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Free local audio converter — no uploads

FLAC to OGG Converter — Free, Local, No Upload

The short answer: Converting FLAC to OGG trades the archive format for the web's favorite: the lossless audio is decoded and re-encoded as Opus in an Ogg container, giving you the smallest practical file that still sounds clean. It suits web apps, game engines, chat platforms, and open-source pipelines that standardized on Ogg and have no use for a multi-hundred-megabyte FLAC.

How to convert FLAC to OGG

Convert FLAC to OGG now

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

  2. Drop your FLAC 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
FLAC
Output format
OGG
Max file size
200.0 MiB
Max output
200.0 MiB
Quality
Lossy — 64–128 kbps in three tiers
Processing
Local in your browser — nothing is uploaded

FLAC

FLAC → OGG

What to watch

Opus is lossy: the converter decodes the FLAC fully and re-encodes with libopus at 64/96/128 kbps, so detail below the chosen tier is discarded — keep the FLAC as your archive. The efficiency is the point: Opus at Balanced 96 kbps is transparent for most material, so the OGG can be a tenth the size of a Quality-tier MP3 at similar fidelity. Hardware support is the trade-off. Inputs are capped at 200 MiB, outputs at 200 MiB, with a 5-minute watchdog; the ~31 MB engine downloads on first use, then stays cached.

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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 FLAC to OGG reduce audio quality?
Yes — Opus is lossy, so the conversion discards what the chosen bitrate cannot keep. The difference from other sources is the starting point: FLAC decodes to the exact original samples, so the OGG is a first-generation encode from a pristine source. And because Opus is so efficient, even the Balanced tier sounds clean where other codecs would already show artifacts.
Which bitrate should I choose for the OGG?
Opus tiers sit one step below MP3's: Compact 64, Balanced 96, and Quality 128 kbps. Balanced 96 is the sweet spot for most material; choose Quality 128 for dense music or critical listening, and Compact 64 when the file must be as small as possible.
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.