How to Compress Videos Without Losing Quality

A 4K stream that needs 16 Mbps encoded in H.264 needs about 8 Mbps in H.265, and roughly 4–5 Mbps in AV1 — the same visual quality at a third to a half the bandwidth, purely from the codec choice. Most people never touch this setting, which means most people are uploading video 2-3x larger than it needs to be for no visible benefit.

What the three codecs actually are

H.264 (AVC) is the oldest and most universally supported codec — every device, every platform, every browser plays it without question. It's also the least efficient of the three: the largest file size for a given quality level. Its advantage is speed — it's the fastest to encode, which is why it's still the default for live streaming and real-time applications.

H.265 (HEVC), standardized back in 2013, delivers roughly 50% bitrate savings over H.264 at equivalent visual quality. It hasn't become the universal default despite being over a decade old, largely because of licensing: at least three separate patent pools (plus additional unaffiliated patent holders) charge for its use, and the total cost has historically been unpredictable — enough to slow adoption across browsers and platforms.

AV1 is the newest of the three and offers up to 50% better compression than both H.264 and H.265 — sessions encoded in AV1 use roughly a third less bandwidth than either older codec, with meaningfully fewer buffering interruptions in real-world streaming tests. Unlike H.265, it's royalty-free: a coalition including Google, Netflix, Apple, Microsoft, Amazon, and Meta pooled their patents and released it license-free specifically to avoid HEVC's adoption problem. The tradeoff is encoding speed — AV1 takes meaningfully longer to encode than either older codec, which matters if you're processing video at scale but rarely matters for a single upload.

Which one to actually export in

For a single video going to Instagram, TikTok, or YouTube: H.264 remains the safest universal choice specifically because every platform re-encodes uploaded video on its own servers anyway — your source codec matters less than your source resolution and bitrate, since the platform is going to compress it again regardless. Where codec choice matters more is when you control both ends: self-hosting video on your own site or app, where AV1's bandwidth savings translate directly into faster load times and lower hosting costs.

The setting that matters more than codec for most people

Before worrying about codec, get resolution and bitrate right — a video shot in 4K and uploaded at 4K to a platform that displays it at 1080p on virtually every device is wasting the majority of its file size for zero visible benefit. Export at the resolution people will actually view it at (1080p covers the overwhelming majority of social video), and let the platform's own re-encoding handle the rest.

Two-pass encoding is worth knowing about too

Beyond codec choice, how a file gets encoded matters — single-pass encoding processes a video once and estimates bitrate allocation on the fly, while two-pass encoding analyzes the whole file first, then encodes with that full picture in mind. Two-pass produces a meaningfully better result at the same file size, at the cost of roughly double the encoding time. For anything where quality matters more than turnaround speed, it's worth enabling if your export software supports it.

What "encoding speed" actually costs you in practice

The encoding-speed difference between the three codecs matters more than it sounds like it should. H.264 can encode roughly in real time or faster on modern hardware, which is why it's the default for live streaming. AV1 can take several times longer to encode the same footage at comparable quality — fine for a one-off export you can leave running, genuinely limiting if you're processing hundreds of videos on a deadline. This is the practical reason AV1 hasn't fully replaced H.264 everywhere despite the bandwidth savings: the tradeoff is real compute time, not just a checkbox in export settings.

A simple rule that covers most cases

• Uploading to a social platform: export H.264, 1080p, and don't worry about codec further — the platform re-encodes it anyway.
• Self-hosting video (a website, an app): use AV1 where your player and audience support it, with an H.264 fallback for older devices.
• Editing or archiving a master file: keep resolution high and let compression happen only at export time, never on the working file — compressing the same file repeatedly degrades quality with each pass.