FLAC (Free Lossless Audio Codec) is the audiophile's format of choice. It stores audio in bit-perfect lossless compression — every sample is exactly as it was in the studio master. CD-quality FLAC is indistinguishable from the original recording because it literally is the original data, just compressed losslessly. The downside: FLAC files are large. A single album is typically 300–700 MB. Your iPhone doesn't support FLAC natively. Spotify doesn't accept FLAC uploads. Your car's USB audio system probably doesn't read FLAC. Converting to MP3 makes your music library portable without sacrificing meaningful quality for everyday listening.
FLAC vs MP3 — The Honest Quality Comparison
Audiophiles fight about this constantly. Here's what blind listening tests actually show:
- FLAC at any bitrate: Lossless. Every sample identical to the original. Scientifically superior to MP3.
- MP3 at 320 kbps: In controlled blind listening tests (ABX tests), the vast majority of listeners cannot reliably distinguish MP3 320 from FLAC, even on high-end equipment. The term for this is "transparent" — the compression is inaudible.
- MP3 at 192 kbps: Transparent to most listeners on consumer-grade headphones and speakers. Some audiophiles can detect differences on high-resolution headphones with very dense musical content.
- MP3 at 128 kbps: Audible quality loss on complex music, particularly in cymbals, reverb tails, and high-frequency content. Fine for podcasts and speech.
- Bottom line: 320 kbps for music you actually care about, 192 kbps for background listening.
Why No-Upload Conversion Matters for FLAC
FLAC files are massive — a single album can be 400–700 MB. Uploading that to an online server converter on a standard home connection takes 5–10 minutes before conversion even starts. Then you wait in their processing queue. Then you download the result. The whole process can take 20+ minutes per album. Convifi converts entirely in your browser, starting immediately. For a typical 5-minute FLAC track, conversion to MP3 takes about 30–60 seconds on a modern laptop. Your music stays on your device the entire time.
How to Convert FLAC to MP3 Free
- Go to convifi.com/convert/flac-to-mp3
- Click "Select File" and choose your FLAC track
- The converter decodes the FLAC audio and encodes to MP3
- Download the MP3 — ready for your phone, car, or streaming upload
FLAC on iPhone and Apple Devices
iPhones running iOS 11 and later can actually play FLAC files if you add them via Files — Apple added FLAC playback support in iOS 11. However, the Music app still doesn't import FLAC, and AirPlay doesn't stream FLAC. For universal compatibility with Apple Music and all Apple devices, convert to either ALAC (Apple Lossless — keeps perfect quality, Apple-native format) or MP3 (smaller, works everywhere). Convifi handles FLAC to MP3. For FLAC to ALAC, you'll need a desktop tool like XLD on Mac or fre:ac on Windows.
FLAC to MP3 for Spotify and Streaming Services
Spotify, Apple Music, Amazon Music, and other streaming services don't accept FLAC uploads for personal libraries. If you use any service's 'Local Files' or 'My Music Upload' feature, you'll need MP3 or AAC. Convert your FLAC collection to MP3 at 320 kbps and you'll have files that are fully compatible with every streaming service's import feature.
Should You Delete the FLAC After Converting?
Never — keep your FLAC files as the master archive. Think of FLAC as the master tape and MP3 as the cassette copy you use on the go. Storage is cheap (a 1 TB external drive costs about £40 and holds your entire music library in FLAC with room to spare). If compression algorithms improve in the future, you'll want the lossless originals to generate higher-quality copies from. Delete nothing.
Batch Conversion for Large Libraries
The browser converter handles one file at a time, which is fine for occasional use. If you need to convert an entire FLAC library of hundreds of albums, a desktop batch converter is more practical. On Mac, XLD is the gold standard — it preserves metadata, handles album art, and processes entire folders. On Windows, fre:ac is excellent and free. On Linux, ffmpeg with a bash script is the most efficient method.
for f in *.flac; do ffmpeg -i "$f" -ab 320k "${f%.flac}.mp3"; done