Convert FLAC audio to M4A with AAC encoding to create a copy for listening, review, or delivery. This free tool processes one file at a time, with no account or software installation required.
The result contains AAC audio, not ALAC. FLAC is losslessly compressed, while this conversion uses lossy AAC encoding. Keep your FLAC original for archiving or future editing, even if the M4A is the more convenient copy for today's task.
FLAC and M4A: identify the codec, not just the extension
M4A is an audio container that can hold different codecs. Seeing .m4a on a filename does not automatically mean lossless Apple audio. This tool specifically creates an M4A container with AAC audio.
| Property | FLAC input | This tool's M4A output |
|---|---|---|
| Extension | .flac | .m4a |
| Audio encoding | FLAC | AAC |
| Compression | Lossless | Lossy |
| Source precision | May be 16-bit or 24-bit | Original PCM precision is not guaranteed |
| Bitrate | Depends on the losslessly compressed content | Preset 192kbps; measured average can differ |
| Typical role | Lossless source or archive | Listening, review, or delivery copy |
AAC and ALAC are different codecs: AAC uses lossy compression, while ALAC is lossless. The distinction is documented in the MDN audio codec guide. This page does not provide an ALAC output option.
When converting FLAC to M4A makes sense
Make a listening copy for an AAC-compatible player
You may want a separate version for a phone or music player that accepts AAC in M4A. Convert one file and check it on the actual device before preparing more copies. Support depends on the player and file properties; changing the extension is not a guarantee that every device will accept it.
Share a review version of a recording
A lesson, rehearsal, or mix review may need a convenient audio copy rather than the full lossless source. An M4A can serve that purpose while the FLAC remains your reference. Listen to quiet passages, speech detail, and fades before sharing, and check the result against any attachment limit.
Meet a recipient's M4A requirement
If a client or application requests M4A, confirm that AAC is acceptable. A request for lossless ALAC cannot be met by this page's AAC output. Likewise, a particular bitrate, channel layout, or sample rate needs verification after download because this page does not expose those settings.
How to convert FLAC to M4A online
- Upload one FLAC file. Select or drag in a
.flacfile up to 200MB and 30 minutes. Wait for the file checks and upload to complete. - Start the conversion. The page already targets M4A. Start the task and let the service encode the audio with its preset AAC settings.
- Preview and download. When conversion finishes, preview the result if supported, download the
.m4afile, and test it in your intended player or receiving application.
Use a complete file available on your device, rather than a cloud-sharing URL. The page accepts .flac files. Changing the extension of an .ogg or another file to .flac does not change its contents or guarantee that it meets this page's upload and decoding requirements. Conversion creates a new file and does not overwrite the FLAC on your device.
What the downloaded M4A contains
The output should show AAC as the audio codec inside an M4A container. The converter uses a preset 192kbps bitrate setting. The measured average can vary with the material, clip length, and encoding behavior, so neither an exact bitrate reading nor a fixed output size is promised.
There are no bitrate, sample-rate, bit-depth, channel, or target-size selectors. Compare the downloaded duration, channels, and sample rate with the destination's requirements. If those requirements demand a different encoding profile or lossless preservation, this fixed conversion may not be suitable.
Check titles, track numbers, and artwork separately if you use a music library. FLAC and M4A store metadata differently, and complete transfer of tags or images is not guaranteed. A playable file may still need library information checked before you keep it as your everyday copy.
Can you convert FLAC to M4A without losing quality?
No. Whether the FLAC source is 16-bit or 24-bit, the AAC output is lossy. For a lossless M4A copy, use ALAC encoding; this page does not offer that option.
A sample-rate value that stays the same does not make the encoding lossless. Similarly, a player showing a decoding sample format does not establish that the AAC file preserves the original 24-bit precision. Decide whether the listening copy is suitable by checking both the required format and the actual sound.
Compare at a similar volume on the same playback setup. For later editing or another delivery format, return to the FLAC original where possible. Converting the AAC copy back to FLAC cannot recover information discarded during this step, and repeated lossy conversions can add further changes.
Estimate size without assuming every M4A is smaller
FLAC is already losslessly compressed, and its size depends on factors such as audio content, sample precision, and channel count. Silence or repetitive audio may compress very efficiently in FLAC, so an M4A made with this tool's AAC settings is not always smaller. For short clips, headers, tags, and other overhead can make up a larger share of the total file size and affect the comparison.
For an AAC estimate, MB ≈ average kbps × seconds ÷ 8000. An eight-minute file averaging 192kbps would contain about 11.52MB of audio data. This uses decimal megabytes, ignores file headers, and is a calculation example rather than a measured result or a selectable size target.
Duration alone cannot tell you the matching FLAC size, so the example does not establish a compression percentage. Download and compare actual sizes. If you need a file below a strict limit, check the saved result before sending it; this page has no size-target control.
The original also has to satisfy both input limits before conversion. A FLAC larger than 200MB is not accepted because a future copy might be smaller, and a compact recording longer than 30 minutes still exceeds the duration limit.
Input checks and playback
The page normally checks the FLAC input's duration in the browser before upload. If this fails, confirm that the file finished downloading and opens correctly in a FLAC-compatible player, then try another browser. Changing the filename extension does not repair damaged audio.
If the task completes but the M4A preview does not play, save the result and test an AAC-compatible application. Output playback support is separate from the earlier input-duration check. Inspect the saved file's start, end, and total duration before relying on it.
Frequently Asked Questions
Is the FLAC to M4A converter free?
Yes. No account or credits are required. You can submit one .flac file per task, with a maximum size of 200MB and duration of 30 minutes.
Does this converter produce AAC or ALAC?
It produces AAC audio in an .m4a container. It does not create ALAC, even though ALAC can also use the M4A extension. Confirm that the destination accepts AAC.
Can I convert FLAC to M4A without losing quality here?
No. This page produces lossy AAC, not lossless ALAC. The M4A extension alone does not guarantee lossless audio. Keep the FLAC source if you need exact preservation or a master for later editing.
Will a 24-bit FLAC stay lossless in M4A?
No. A 24-bit FLAC is still converted to lossy AAC here. Matching sample rates or a player's output-format display cannot make this conversion lossless.
Can I choose the AAC bitrate or file size?
No. The converter uses preset 192kbps encoding settings and offers no bitrate or target-size selector. Actual average bitrate and final size can differ, so check the download.
Why is my converted M4A larger than the FLAC?
FLAC may compress silence or repetitive audio very efficiently, so converting it to AAC with this tool's settings does not always produce a smaller M4A. For short clips, headers, tags, and other overhead also affect the size comparison. Check the actual downloaded size.
What if the FLAC or M4A preview fails?
If the page reports that it cannot read the FLAC's duration, check that the original file is complete and try another browser. If a completed M4A will not preview, download it and try an AAC-compatible player. Input checks and output playback are separate steps.