Is this FLAC to M4A converter really free?

Yes. Up to 5 files at a time, no signup, no catch. The free tier adds a small watermark to image output — Pro ($9.99/mo or $49/yr) removes it, raises the file size limit to 500 MB, and unlocks unlimited batch conversion.

Are my files uploaded to a server?

No — and you can verify it yourself. Open DevTools → Network tab, then convert a file. You'll see zero upload requests. Everything runs right in your browser. We never see your files.

How long does conversion take?

Usually 1–3 seconds for a typical file. The very first conversion on a fresh page load may take 5–20 seconds while the converter engine loads — after that it's instant. Your CPU does all the work locally.

What is the file size limit?

Free: up to 10 MB per file, 5 files per batch. Pro: up to 500 MB per file, unlimited batch. If you're working with large videos or RAW photos, Pro is built for that.

Can I batch convert multiple FLAC files at once?

Yes — drop multiple files at once (or Ctrl/Cmd+click to select them) and they all convert in parallel. Free accounts handle up to 5 files per batch; Pro has no limit.

What bitrate will the converted audio use?

We default to 192 kbps for MP3, 128 kbps for OGG/Opus, and 320 kbps for M4A/AAC. These settings are perceptually transparent — most listeners can't tell the difference in a blind test.

Will my metadata (ID3 tags, album art) be preserved?

Yes, when both formats support it. Tags carry over on conversions like MP3→M4A or FLAC→MP3. WAV has limited tag support, so some metadata may not transfer.

Will I notice a quality difference going from FLAC to M4A?

At 256 kbps AAC (M4A), most listeners cannot distinguish it from lossless in blind tests. Converting from FLAC to high-bitrate M4A is an excellent way to get Apple-compatible audio without audible quality loss.

Does converting FLAC to M4A preserve album art and metadata?

Yes — the converter transfers standard metadata (title, artist, album, track number) and embedded album art from FLAC to the M4A output.

How private is this converter?

Completely private — by design, not policy. There is no upload endpoint. Files are processed right inside your browser tab and disappear the moment you close it. We collect only anonymous page-view counts; your file content is never seen or stored.

FLAC to M4A Converter — Free, Online, No Upload

How to convert FLAC to M4A online

1
Drop your FLAC file
Drag and drop your Free Lossless Audio Codec file onto the converter, or click to browse your files. You can select up to 5 at once. Nothing leaves your device — conversion happens right here in the browser.
2
Hit Convert — it happens locally
Click Convert and watch it go. There's no upload, no server queue, no waiting. The converter runs Free Lossless Audio Codec → MPEG-4 Audio entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your M4A
Your MPEG-4 Audio file is ready. Click Download, or grab a ZIP if you converted a batch. Close the tab and everything disappears — no copies kept anywhere.

FLAC vs M4A: format overview

FLAC

Free Lossless Audio Codec

Josh Coalson / Xiph.Org · 2001

Compression: lossless
Transparency: No

✓ Lossless compression — identical to source
✓ 50–60% smaller than WAV with no quality loss
✗ Not supported on iOS/iTunes natively

M4A

MPEG-4 Audio

Apple / MPEG Group · 2001

Compression: lossy
Transparency: No

✓ Better quality than MP3 at same bitrate (AAC codec)
✓ Native Apple ecosystem support

FLAC magic bytes: 66 4C 61 43

M4A magic bytes: 00 00 00 xx 66 74 79 70 4D 34 41

Why convert FLAC to M4A?

FLAC is ideal for archiving and audiophile playback, but it's a nonstarter on iPhones, iPads, and iOS-based devices. Apple's audio stack doesn't support FLAC natively in the Music app or standard iOS media player — if you try to add a FLAC file to iTunes or sync it to an iPhone, it simply won't appear. M4A (AAC in an MPEG-4 container) is Apple's native audio format and plays everywhere in the Apple ecosystem without any friction.

Converting FLAC to M4A bridges the lossless archive world and Apple's device ecosystem. At 256 kbps AAC — the setting Apple uses for iTunes Store purchases — the M4A output is indistinguishable from lossless in double-blind listening tests for essentially all listeners. The file will be roughly 85% smaller than the FLAC source. The result syncs to iPhone and iPad, appears in iTunes with full album art and metadata, uploads to Apple Music for iCloud library sync, and works with CarPlay.

Because you're encoding from a lossless FLAC master, this is the cleanest possible M4A encode — no prior generation loss, no compounding of codec artifacts. Logic Pro, GarageBand, and all Apple audio tools treat M4A as a primary import format. For podcasters, M4A is widely accepted by Apple Podcasts, Spotify, and major podcast hosting platforms.

Quality & file size: FLAC to M4A

Typical file sizes: FLAC 20–40 MB → M4A 3–6 MB.

Converting from lossless FLAC to lossy M4A will apply compression. We default to 85% quality — visually indistinguishable from the original for most content. If you need pixel-perfect output, consider using a lossless target format instead.

Color depth: FLAC supports standard color, M4A supports standard color.

Transparency: FLAC does not support transparency. M4A does not support transparency — transparent areas become solid white.

Frequently asked questions

Privacy: how FormatDrop handles your files

Your FLACfiles are converted 100% inside your browser. They are never uploaded to our servers, never stored, and never seen by anyone other than you. This isn't a privacy policy claim — it's an architectural guarantee: our server has no endpoint that receives file bytes.