Convert WebM to OGG (Vorbis) Online
Extract audio from WebM files to OGG Vorbis. When WebM already contains Vorbis, extraction is via stream copy with no re-encoding. Free, in your browser.
.webm · up to 100 MB
What you can do
WebM to OGG: same Vorbis codec, different container
Stream copy when Vorbis
If the WebM already has Vorbis audio, conversion is instant with zero loss.
Xiph.Org family
Vorbis and OGG are from the same open-source ecosystem, patent-free and royalty-free.
100% private
Your WebM never leaves your device. Local processing with FFmpeg.wasm.
Screen and web recordings
Extract narration from browser recordings, video calls, and screencasts.
How it works
Three steps, no hassle
Upload your WebM file
Drag or select your .webm with Vorbis or Opus audio. Up to 500 MB, no signup.
Extraction to OGG
FFmpeg.wasm detects the WebM audio codec. If it's Vorbis (CodecID A_VORBIS), it does a direct stream copy to the OGG container without re-encoding. If it's Opus, it transcodes to Vorbis.
Download your OGG
OGG Vorbis file ready for desktop players, web, or streaming. Download with one click.
FAQ
Got questions?
WebM and OGG are both Xiph.Org Foundation projects. WebM is a container based on Matroska (MKV) restricted to VP8/VP9/AV1 codecs for video and Vorbis/Opus for audio. OGG is Xiph.Org's standard container for audio (and video with Theora). Vorbis is exactly the same audio codec regardless of whether it's encapsulated in WebM or OGG. This means that when a WebM file contains Vorbis audio, converting to OGG is a stream copy: the Vorbis packets move from the WebM/Matroska container to the OGG container without any re-decoding or re-encoding. Quality is identical, the operation is nearly instant, and there is no loss of any kind.
Historically, WebM used Vorbis as the sole audio codec until the IETF standardized Opus (RFC 6716) in September 2012. Since then, modern browsers prefer Opus over Vorbis because Opus has better quality at low bitrates (especially voice at 6–32 kbps), lower latency (real-time applications), and better quality for mixed audio. Chrome records audio in WebM with Opus since Chrome 74 (2019). Older WebM files (pre-2013) or those generated by legacy software likely contain Vorbis. Webcam or microphone recordings from the browser in 2025 almost universally use Opus.
OGG Vorbis is entirely patent-free and royalty-free (unlike MP3, which had patents until 2017, and AAC, which still has Fraunhofer/VIA licensing). Vorbis was designed specifically for high-quality streaming: it uses a psychoacoustic model based on variable-time windows (256 to 8192 samples) with MDCT transform, producing perceptual quality superior to MP3 at the same bitrate according to Hydrogenaudio comparison studies. OGG Vorbis is the preferred audio format on Linux, open-source games (Godot Engine, OpenMW, many Steam games for Linux), and web applications that prioritize patent-free formats.
Yes, this is one of the most frequent use cases. Browser screen recording tools (such as those built into Chrome DevTools, OBS with WebM output, or JavaScript's MediaRecorder API) produce WebM files with microphone or system audio. Extracting audio to OGG Vorbis allows using the narration in open-source video editors (Kdenlive, OpenShot, Blender VSE), in e-learning projects with Moodle or LMS systems that accept OGG, or in podcasts for platforms that accept OGG directly.
OGG Vorbis has native support in Firefox, Chrome, Edge, and Opera for many years. Safari on macOS and iOS does not support OGG Vorbis natively (Apple prefers AAC), although VLC and other third-party players play it. Android supports OGG Vorbis since Android 2.3 (Gingerbread, 2010). On desktop, virtually all players (VLC, foobar2000, MusicBee, Winamp) play OGG. For maximum Apple device compatibility, consider converting to AAC instead.
Yes. Local recordings of Google Meet, Jitsi, and other web video conferences frequently generate WebM. Extracting audio to OGG allows using it with transcription tools like Whisper (OpenAI), which accepts OGG Vorbis directly. If the recording has native Vorbis, stream copy is instant. If it has Opus, transcoding to Vorbis adds minimal additional loss. For voice transcription, the difference between Opus and Vorbis at typical recording bitrates (128–192 kbps) is imperceptible to speech recognition models.
Convert WebM to OGG: extract Vorbis audio with stream copy or transcode from Opus
Converting WebM to OGG exploits a unique technical relationship between these two formats: both WebM and OGG are Xiph.Org Foundation projects and share the Vorbis codec as the audio standard. The WebM container, developed by Google and On2 Technologies (acquired in 2010) and published in May 2010 alongside the VP8 video codec at Google I/O, uses a simplified version of the Matroska (MKV) container restricted exclusively to VP8, VP9, and AV1 codecs for video, and Vorbis and Opus for audio. The OGG container, developed by Xiph.Org, is the reference container for Vorbis and Opus, using the OGG page system with a 26-byte page header including sequence number, CRC-32, and granule number for precise stream positioning. When a WebM file contains Vorbis audio with CodecID A_VORBIS in the Matroska audio track, the Vorbis packets encapsulated in Matroska SimpleBlock blocks can be extracted directly and re-encapsulated into OGG pages without any re-decoding of the audio signal, because Vorbis packets are binary-identical regardless of the external container wrapping them. This stream copy operation is the most efficient possible: nearly instantaneous, no significant CPU usage for decoding or encoding of any kind, and with absolutely identical quality to the original source with zero additional loss. For WebM files containing Opus audio instead of Vorbis, the tool transcodes by decoding to intermediate PCM and re-encoding to Vorbis, being transparent with the user about this transcoding process between two different lossy codecs and its associated quality implications. The OGG container's patent-free and royalty-free status, combined with broad native support in Linux desktop environments, open-source game engines, and Xiph.Org ecosystem tools, makes it the preferred output format for developers and content creators who prioritize open standards over proprietary formats.
The historical evolution of WebM and the role of Vorbis versus Opus in this ecosystem is relevant for understanding what type of WebM file you will have in each situation. In May 2010, Google published WebM with support only for Vorbis as the sole audio codec in the first version of the container specification. Between 2010 and 2013, all WebM files generated by Google tools such as YouTube, the Chrome recorder, and WebRTC in its experimental phase used Vorbis exclusively. In September 2012, the IETF published RFC 6716 standardizing Opus, a codec designed specifically to replace both Speex for low-latency voice and Vorbis for high-quality music in a single unified codec with a bitrate range from 6 to 510 kbps. Chrome added Opus support in WebM in version 26 from 2013 for WebRTC applications, and since Chrome 74 in 2019 MediaRecorder recordings in WebM format use Opus by default in all browser recording contexts available. Firefox follows a similar pattern, with Opus support in WebM since Firefox 28 in 2014. Thus, a WebM file from before 2013 almost certainly has Vorbis and enables direct lossless stream copy to OGG, while a WebM generated between 2018 and 2025 likely has Opus and requires Vorbis transcoding with minimal additional loss. WebM audio files downloaded from YouTube in medium quality tiers before 2013 also tend to contain Vorbis rather than Opus. Understanding this historical divide allows you to predict in advance whether your WebM file will benefit from a zero-loss stream copy to OGG or whether a Vorbis transcoding step will be required, and the tool handles both cases transparently with appropriate FFmpeg processing for each codec path.
Convertir.ai runs WebM to OGG conversion entirely in the browser using FFmpeg.wasm. Processing begins with analysis of the WebM's EBML header, which follows the Matroska specification with DocType set to webm rather than matroska to indicate the restricted profile in use. The SeekHead provides absolute offsets for the Tracks and Cues blocks within the Segment for direct access without linear scanning. For the audio track identified by TrackType=2, the CodecID element in TrackEntry determines the processing path to follow. For A_VORBIS with native Vorbis audio, FFmpeg executes complete stream copy: the three Vorbis header packets (the identification header with sample rate, channel count, and stream nominal bitrate; the comment header with artist, title, and album metadata; and the setup header with codebook tables and window mode definitions) stored in the track's CodecPrivate Matroska element are converted into the first OGG pages of the output file with the appropriate OGG page header structure for each one. The audio packets from the WebM's SimpleBlock blocks are packed into OGG pages of up to 255 segments with a maximum of 65,025 bytes per OGG page. The granule position number for each OGG page is calculated by accumulating the sample sizes of preceding packets, enabling efficient and precise seeking in the resulting OGG file. For A_OPUS with native Opus, FFmpeg uses the libopus decoder to produce 32-bit float PCM at 48 kHz, which the libvorbis encoder converts to VBR Vorbis at the quality level selected by the user. Vorbis comments from the WebM, stored either in the Opus CodecPrivate header or in Matroska tag elements, are transferred to the COMMENT_HEADER of the first OGG page to preserve artist, title, and other metadata for players that display tag information.