OGG to FLAC Converter

OGG vs FLAC — Which Should You Convert To?

Both formats come from the Xiph.Org Foundation and both are royalty-free, which is why they are so often confused. They are not interchangeable. The Vorbis codec inside a typical .ogg is lossy: it discarded audio data at encode time to get small. FLAC is lossless: it compresses without discarding anything, and decodes back to the exact samples it was given.

So the short answer is: converting .ogg to .flac does not make the audio better, and it will make the file bigger. It is still the right move when a library, player or editing tool insists on a lossless format and refuses Vorbis — which is common, because FLAC is supported far more widely on hardware than Ogg Vorbis is. Do it for compatibility and for a stable master you can edit without stacking further lossy generations, not for fidelity.

Side-by-side Comparison

When to Stay on OGG

• The file is only ever going to be played, not edited, and size matters.
• It is game or web audio where Vorbis is the expected format anyway.
• You are sharing it — a FLAC of the same content is several times larger for zero audible gain.
• You would only be converting because "lossless sounds better", which it does not when the source is already lossy.

When to Convert to FLAC

• A media server, player or DAP accepts FLAC and rejects .ogg outright.
• You want one consistent format across a library that is otherwise lossless.
• The audio is about to be edited repeatedly, and you want each save to be sample-accurate rather than another lossy generation.
• You need embedded cover art that survives reliably, which FLAC's picture metadata block handles better than a bare Ogg stream.
• A tool in your chain reads FLAC but not Vorbis — this is the single most common real reason.

How to Convert OGG to FLAC

1. Upload Your OGG File: Drag the .ogg onto the page or click "Add Files" to browse. Several files can be queued and converted with the same settings in one batch.
2. Set the Compression Level: The Compression level slider runs from 1 to 12 and opens at 12. It changes file size and encode time only — every level is lossless and decodes to identical audio, so lower it if you want a large batch to finish faster.
3. Adjust Channels, Sample Rate or Trim (Optional): Leave Audio Channel and Audio Sample Rate on Original to copy the source exactly, which is what you want for an archive. Trim exports a start time and a duration instead of the whole track — note the duration field opens at 10 seconds.
4. Convert and Download: Click Convert and save the .flac. Files are uploaded over an encrypted connection, converted on our servers and deleted automatically after a few hours — no sign-up, no watermark.

There is no bitrate or quality control on this page and there should not be: FLAC has no quality parameter to set. The only size lever is the compression level, and it never touches the audio.

What the Compression Level Slider Actually Changes

The gains taper sharply — most of the size reduction is already achieved by the middle of the range, and the top levels buy a small extra percentage for a large increase in encode time. Since the source here is already lossy, the absolute savings are modest either way: Vorbis has removed most of the redundancy FLAC would otherwise exploit.

Frequently Asked Questions

Does converting OGG to FLAC recover the quality Vorbis threw away?

No, and no tool can. Vorbis is a lossy transform codec — at encode time it permanently discarded detail it judged inaudible. FLAC then losslessly preserves whatever it is handed, which is the already-reduced audio. The result is a bit-perfect copy of a lossy recording in a much larger file. The only way to get genuine lossless audio is to encode from a lossless source; if you have the original, WAV to FLAC is the conversion that is lossless end to end.

Why is my FLAC several times larger than the OGG it came from?

Because the two formats target completely different things. Vorbis reaches its size by deleting audio data; FLAC reaches its size by finding mathematical redundancy and keeping every sample. A lossy file has already had most of that redundancy removed, so FLAC has little left to exploit and the output lands much closer to raw PCM than to the Vorbis original. The exact multiple depends on the bitrate the .ogg was encoded at — low-bitrate sources expand the most.

Is FLAC actually lossless if the input was lossy?

Yes, in the precise technical sense: the FLAC decodes back to exactly the samples that came out of the Vorbis decoder, bit for bit. What it is not is a lossless copy of the original recording, because that chain was broken the moment the .ogg was encoded. Both statements are true at once, and confusing them is where "upconverting" myths come from.

What does the Compression level slider do to my audio?

Nothing. It only changes how hard the encoder searches for a compact representation. Levels 1 and 12 produce files of different sizes that decode to identical audio — you can verify this by comparing checksums of the decoded PCM. Higher levels take longer to encode and are slightly smaller; the audio is untouched at every setting.

Will my title, artist and album tags survive?

Usually, because both formats use the same tagging system — Vorbis comments, a free-form set of key/value pairs. Standard fields such as TITLE, ARTIST, ALBUM and DATE map straight across. Embedded artwork and unusual custom fields are the most likely things to differ, since FLAC stores pictures in a dedicated metadata block rather than as a comment. Check them in your player after converting if exact tag fidelity matters.

Which devices and browsers actually play FLAC?

Support is broad on both fronts. MDN lists FLAC as playable in Chrome, Edge and Opera, in Firefox 51 and later on desktop, and in Safari 11 and later — noticeably wider than Ogg Vorbis, which Safari does not support at all. On hardware, most modern digital audio players, network streamers and phones handle FLAC, though some budget car head units and older devices still do not. Check for "FLAC" in the specification sheet before assuming it works.

Should I convert my whole OGG library to FLAC for archiving?

Only if a tool in your chain requires it. Storing a lossy library as FLAC multiplies your storage for no audible benefit — the quality ceiling was fixed when the Vorbis encode happened. A real lossless archive starts from CDs, uncompressed masters or lossless downloads. If you want a smaller library instead, compress-flac and the Audio Compressor work the other direction.

Can I go back to OGG afterwards if the FLAC is too big?

Yes, with FLAC to OGG — but understand what that does. Encoding a lossy-derived FLAC back to Vorbis is a second lossy generation, so it will sound slightly worse than the .ogg you started with. If both files exist, keep the original .ogg rather than round-tripping. Round-trip only when the original is genuinely gone.