NowFrequently Asked Questions
Is H.265 worth it over H.264?
H.265 gives 50% smaller files at equivalent quality, which is significant for 4K content. Use H.265 when compatibility is not a concern.
Can all computers play H.265?
Modern computers (post-2015) handle H.265 well. Older hardware may struggle. Check your hardware support before converting.
Do streaming services use H.265?
Netflix and Amazon use H.265 for 4K content. YouTube uses VP9 and AV1. Most platforms still use H.264 for HD content.
Which should I use for YouTube uploads?
YouTube accepts both. H.264 is safe and widely supported. H.265 may be re-encoded by YouTube anyway.
Is H.265 free to use?
H.265 has complex patent licensing. H.264 is more straightforward. AV1 and VP9 are royalty-free alternatives.