Lossless audio container export

Free M4A to FLAC Converter Online for Archiving

Move audio from an M4A container into FLAC for libraries, metadata-friendly archives, and tools that work more reliably with open lossless formats.

Files stay on your device Batch up to 10 files Format-specific settings

Choose M4A files

or drag and drop them here

Up to 10 files, 250 MB each. Processing stays on this device.Public links must allow CORS access from this browser.

Advanced settings (optional)Applied to the batch

M4A to FLAC audio and timing settings

Set audio quality, level, fades, and an optional time range.

Sample rate and channels

Reverse audio

Volume

100%

Audio fades

Fade in (1 second)Fade out (1 second)

Trim time

Leave blank to convert the complete file. End time must be later than start time.

Apply from preset

Save current settings

Settings and files remain in this tab.

Add files to beginOutput: .flac · FLAC

Three-step local workflow

How to convert M4A to FLAC online without uploading

Choose M4A files for the free online converter
Select files from your device or drag them into the upload area. The queue accepts up to ten files and keeps each item inside the current tab.
Set optional M4A to FLAC output controls
Choose bitrate where available, adjust volume, add fades, and enter optional trim times for the section you need.
Convert locally and download the finished FLAC file
Select Convert to FLAC, keep the tab open, and use the download button when each queued item reaches 100 percent.

Built for a focused conversion job

Why use this free M4A to FLAC converter online?

Easy M4A file conversion

A clear queue, sensible defaults, progress, previews, and individual downloads keep every batch easy to scan.

Useful FLAC quality controls

Choose FLAC when the next stage should avoid further lossy encoding. Expect a larger result than the original M4A in many cases.

Private browser-based M4A processing

Source media is handled by WebAssembly in your browser. There is no account, cloud conversion queue, or application-server file upload.

.m4a

What is a M4A MPEG-4 Audio file?

M4A is an audio-focused MPEG-4 container commonly used for AAC or Apple Lossless recordings, music, podcasts, and voice memos.

Although M4A works in modern audio software, video-only destinations require a visual stream or a different output container.

.flac

What is a FLAC Free Lossless Audio Codec file?

FLAC compresses PCM audio without changing the decoded signal and is popular for music libraries and archives.

FLAC avoids another lossy storage stage, but it cannot repair quality already removed from a source M4A file.

Best M4A to FLAC settings for practical quality

FLAC compresses PCM audio without additional data loss, but converting a lossy AAC-based M4A to FLAC cannot recreate information missing from the source. Choose FLAC when the next stage should avoid further lossy encoding. Expect a larger result than the original M4A in many cases. Match the settings to the destination instead of simply maximizing every value.

Specific MP4 converters

Convert other files to MP4 format

Open any supported video or audio file converter.

M4AtoMP4.com can convert your other supported files to MP4 format:

M4A output converters

Convert Your M4A files to other formats

Choose a video or audio destination for M4A files.

M4AtoMP4.com can convert your M4A files to these other supported formats:

M4A to OGV M4A to AVI M4A to 3GP M4A to WEBM M4A to MKV M4A to WMV M4A to FLV M4A to MOV M4A to OGG M4A to WMA M4A to WAV M4A to ALAC M4A to MP3 M4A to AAC M4A to AIFF M4A to OPUS

Your media, your device

Private M4A to FLAC conversion in your browser

The WebAssembly conversion engine runs locally. Selected files are not posted to an application server, stored in an account, or retained after the tab is closed. Standard page requests may still create limited hosting logs described in the privacy policy.

No media upload
No account required
No conversion history
Local download links

Read the privacy policy

Clear answers before you convert

M4A to FLAC converter questions and answers

Technical answers about local M4A file processing, FLAC output settings, quality, batches, and browser requirements.

How can I convert M4A to FLAC online for free?

Choose one or more M4A files from your device, or import a public CORS-enabled file URL. Review the optional output settings and select Convert to FLAC. The browser loads a local WebAssembly conversion engine, processes each item in order, and creates a download link when the file is ready.

Does the M4A to FLAC converter upload my files?

No. Media selected in this tool is processed inside the current browser tab. The site does not send source files or finished downloads to an application server. Closing or refreshing the tab clears the working queue.

Can I batch convert multiple M4A files to FLAC?

Yes. Add up to ten files per batch, with a browser limit of 250 MB per file. The converter processes the queue one item at a time to reduce memory pressure. Download each completed item separately or package multiple completed files into one local ZIP archive.

Which advanced M4A to FLAC settings are available?

You can choose an output bitrate when the destination codec uses one, set sample rate and mono or stereo output, reverse audio, adjust volume, add one-second fades, and trim a precise section before export.

Will converting M4A to FLAC change audio quality?

Any decode-and-encode workflow can change the signal, especially when the output uses a lossy codec. Choose a bitrate appropriate for the source and destination. Increasing the output bitrate cannot restore detail that is absent from the original file.

Why can browser-based M4A to FLAC conversion take time?

The conversion runs on your device rather than a remote media server. File duration, video resolution, visual style, codec, available memory, and processor speed all affect completion time. Keep the tab open until the current file finishes.