Step 1: Transfer your FLAC files using the button above or by slide and deposit.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Retrieve your converted AC3 files.
FLAC to AC3 Conversion FAQ
What bitrate will the resulting AC3 file use?
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A lossy AC3 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 AC3 (WAV, FLAC) ignores the bitrate and keeps every sample.
How much quality do I lose converting FLAC to AC3?
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Some, and it is permanent — this is the one direction where information is genuinely thrown away. FLAC holds every sample exactly; AC3 discards what a psychoacoustic model predicts you will not hear. At 192 kbps and above that prediction is good enough to be transparent on most material and most equipment. Keep the FLAC as your master, because you cannot get back to it from the AC3. FLAC uses linear prediction plus Rice coding to reach roughly 50-60% of the original size while decoding back to bit-identical PCM. AC-3 is lossy multichannel audio, normally 5.1 at 384 or 448 kbps, with metadata for dialogue normalisation and downmixing.
Will my track titles and album art survive the FLAC to AC3 conversion?
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Not intact. FLAC carries a proper metadata block, but AC3 has no standard place for artist, album, track number or cover art, so tags are dropped rather than mangled. Keep the FLAC as the tagged copy, or re-tag afterwards with a tool like Mp3tag or MusicBrainz Picard. AC-3 is inefficient by modern standards and is not accepted by browsers, phones or most web players without a downmix to stereo.
Will going from FLAC to AC3 reduce my audio quality?
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If FLAC is lossy and AC3 is lossless (e.g. MP3 → WAV), the AC3 is no better than the FLAC — you cannot recover information already discarded. If FLAC is lossless and AC3 is lossy, the AC3 codec recompresses; at 192 kbps the result is transparent for most content.
Can I batch convert hundreds of FLAC files to AC3?
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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.
Will the AC3 keep the same sample rate as FLAC?
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By default yes — 48 kHz FLAC stays 48 kHz in AC3. If you need to downsample for compatibility (96 kHz → 44.1 kHz for CD burning), the sample-rate option applies high-quality resampling in the same encode pass.
Can I normalize loudness when converting FLAC to AC3?
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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 AC3 through a Normalize tool on this site.
Will my AC3 play on car stereo, iPod, and Sonos?
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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. AC-3 is the surround track every AV receiver, DVD player and TV decodes natively, which is why it is still the broadcast baseline.
Is my FLAC file private during conversion to AC3?
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Yes. Uploaded FLAC files are processed on our own conversion servers, no person reviews them, and they are never shared. The upload and the converted AC3 are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.
How long does converting a 1-hour FLAC to AC3 take?
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It depends on the size and length of the file. Small documents and images are usually ready quickly. Long videos take the longest, because most video conversions re-encode every frame.
