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home/audio/flac-to-mp3

Convert FLAC to MP3 Online Free

Your lossless library won't fit on the phone. MP3 copies will.

Keep the FLAC files at home as your master copies, and make a lighter MP3 set for the device. Pick where it's going and a bitrate: see how much of your collection comes along.

your flac library182 GB · 6,600 tracks
albums600
going tophone_iphone128 GB phoneabout 80 GB free for music80 GBdirections_car32 GB USB stickfor the car30 GBwatchSmartwatchoffline music · 8 GB6.0 GBsd_card256 GB SD carddedicated music player238 GB
after convertinghome_storageFLAC masters stay at home182 GBsyncMP3 set on the phone53 GB
mp3 bitrate
128small192good256great320maxV0VBR ~245
128 GB phone · 80 GBwhole library fits · 27 GB spare
albums that fitleft at homefree space
FLAC library182 GBlossless · 900 kbps average
MP3 at 256 kbps53 GB3.4× smaller
Shrink cover art to 600 pxScans can be 3 MB each: 600 px is plenty for any screenKeep ReplayGainAlbums play at the same volume without touching the audio
library_musicConvert 600 albums to MP3

Open songs, voice memos or old archives and save them as MP3, AAC, FLAC, Opus, WMA, AC3, AMR or any of 19 more. Pick a quality preset or an exact bitrate, convert the whole batch in one pass, then download each file or one ZIP.

music_noteTry a sample track
lockFiles stay on your devicelibrary_music26 output formatsstacksBatch convert, one ZIPtunePresets or an exact bitrate
Your filesempty
upload_fileDrop audio files hereMP3, WAV, FLAC, M4A, OGG, OPUS, WMA, AIFF, AMR, AC3 and more. Add as many as you like; they convert one after another.
swap_horizConvert the sample to .mp3folder_zip
The FFmpeg engine (about 31 MB) downloads on your first conversion and runs on this device.
1Save as26 formats
.mp3.m4a.wav.flac.opus
searchAll 26 formatsexpand_more
search
. ·
.mp3MP3
MPEG-1 Audio Layer III, the universal standard. Best for music, podcasts and sharing.
Containermp3Encoderlibmp3lameMIME typeaudio/mpegFirst bytes49 44 33 or FF FBHerechecked when the engine loads
2Qualitylossy · smaller
Low96 kbps · 44.1 kHz · mono
Medium128 kbps · 44.1 kHz · stereo
High192 kbps · 48 kHz · stereo
Ultra320 kbps · 48 kHz · stereo
Customset it yourself
Bitrate
Bit depth
Sample rate
Channels
infoEach preset sets bitrate, sample rate and channels together. MP3 at 192 kbps is the usual choice for music.
3What you’ll getexample
a 3-minute stereo track3:00≈ 4.32 MB
The exact command each file goes throughffmpeg -i input.wav -vn -map_metadata 0 -ar 48000 -ac 2 -c:a libmp3lame -b:a 192k -f mp3 output.mp3
swap_horizConvert the sample to .mp3
~/can-you-hear-it

Most people can't pick lossless from 256 kbps.

In controlled listening tests (where you don't know which is which), trained listeners start guessing at chance somewhere between 192 and 320 kbps. Your equipment matters more than the file: pick where you listen to see the point beyond which extra bitrate buys nothing.

headphonesEarbuds on the busspeakerHome speakerheadsetGood headphones, quiet roomgraphic_eqStudio monitors
96 kbpsdifference audible
128 kbpsdifference audible
192 kbps← threshold
256 kbpsno audible gain
320 kbpsno audible gain
FLACno audible gain
Room reflections soften detail. Most people can’t tell 192 kbps from the FLAC.
~/24-bit-96-khz

Hi-res FLACs get folded down first.

Studio downloads often come at 24-bit and 96 or 192 kHz. MP3 only goes up to 48 kHz, so those files are resampled to 44.1 kHz and dithered to 16-bit before encoding. The extra data describes sound above human hearing, so nothing audible is lost at this step.

01Studio FLAC · 24-bit · 96 kHz≈ 3,300 kbpsFour times the data of a CD. Most of it describes frequencies up to 48 kHz: far above hearing.
02Resampled · 16-bit · 44.1 kHz1,411 kbpsConverted to CD resolution with a high-quality filter. Everything you can hear is kept.
03Dithered · noise-shapedinaudibleA tiny, carefully shaped noise hides rounding errors from going 24 → 16 bits.
04Encoded · MP3 · 256 kbps256 kbpsThe encoder works from a clean CD-quality signal, just like converting a normal FLAC.
~/what-comes-along

FLAC tags speak a different language from MP3's.

FLAC stores song info as simple “Vorbis comments”; MP3 players read ID3 frames. Everything useful has a direct match, including the loudness data that stops one album sounding louder than the next. Huge 3000-pixel cover scans are the one thing worth shrinking.

Title & artistHarbour Road · The Harbour LightsTITLEARTISTarrow_forwardTIT2TPE1
Album & album artistSummer Tour · VariousALBUMALBUMARTISTarrow_forwardTALBTPE2
Track & disc number4 / 12 · disc 1TRACKNUMBERDISCNUMBERarrow_forwardTRCKTPOS
Year & genre2026 · IndieDATEGENREarrow_forwardTDRCTCON
Cover art3000 px → 600 pxPICTURE blockarrow_forwardAPIC
Loudness (ReplayGain)album −6.2 dBREPLAYGAIN_*arrow_forwardTXXX
Lyricsfull textLYRICSarrow_forwardUSLT

Frequently Asked Questions

Is converting FLAC to MP3 free?

Yes, FLAC to MP3 conversion is completely free with no signup, no watermark, and no usage limit. Convert as many files as you need.

Are my files uploaded to a server?

No. The FLAC to MP3 converter runs in your browser when your file is supported there, so the file stays on your device for that workflow, reducing server exposure for that workflow. Look at the processing mode before putting anything confidential through it.

How long does FLAC to MP3 conversion take?

Most FLAC to MP3 conversions finish in under a minute. A large file takes longer in proportion, though the work happens on your machine, so nothing waits on a sign-up.

Will the conversion reduce file quality?

Depends which formats. Lossless in, lossless out, and the file you get back is identical. Convert to something compressed and you trade a little quality for a smaller file, which is usually the trade you wanted.

Does this work on mobile devices?

Yes. The FLAC to MP3 converter works on phones, tablets, and desktops in any modern browser including Chrome, Safari, Firefox, and Edge.