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Free local audio converter — no uploads

OGG to FLAC Converter — Free, Local, No Upload

The short answer: Converting OGG to FLAC archives Opus audio in lossless compression: the file grows several times larger and holds exactly the decoded samples, tagged and checksummed. It suits collectors unifying a mixed library into one lossless format, or anyone who wants a stable master of a recording whose only copy arrived as Ogg — with no further quality loss from that moment on.

How to convert OGG to FLAC

Convert OGG to FLAC now

The button opens the Audio Converter with OGG → FLAC preselected — it runs entirely in your browser and nothing is uploaded.

Open Audio Converter

Local in your browser — nothing is uploaded

  1. Open the converter

    The button above opens the Audio Converter with the FLAC output already selected.

  2. Drop your OGG file

    Add the file (up to 200.0 MiB); the format is verified from its signature, not its name.

  3. Convert and download

    Press Convert; the ffmpeg audio engine (~31 MB) downloads on first use, then your file transcodes in a dedicated worker. Cancel stops the run cleanly.

Conversion facts

Input format
OGG
Output format
FLAC
Max file size
200.0 MiB
Max output
200.0 MiB
Quality
Lossless — bitrate tiers ignored
Processing
Local in your browser — nothing is uploaded

OGG

OGG → FLAC

What to watch

The container is lossless but the audio is the decoded Opus: the FLAC is an honest snapshot of the current quality, not a restoration — Opus's discarded detail stays discarded. Expect a big size jump, since losslessly storing already-compressed audio saves little. Sample rate and channel count pass through as decoded. Inputs are capped at 200 MiB and outputs at 200 MiB, with a 5-minute per-run watchdog; the ~31 MB engine downloads on first use, then stays cached on your device.

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  • The tool behind this page

    Audio Converter

    Convert MP3, WAV, M4A, OGG and FLAC audio between formats entirely in the browser with ffmpeg.wasm — no uploads. Inputs up to 200 MB with 96/128/192 kbps bitrate tiers for lossy output; OGG uses Opus and WAV/FLAC stay lossless.

Frequently asked questions

Will converting OGG to FLAC improve the audio quality?
No — FLAC stores exactly what the Opus decoder produces, bit for bit. What you gain is archival stability: proper tags, integrity checksums, and a format that will not degrade through future conversions. The quality ceiling stays wherever the original Opus encode left it.
Which bitrate should I choose for the FLAC?
None — FLAC is lossless, so the bitrate tier selector stays visible but the encoder ignores it, and the workspace says so. The output size follows the decoded audio's sample rate, channel count, and duration, which is why the FLAC is typically several times larger than the OGG it came from.
Are my audio files uploaded anywhere?
No. Decoding and encoding run in a WebAssembly build of ffmpeg inside your browser tab — the file never leaves your device, nothing is uploaded or stored on a server, and closing the tab discards everything.