LIVE CODEC COMPARISON
Compression, side by side.
One source, two versions. See the detail, measure the difference.
Experimental technology demo, provided as is. Using it gives you no patent licence for H.264, HEVC, VVC, AV1, VP9 or AV2. Built on the work of SVT-AV1, libaom, dav1d, libvpx, openh264, kvazaar, VVenC/VVdeC, AVM and the standards' authors, with thanks; written by AI coding agents under one person's direction. Credits, licences, patents and disclaimers · Clip credits
How to read this comparison +
Real pixels, real bitstreams
Each version is nanocodec encoding live in your browser, a stream pre-encoded offline by another encoder at the settings of the project’s charts, or the original source uncompressed; every coded version is decoded here by nanocodec’s Rust decoder in WebAssembly. Quality is PSNR-YUV against the exact source frame each version was given, not a perceptual score, and speed is browser wall time. The exact command of every version is under its picture. How the published results are measured, and the reference encoders’ versions and settings: the method page; how each preset compares: the results.
Your files stay here
Video and camera frames are processed locally. Downloads contain the real compressed stream: IVF for AV1/VP9/AV2, Annex-B for H.264/HEVC/VVC, at most 16 MiB each.