What is an FLAC file?

The FLAC format in brief: what it is, what it is used for, and how to convert it.

FLAC: conversion steps

  1. Upload your FLAC file to start.
  2. Convert FLAC to AAC.
  3. Download the FLAC file.

About FLAC files

a lossless compressed audio format

FLAC (Free Lossless Audio Codec) compresses audio without losing anything: the files are typically half to two thirds the size of WAV and decode back to the exact original samples.

Music archives, CD rips and high-resolution downloads.

FLAC: what conversion changes

Converting FLAC re-encodes audio.

FLAC: settings to change

Before you convert FLAC files, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.

Limits of the FLAC format

FLAC files are several times larger than MP3, and some older players and car stereos do not play them.

Common questions about FLAC

Why would anyone use FLAC when MP3 is so much smaller? FLAC stores the audio bit-for-bit with no loss at all, which matters for archiving and re-editing — the price is a file several times larger.

Why convert CDs to FLAC instead of MP3? The copy is bit-for-bit identical to the original, so the archive never loses quality however often it is converted later.

Does the iPhone play FLAC files? iOS and macOS read FLAC through the Files app and Music, Windows 10 and 11 play it natively, and Android supports it too. Older car stereos and some hardware players still expect MP3, where a copy in MP3 is the safer bet.

Convert FLAC files

Guides and tools for FLAC