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Audio bitrate (for audio output):

Drop an AV1 file above and the tool remuxes it into a WebM container using a stream copy - your video track is repackaged losslessly in seconds. WebM natively supports AV1 video, so no quality is lost in the process. The conversion runs entirely in your browser via WebAssembly; your file never leaves your device.

How it works

Click the upload area and select your .av1 or .mkv/mp4 file containing an AV1 video track.
The tool loads FFmpeg.wasm in your browser - a one-time 31 MB download on first use.
FFmpeg remuxes the stream into a .webm file using -c copy - no re-encode.
A download link appears with your converted file - click to save it.

AV1 to WebM Converter Online

Last reviewed: 2026-07-30

AV1 is a royalty-free video codec; WebM is an open container format that supports it natively. When your editing software exports an .av1 file and your streaming platform or media player requires a .webm extension, this tool bridges that gap in seconds - a lossless stream copy, no quality lost.

Key features

Lossless stream copy - the AV1 video track is repackaged into a WebM container without re-encoding, so the output is byte-for-byte identical in quality to the source.
Runs entirely in your browser tab via FFmpeg.wasm and WebAssembly; your file is processed on your device and nothing is uploaded to a server.
The 31 MB WASM binary downloads once on your first conversion and is cached, so later conversions start immediately.
The output format is fixed to WebM, so there is no format setting to choose.

Common uses

Packaging AV1 footage for web playback in Chromium-based browsers.
Preparing clips for video editors that read .webm but not raw .av1 files.
Stripping the .mp4 wrapper from a file whose video track is already AV1-encoded.

Your files stay on your device

The conversion runs locally in your browser tab through FFmpeg.wasm via WebAssembly; nothing is uploaded to a server. After the one-time 31 MB binary download is cached, subsequent conversions start immediately.

Need MP4 instead? Try AV1 to MP4 Converter.

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Last updated: Oct 15, 2026

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Frequently Asked Questions

What does AV1 to WebM Converter Online do?

Convert a AV1 input into a WEBM output - one step, in the browser.

When should I reach for av1 to webm converter online?

Typical use: when your downstream platform accepts WEBM but not AV1.

What complementary tools work well alongside av1 to webm converter online?

If you need the reverse direction, look at the related-tools section for the WEBM-to-AV1 converter.