Home › Tools › Audio Tools › FLAC to MP3 Converter

FLAC to MP3 Converter — Free Online

Live

Upload a lossless FLAC file and convert it to high-quality MP3 instantly. No signup, no watermark.

Last updated July 1, 2026

Drop a FLAC file here

or click to browse · max 50 MB

Related Audio Tools

MP3 to WAV

Convert any MP3 to uncompressed WAV online.

WAV to MP3

Compress any WAV file to high-quality MP3 online.

Audio Trimmer

Cut any MP3 or WAV file to a precise clip online.

FLAC is the archival format of choice for music collectors, recording engineers, and audio archivists. A single album track encoded as FLAC typically runs 25–50 MB; a full album is 300–600 MB. That size makes FLAC impractical for car audio systems, portable players that only support MP3, and email or messaging attachments. Converting FLAC to MP3 bridges the archive to every playback context that doesn't support lossless audio. Converting from FLAC to MP3 is a one-generation encode: the lossless FLAC source gives the MP3 encoder access to the complete original audio before any psychoacoustic compression has been applied. This produces higher-quality output than converting from an existing MP3, where you are applying lossy compression to already-compressed audio. The FLAC itself is not modified; the original archive file stays intact. The AT USE FLAC to MP3 Converter processes files server-side using FFmpeg with the LAME MP3 encoder at VBR quality preset 2, targeting a dynamic average of approximately 170–210 kbps. The encoder uses a psychoacoustic masking model to allocate bits where they matter most — more to complex transients and harmonic-dense passages, fewer to sustained notes and silence — producing transparent-quality output that most listeners cannot distinguish from the lossless original on typical playback equipment. Files are deleted from the server immediately after your download completes. FLAC uses Vorbis Comment metadata. Standard fields — TITLE, ARTIST, ALBUM, TRACKNUMBER, DATE, GENRE — are remapped to ID3v2.3 tags in the output MP3. This mapping works reliably for standard Vorbis Comment keys. Custom tags with no ID3v2.3 equivalent may not transfer. FLAC supports sample rates up to 655 kHz and bit depths up to 32 bits. MP3 supports a maximum sample rate of 48 kHz. Source FLAC files at 88.2 kHz, 96 kHz, or 192 kHz are resampled to 48 kHz before encoding. The resampling step is handled by FFmpeg's high-quality SoX resampler (swr library), which applies an anti-aliasing filter before downsampling to prevent aliasing artifacts. Source files at 16-bit or 24-bit depth are handled without issue; bit depth is irrelevant to the MP3 output since LAME encoding operates independently of source bit depth beyond its effect on dynamic range.

Common use cases

Music collector to car audio or MP3-only device — Listeners who maintain FLAC libraries for home listening need MP3 copies for car stereos, older iPods, gym MP3 players, and in-flight entertainment systems that accept only MP3 USB drives. Converting FLAC to MP3 at VBR quality 2 produces files that are indistinguishable from the lossless original on car speakers or budget headphones while being 70–80% smaller than the FLAC source.
Musician sending demos to collaborators and labels — Recording sessions are tracked and mastered to FLAC for archival purposes. When sending demo tracks to collaborators, producers, or labels for review, FLAC files are often impractical — too large for email, unfamiliar to industry contacts, and sometimes incompatible with older Pro Tools installs. Converting to MP3 before sending gives recipients immediate playback in any media app without needing FLAC decoder support.
Podcast production from high-quality interview recordings — Interview sessions recorded to FLAC for archival quality are converted to MP3 for the actual podcast upload. Podcast distribution platforms (Anchor, Buzzsprout, Libsyn) accept MP3 and impose per-episode file-size limits. A 90-minute FLAC interview at 44.1 kHz/16-bit stereo is approximately 900 MB; converted to 190 kbps MP3, it drops to under 130 MB while retaining voice intelligibility at full broadcast quality.
Audio engineer stem delivery for clients — Audio engineers delivering final mixes and stems to clients frequently send FLAC for archival quality. Clients who need quick review copies — for approval before final delivery, or for sharing internally — request MP3 because FLAC playback requires media players that support lossless formats, which many marketing or creative departments don't have configured. Providing both formats from a single FLAC source avoids re-exporting from the DAW.
DJ library preparation from vinyl rips — Vinyl rips and high-quality needle-drop recordings are saved as FLAC to preserve the full dynamic range captured during digitization. DJ software (Serato, Rekordbox, Traktor) supports FLAC but some DJs prefer MP3 for cross-compatibility with CDJ hardware at venues. Converting the FLAC archive to MP3 at high VBR bitrate produces DJ-ready tracks while the uncompressed FLAC remains available for future re-edits or re-masters.

Frequently asked questions

Is converting from FLAC better than converting from MP3?

Yes, for audio quality. FLAC is lossless — it stores every sample from the original recording. When you encode FLAC to MP3, the LAME encoder processes the original uncompressed audio and makes its own decisions about what to discard based on psychoacoustics. When you encode MP3 to MP3, the encoder applies lossy compression to audio that has already been compressed, which amplifies compression artifacts. Starting from FLAC at the same output bitrate consistently produces higher-quality MP3 output than converting from an existing MP3.

What happens to FLAC files recorded at 96 kHz or 192 kHz?

The audio is resampled to 48 kHz before MP3 encoding. MP3 supports a maximum sample rate of 48 kHz. FFmpeg's SoX resampler applies an anti-aliasing low-pass filter before downsampling to prevent aliasing artifacts from frequencies above the Nyquist limit of the output sample rate. The perceptible audio content — everything below 24 kHz — is preserved through the resample step.

Will FLAC metadata like album art transfer to the MP3?

Standard Vorbis Comment fields — TITLE, ARTIST, ALBUM, TRACKNUMBER, DATE, GENRE — are remapped to ID3v2.3 tags in the output MP3 and transfer reliably. Embedded album art stored as a Vorbis picture block transfers to an ID3v2.3 APIC frame in most cases. Custom or non-standard Vorbis Comment keys that have no ID3v2.3 equivalent may not appear in the output.

My FLAC is larger than 50 MB. What should I do?

Trim the audio to the portion you need before converting, or split a long recording into shorter segments first. A 50 MB limit accommodates approximately 8–10 minutes of stereo 16-bit/44.1 kHz FLAC, or about 5 minutes of 24-bit/96 kHz stereo FLAC. Use a free audio editor (Audacity, ocenaudio) to trim or split before uploading.

Does converting FLAC to MP3 modify the original FLAC file?

No. The FLAC file you upload is read for conversion and then deleted from the server after your download. The conversion is non-destructive — the file on your local storage is never altered. The MP3 is a new independent file; the FLAC archive remains unchanged on your machine.