Step 1: Provide your AC3 files using the button above or by toss and let go.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Fetch your converted FLAC files.
AC3 to FLAC Conversion FAQ
What bitrate does the FLAC file end up at?
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A lossy FLAC is encoded at 192 kbps by default. The Audio Quality setting also offers 320 kbps for the best quality and 128 kbps for a smaller file. A lossless FLAC (WAV, FLAC) ignores the bitrate and keeps every sample.
Does converting AC3 to FLAC improve the audio quality?
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No, and it is worth being blunt: nothing can. The AC3 already discarded detail during its original encode, and wrapping what remains in a lossless FLAC preserves exactly that — no more. The file gets several times larger and sounds identical. It is still the right move before editing, because FLAC will not add a second generation of artefacts when you export. FLAC gives you WAV fidelity at half the size, with proper metadata tags and embedded artwork, which is why it dominates lossless music libraries. AC-3 is inefficient by modern standards and is not accepted by browsers, phones or most web players without a downmix to stereo.
Can I tag the FLAC with artist and album information?
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Yes, and it is a genuine gain over AC3, which has nowhere dependable to store any of it. FLAC carries title, artist, album, year, track number and embedded cover art in the container itself, so a music library files it correctly without a manual pass.
Will the FLAC play in my car or on older hardware?
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Often not. AC3 is decoded by essentially everything, including car head units and elderly players; FLAC needs software that knows the codec, which standalone hardware frequently does not have. If the destination is a car stereo or a portable player, that is a strong argument for staying on AC3. FLAC is still several times larger than a good lossy file, and Apple’s ecosystem only added support recently and grudgingly.
Will going from AC3 to FLAC actually reduce my audio quality?
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If AC3 is lossy (MP3, AAC) and FLAC is lossless (WAV, FLAC), the FLAC is no better than the AC3 — you cannot recover information already discarded by the lossy AC3 codec. If AC3 is lossless and FLAC is lossy, expect the FLAC encoder to recompress; at 192 kbps the loss is imperceptible to most ears.
Can I batch-convert hundreds of AC3 files into FLAC?
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Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.
Can I normalize loudness in the AC3 to FLAC step?
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Not in this step. The converter has no loudness setting and leaves the level as it is. To even out the volume, run the finished FLAC through a Normalize tool on this site.
Will the FLAC play on my car stereo / iPod / Sonos / Bluetooth speaker?
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MP3 plays almost everywhere. AAC plays on Apple devices, most Android phones and Sonos. FLAC plays on Sonos and Android but not on older iPods, and WAV plays on nearly everything but makes large files. There are no device presets on this page, so choose the target format your player supports.
Is my AC3 file private during conversion?
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Yes. Uploaded AC3 files are processed on our own conversion servers, no person reviews them, and they are never shared. The upload and the converted FLAC are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.
