Convert FLAC to OGG (Vorbis) Online
Convert lossless FLAC audio to OGG Vorbis for web distribution, games, and space-limited devices. The lossless source guarantees the best possible OGG quality. Free, in your browser.
.flac · up to 100 MB
What you can do
FLAC to OGG: lossless to the best possible Vorbis
Lossless source
Converting from FLAC guarantees the resulting OGG is as good as the Vorbis codec can generate.
100% private
Your FLAC file never leaves your device. All processing is local.
Web and games
OGG Vorbis is the standard audio asset format for video games and web applications.
Quality control
Choose the Vorbis quality level to match your size and fidelity requirements.
How it works
Three steps, no hassle
Upload your FLAC file
Drag or select your lossless .flac file. Up to 200 MB, no signup.
FLAC → OGG Vorbis encoding
FLAC is decoded to perfect PCM and encoded with the Vorbis encoder. Only one generation of quality loss.
Download your OGG
Optimized OGG Vorbis file ready for web, games, apps, or Android players.
FAQ
Got questions?
Converting from FLAC guarantees the best possible quality for the resulting OGG because FLAC is lossless audio: the PCM it produces when decoded is mathematically identical to the original audio. When you convert from MP3 to OGG, or from OGG to OGG at a different bitrate, you are performing a lossy-to-lossy transcode: two generations of cumulative loss that degrade the audio more than necessary. The golden rule in audio production is always encode to lossy formats from the lossless source (FLAC, WAV, AIFF). If you have masters in FLAC, that FLAC is your definitive source file; all distribution formats (MP3, OGG, AAC, Opus) should be generated from the FLAC, never from an already-compressed version.
The Vorbis encoder uses a quality scale from -1 to 10. The most commonly used values are: q3 (≈112 kbps variable) for voice and simple content; q5 (≈160 kbps) considered the 'transparent' quality point for general music by most blind listening studies; q6 (≈192 kbps) for extra headroom in content with heavy high-frequency spectrum (cymbals, strings, polyrhythmics); q7–q8 (≈224–256 kbps) for OGG archiving or when space is not a critical constraint. For most use cases (web, games, apps), q5 or q6 from a FLAC source is the optimal combination: it produces a high perceptual quality OGG with a reasonable file size.
The reduction is significant. A typical CD-quality FLAC (44.1 kHz, 16-bit, stereo) occupies 20–40 MB per song depending on content complexity. When converted to OGG Vorbis q5 (≈160 kbps), the same song takes about 6–8 MB. The reduction is approximately 70–80%. At q3 (≈112 kbps), the reduction reaches 85–90%. For large music collections, the difference can be substantial: a 100 GB FLAC library becomes approximately 15–20 GB in OGG q5, which can be critical for mobile devices, portable players, or streaming servers with limited storage.
Vorbis was designed from the start as a modern patent-free codec, and its quality at medium bitrates is generally comparable to or better than MP3 LAME and slightly below AAC-LC in most blind listening studies. At 160 kbps (q5), Vorbis outperforms MP3 at 192 kbps in most comparisons. At 128 kbps, Vorbis is clearly superior to MP3 at the same rate. Versus AAC-LC, the difference is smaller: at 128 kbps AAC may be slightly better; at 192 kbps both are practically transparent. AAC-HE outperforms Vorbis at very low bitrates (<64 kbps) thanks to SBR. Opus, the modern successor to Vorbis from Xiph.org (released 2012), clearly outperforms all of the above at most bitrates.
Yes, both come from Xiph.org, a non-profit foundation dedicated to developing open, patent-free audio and video codecs. FLAC was integrated into the Xiph.org project around 2003, though it was originally developed by Josh Coalson in 2001. Vorbis was Xiph.org's first major codec, initiated by Chris Montgomery in 1998 to create a patent-free alternative to MP3. Both are part of the Xiph toolset alongside Opus (Vorbis successor, 2012), Theora (video, 2004), and the OGG container itself. The shared philosophy is quality audio without patent restrictions or royalties, making them especially attractive for open-source projects, indie games, and Linux platform distribution.
OGG Vorbis has broad but not universal support. Natively compatible with: Android (since Android 2.3), all web browsers except Safari (which added support in 2018 via macOS High Sierra, with some limitations), VLC (all platforms), foobar2000 with component, GStreamer-based players (Linux), all games that implement it explicitly (Valve, id Software, many indie titles), and Wikipedia/Wikimedia (official format). Not natively compatible with: Apple Music, iTunes, iPhone/iOS without third-party apps, PS4/PS5, Xbox Series (limited support), and Windows Media Player without additional codecs. For maximum universal compatibility, MP3 still outperforms OGG. For the web and open-source ecosystem, OGG is an excellent choice.
Convert FLAC to OGG Vorbis: lossless to the best possible Vorbis
FLAC (Free Lossless Audio Codec) and OGG Vorbis are two creations from the Xiph.org ecosystem, though with completely different purposes. FLAC was originally developed by Josh Coalson in 2001 and adopted by Xiph.org around 2003; it is a lossless compression codec that uses a combination of linear predictive coding (LPC), Rice encoding, and MD5 integrity verification. It can compress PCM audio by 40–60% without losing any bit of information: decoded FLAC is bit-for-bit identical to the original PCM. Vorbis, on the other hand, was initiated by Chris Montgomery in 1998 with the publication of the initial specification, and stable version 1.0 was released in July 2002. It is a lossy audio codec that applies MDCT (Modified Discrete Cosine Transform), psychoacoustic auditory masking analysis, and Huffman coding to reduce file size by 70–90% compared to the original PCM, discarding information that the human ear theoretically cannot perceive. Both formats are completely patent-free and royalty-free, in contrast to MP3 (Fraunhofer/Thomson patents, expired 2017) and AAC (Via Licensing patents, still active).
The recommended practice in audio production of always encoding to lossy formats from the lossless source has a precise technical justification. When a FLAC file is decoded, the result is PCM identical to the original recording or mastering, without any compression artifacts. The Vorbis encoder receives this clean PCM and can apply its psychoacoustic model with complete freedom to determine what information is dispensable, maximizing the quality/bitrate ratio for that specific content. In contrast, when converting from MP3 to OGG Vorbis, the MP3 decoder produces a PCM that already contains the first compression's artifacts: the pre-echo typical of MP3 on transients, the 'bubbling' effect at high frequencies at low bitrates, and the quantization noise of MDCT coefficients. The Vorbis encoder cannot distinguish these artifacts from the original musical audio, and its psychoacoustic model makes suboptimal decisions when compressing an already-degraded signal. The result is an OGG that sounds worse than an OGG generated directly from FLAC at the same bitrate, even if the source MP3 had a high bitrate. For audio asset production pipelines in video games, web applications, or digital distribution, keeping masters in FLAC and generating all distribution formats from that source is the industry standard practice.
The most relevant use cases for FLAC-to-OGG Vorbis conversion concentrate in the open-source software and video game development ecosystem. In the video game industry, OGG Vorbis is the standard audio format for engines like Godot (native support since its first version), OpenAL in open-source implementations, and custom engines from studios like Valve (which has used OGG Vorbis for sound effects and music in all its games since Half-Life 2 in 2004), Blizzard Entertainment (World of Warcraft, StarCraft II), and hundreds of indie titles developed with Unity or Unreal that opt for OGG for its smaller size compared to WAV without the patent restriction of MP3. In web applications, OGG Vorbis is natively supported by the HTML5 `<audio>` element in Chrome, Firefox, and Edge, and together with AAC/MP4 in Safari covers 100% of modern browsers. For open-source music streaming servers like Ampache, Navidrome, or Jellyfin, OGG Vorbis is a first-class option. Wikipedia and all Wikimedia projects distribute their audio files exclusively in OGG Vorbis for free-licensing reasons, making it the standard format for audio in the world's largest encyclopedia. Convertir.ai performs the entire FLAC→PCM→OGG Vorbis chain in the browser via WebAssembly, without uploading files to external servers.