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FLAC to MP3 Converter

Turn FLAC files into MP3 in a couple of clicks. FLAC is losslessly compressed audio — CD quality at roughly half the size; MP3 is the universal lossy audio format. Some detail is discarded to fit the target format; how much depends on the format and your settings.

Not uploaded to any serverConverted on this deviceGone when you close the tabHow this works

Drop your files here

FLAC files (.flac) · up to 300 MB each

or paste files from your clipboard

Ready when you are

Drop a FLAC file above and FileTools360 will turn it into MP3 — right here on your device, without uploading anything.

⌘K to search converters

How to use it

  1. 1

    Add your FLAC files

    Drag them onto the drop area, choose them from your device, or paste them from your clipboard. You can queue several at once. Nothing is sent anywhere — the file stays on this device.

  2. 2

    Adjust the settings if you want to

    The defaults suit most people. Open Advanced to control bitrate, sample rate and channels.

  3. 3

    Convert and download

    Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

Privacy, in plain words

Is it safe? Your FLAC file is not uploaded anywhere

What “uploaded” normally means. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website. That copy is what the word “upload” means, and it is the part nobody explains.

What happens instead. This site does not do it. There is no server here that receives files, so your FLAC file is read, converted and handed back by the browser you are using right now. It never travels — so there is no copy to store, read, leak or hand over.

Check it yourself in ten seconds

Turn off your Wi-Fi after this page has loaded, then convert a file anyway. It still works, because everything needed is already on your device.

The longer explanation of how this works, and the full detail of what is and is not stored on the privacy page.

Why this matters more than it sounds

An audio file is a conversation. Transcribed by machine — which is cheap now — it becomes searchable text about whoever was speaking. It matters more than it sounds, because of what audio files usually are:

Call recordings

both sides of a conversation, often legally sensitive

Interviews

a source's voice is identifying even when the name is not said

Voice notes and dictation

thinking out loud, never meant for an audience

Therapy and consultation recordings

clinical material with strict handling rules

A file that is never sent cannot be kept, leaked, subpoenaed or used to train anything. That is a property of how this works, not a promise about how carefully it is run.

FLAC and MP3 explained

FLAC compresses audio losslessly, typically to about half the size of WAV. Decompressed, it is bit-for-bit identical to the original — the compression is mathematical, not perceptual.

MP3 is the lossy audio format that made digital music portable. Its patents expired in 2017, which is part of why it remains ubiquitous — anyone can implement it freely.

Where FLAC files come from
Hi-fi music libraries and archival rips of physical media.
Where MP3 is used
Music libraries, podcasts and voice recordings.

FLAC vs MP3

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

FLAC compared with MP3
PropertySourceTarget
CompressionLosslessLossy
Introduced20011993
Browser supportGreat on desktop and Android; iOS support is newer.Plays absolutely everywhere.
FLAC is stronger at
Lossless — provably identical to the source. Roughly half the size of WAV. Rich metadata and cover art support.
MP3 is stronger at
Plays on absolutely everything, including old hardware. Small files. No licensing constraints since 2017.

Why convert FLAC to MP3?

People make this switch when they run into the limits of FLAC: streaming, or converting from an already-lossy source. MP3 is the better fit when you need audio that will play anywhere, on anything, without question.

FLAC limitations that prompt the switch
Much larger than MP3 or AAC. Not supported natively by all portable devices. Pointless as a destination for already-lossy audio.
What you give up
Lossy — discarded detail cannot be recovered. Beaten on quality-per-byte by AAC and Opus.

Does converting FLAC to MP3 reduce quality?

FLAC stores your data exactly; MP3 does not. Some detail is discarded permanently in exchange for a much smaller file, which is usually the right trade for sharing and publishing. Keep your FLAC original if it is the only copy — the conversion cannot be undone.

Converting MP3 to a lossless format like FLAC does not restore quality. It produces a larger file containing exactly the same degraded audio.

Measured, not estimated

What converting FLAC to MP3 actually costs

It depends entirely on the content: across the samples the MP3 ranged from 5× smaller to 1.5× larger, with a middle case 14% smaller.

Each row is one sample chosen to isolate a property these formats treat differently.
SampleFLAC inMP3 outChange
An easy clipThe compressible end of the range — a clean tone, or a moving test pattern — where a codec does its best work.31.7 KB48.4 KB+53%
A hard clipThe other end — pink noise, or dense video grain. Close to incompressible by design, and the worst case for every codec.245 KB48.4 KB−80%

Produced by this site's own converter. The same code that runs in your browser, at the same default settings, so these are the bytes you would download.

Samples are generated from a fixed seed rather than taken from real photographs or documents, so the corpus is reproducible and carries no licensing question — and so the numbers predict the shape of your result rather than its exact size. Measured 2026-10-01. The method, and the command that regenerates every figure on this page, are on the how it works page.

About these formats

Source

Free Lossless Audio Codec

Lossless compression — CD quality at roughly half the size.

Extensions
.flac
MIME type
audio/flac
Best for
Hi-fi music libraries · Archiving · Audiophiles
Compatibility
Great on desktop and Android; iOS support is newer.

Target

MPEG-1 Audio Layer III

The universal lossy audio format.

Extensions
.mp3
MIME type
audio/mpeg
Best for
Music players · Podcasts · Maximum compatibility
Compatibility
Plays absolutely everywhere.

Going from a lossless source to a compressed format discards audio data permanently. Keep your original if it is the only copy.

Good to know

FLAC to MP3 Converter — questions

How do I convert FLAC to MP3?

Drop your FLAC file onto the area above, then press Convert. The MP3 file saves straight to your device. You do not need an account, and there is no watermark.

Is it safe to convert FLAC files here — are they uploaded to a server?

No, nothing is uploaded. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website; it is converted there and sent back. That copy is what "upload" means, and it is the part that puts your file out of your control. This site does not do it. Your FLAC file is read and converted by the browser you are using right now and never leaves this device, so there is no copy for anyone to store, read or hand over. You can prove it: turn off your Wi-Fi after this page loads and the conversion still works.

Can I convert confidential FLAC files, like bank statements or contracts?

Yes, and that is the case this site was built for. Because the file never leaves your device, a confidential document is no more exposed than it is sitting in your own folder — there is no transfer, no copy on someone else's hardware, no retention period to read about and no staff with access. Nothing is logged about the file either: not its name, not its size, not its contents. The one thing worth saying plainly is that this protects the file in transit and at rest on our side, not from anything already on your own computer.

What should I know before converting FLAC to MP3?

Going from a lossless source to a compressed format discards audio data permanently. Keep your original if it is the only copy.

Does converting to MP3 reduce quality?

MP3 uses lossy compression, so some data is discarded. At the default quality the difference is very hard to see or hear; raise the quality setting if you need to be certain, at the cost of a larger file.

How large a file can I convert?

Up to 300 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android. Pick the file from wherever your phone stores it — Files on iOS, or your downloads folder on Android. Long recordings may run out of memory on an older phone.

Read more about these formats

MP3 vs WAV: What's the Difference?

The difference is real, but converting between them only helps in one direction.

Related converters

All audio converters
MP3 → FLAC
FLAC → AAC
FLAC → AIFF
FLAC → M4A
FLAC → OGG
FLAC → Opus
FLAC → WAV
MP4 → MP3

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FileTools360 by the numbers

527 converters and tools65 file formatsnothing ever uploaded.