H.264 vs VP9 vs AV1: Comparing Video Codecs for Web Streaming & Small File Sizes
When compressing a video to share on messaging apps, upload to a website, or save disk space, selecting the right video codec matters more than adjusting resolution. An outdated codec at 720p can take up twice as much storage as an advanced modern codec at 1080p, while delivering inferior picture clarity.
The three dominant codecs on the modern web are H.264 (AVC), VP9, and AV1. Here is how they compare in compression efficiency, encoding speed, and device compatibility.
The Contenders
1. H.264 / AVC (Advanced Video Coding)
Released in 2003, H.264 is the most universally compatible video format in computer history. Virtually every smartphone, smart TV, gaming console, browser, and car dashboard built in the past twenty years contains dedicated silicon hardware to decode H.264 without draining battery life.
- Pros: 100% device compatibility. Very fast encoding times. Plays seamlessly on legacy systems.
- Cons: Inefficient by modern standards. Requires high bitrates (3,000–5,000 kbps for clean 1080p) to avoid blocky compression artifacts in high-motion scenes.
2. VP9 (Google Open Codec)
Developed by Google as an open-source, royalty-free successor to VP8, VP9 powers the majority of YouTube's 1440p and 4K streams. It achieves roughly 35% to 50% better compression than H.264 at identical visual quality.
- Pros: Royalty-free. Natively supported in all modern browsers (Chrome, Edge, Firefox, Safari). Excellent balance between compression ratio and encoding time.
- Cons: Limited hardware acceleration on very old budget smartphones and older smart TV sets.
3. AV1 (AOMedia Video 1)
Created by the Alliance for Open Media (consisting of Google, Apple, Microsoft, Amazon, Netflix, Intel, and Meta), AV1 is the next-generation open standard designed to replace both H.264 and HEVC (H.265). It delivers 30% better compression than VP9 and up to 50% better compression than H.264.
- Pros: Unrivaled compression density. A 1080p video that requires 50 MB in H.264 can often be compressed to 20–25 MB in AV1 with zero visible degradation.
- Cons: Encoding takes significantly more CPU computation. Hardware decoding is present in newer chips (Apple M3/A17+, Snapdragon 8 Gen 2+, Intel 11th Gen+, Nvidia RTX 30+), while older devices rely on software decoding.
Benchmark Summary: Same 1-Minute 1080p Clip Compared
| Codec | Target Visual Quality | Average File Size | Encoding Time (Browser CPU) | Device Compatibility |
|---|---|---|---|---|
| H.264 (AVC) | High (CRF 22) | 42 MB | Fast (~15s) | 99.9% (Universal) |
| VP9 | High (CRF 30) | 26 MB | Moderate (~45s) | 95% (All modern browsers) |
| AV1 | High (CRF 32) | 19 MB | Slower (~90s) | 85% (Modern platforms) |
Which codec should you choose?
- Choose H.264 if the video must be shared via WhatsApp, embedded in PowerPoint slides, played on legacy smart TVs, or uploaded to portals that strictly require MP4/H.264.
- Choose VP9 for website video backgrounds, online portfolios, and streaming where you want small file sizes and guaranteed smooth playback across all desktop and mobile browsers.
- Choose AV1 for long-term personal video archives, cloud storage backups, or when maximum bandwidth savings are critical.
You can test and compress videos with any of these codecs directly on your device using Compress Video on File Studio.