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Convert FLAC to MP3

Convert FLAC to MP3 directly in your browser with local processing and no audio upload to a server.

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FLAC file

FLACMP3
Your audio stays on your device.

Drop your FLAC file here

Or choose it from your device.

Conversion runs locally in your browser with Bethemesh’s shared audio engine.

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How does this tool work?

Convert a FLAC file to MP3 directly in your browser to create a smaller, easier-to-share copy while keeping the FLAC original as your lossless source.

FLAC compresses audio losslessly, while MP3 uses lossy compression. Bethemesh decodes the FLAC and encodes it as MP3 with FFmpeg/WASM. The result is usually much smaller, but some information is discarded during MP3 encoding, so keep the FLAC when you need an archival or master-quality source. This specialist page accepts .flac filenames and locks output to MP3 at 192 kbit/s. Unlike the general converter there is no destination choice, and unlike audio compression there is no bitrate control. Lossless describes the FLAC source, not the resulting MP3 copy. The engine decodes and then performs lossy encoding. Space saved depends on source properties, duration and metadata. A high-resolution source is not preserved as an archival master in MP3. Artwork, comments and FLAC-specific fields are not guaranteed to survive. Keep your FLAC when preparing versions for several delivery formats.

How to use this tool

  1. Select the FLAC master

    Choose the .flac track and keep it in your archive.

  2. Encode the MP3 copy

    Run conversion of decoded audio at 192 kbit/s.

  3. Check the delivery version

    Listen and inspect its tags before transferring it.

Convert FLAC to MP3 — Calculation reference

S ≈ 1000 × R × t / 8

S
Estimated bytes, excluding tags and container
R
Bitrate in decimal kbit/s
t
Duration in seconds

Use cases

A player without FLAC

Make an MP3 copy for hardware that rejects your FLAC archive.

Share an album

Distribute listening copies while keeping lossless masters in place.

Travel listening

Take smaller MP3 versions with you and retain the FLAC collection.

Examples

A four-minute track

192,000 × 240 ÷ 8. FLAC source size is not part of this calculation and varies with its signal and settings.

Input

240-second FLAC, MP3 at 192 kbit/s

Result

About 5,760,000 audio bytes

A ten-minute copy

Duration and estimated payload are 2.5 times the first example. Tags and headers add overhead.

Input

600 s at the same MP3 bitrate

Result

About 14,400,000 bytes

Tips and best practices

  • Keep more than MP3 copies of an important FLAC collection.
  • Inspect cover art and comments; cross-format metadata transfer is not guaranteed.
  • Start from FLAC again when preparing several bitrates.

Sources and references

Frequently asked questions

Does my FLAC archive leave my device?

FLAC decoding happens on your device. Downloading the engine uses the network, but the sound archive is not uploaded.

Why make MP3 from FLAC?

An MP3 copy can play on hardware without FLAC support and use less space, at the cost of irreversible loss.

Does MP3 retain the FLAC master’s resolution?

It does not retain a lossless master. Source information is re-encoded according to the MP3 codec.

Can the MP3 replace my FLAC archive?

Keep FLAC if you need a lossless source. MP3 is a delivery copy and cannot reconstruct information removed during its encoding.

How can I choose a bitrate other than 192 kbit/s?

Use audio compression with the original FLAC. This page has no bitrate setting; recompressing the generated MP3 adds another lossy generation.

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