Will quality be lost?

Yes — MP3 is lossy. At 256 kbps or higher the loss is generally inaudible. For listening to lossless masters keep FLAC.

Why convert FLAC to MP3?

For phones, car stereos, Bluetooth speakers, and older players that don't understand FLAC, plus to save space — MP3 files are usually 4–5× smaller.

No. ffmpeg.wasm decodes and re-encodes locally; nothing leaves your device.

ロスレスFLACをMP3に変換。ビットレート調整可能。アップロード不要。

100% in your browser. Your file never leaves your device.

FLAC audio file

MP3 bitrate

Pick a FLAC file to begin.

Phone-friendly music libraries: save 75–80% of storage vs. FLAC at near-transparent quality.
Old car stereos: many car decks decode MP3 but not FLAC over USB.
Email / messaging: MP3 is universally accepted as an audio attachment.

Will quality be lost?: Yes — MP3 is lossy. At 256 kbps or higher the loss is generally inaudible. For listening to lossless masters keep FLAC.
Why convert FLAC to MP3?: For phones, car stereos, Bluetooth speakers, and older players that don't understand FLAC, plus to save space — MP3 files are usually 4–5× smaller.
Are my files uploaded?: No. ffmpeg.wasm decodes and re-encodes locally; nothing leaves your device.

Last updated: 2026-05-20 By jarvisbox