M4A - WAV Conversion at Reverse Conversion

Convert M4A to WAV, WAV to M4A, multiple files in batch

Features

Bidirectional conversion of M4A at WAV

Auto-detect at convert added files to the opposite format

Batch conversion of up to 20 files

Support saving one by one at bundled saving with ZIP

Specify WAV output format

Choose sampling rate at mono/stereo

Choose M4A audio quality in 4 steps

Choose from 96-256kbps based on balance of capacity at audio quality

How to Use

1

Select conversion direction dropdown

Choose from auto, M4A → WAV, WAV → M4A, initial value is auto

2

Add audio file to convert

Add M4A, WAV by click or drag at drop, up to 20 files per time, up to 200MB per file

3

Adjust save format with advanced settings

Change WAV sampling rate, channel, M4A bitrate as needed

4

Execute conversion at preview/save

Convert in order with conversion button, confirm playback with player on each row, then save one by one or with ZIP

M4A - WAV Conversion at Reverse Conversion

Use Cases

Preparation for transcribing meeting recordings

Convert M4A recorded on smartphone to WAV that transcription software can read at import

Unify materials for editing software

Convert M4A materials to uncompressed WAV at unify to format easier to handle with audio editing software

Share lightweight audio after editing

Convert exported WAV to smaller capacity M4A at make it easier to send via chat or email

Prepare audio at specified rate

Prepare WAV at sampling rate or mono specified by submission destination

Basic Knowledge

Difference between M4A at WAV

M4A at WAV differ in whether audio is compressed at stored or stored as is without compression.

  • M4A:M4A is in most cases a format where audio compressed with AAC method by removing components difficult for ear to hear is stored in MP4 container, at 128kbps fits in approximately 1MB per minute.
  • WAV:WAV is format that records audio without compression in PCM as is, at 44,100 Hz, 16bit, stereo becomes approximately 10MB per minute.

Reason why audio quality does not recover even if converted to WAV

When creating M4A, some audio components are discarded during compression, at even if converted to WAV, discarded components are not restored. Converting to WAV increases capacity about 10 times, but audio quality is same as original M4A, at effect of conversion is becoming easier to handle with editing software or transcription software.

How to choose sampling rate

Sampling rate is the number of times per second audio is recorded, at highest audio that can be recorded is up to half that frequency.

  • 8,000 Hz:8,000 Hz is same level as telephone voice, at only sound up to 4,000 Hz remains, so use is limited to hearing voice.
  • 44,100 Hz:44,100 Hz is same value as music CD, at can record sound up to approximately 20,000 Hz considered upper limit of human hearing.
  • 48,000 Hz:48,000 Hz is value used as standard in video at broadcasting, at materials to load into video editing software become easier to handle when this value is unified.

Safety at Privacy

Tapos sa browser

Ang inilagay na data ay pinoproseso lamang sa loob ng iyong browser at hindi ipinapadala sa labas.

Proseso lamang sa loob ng browser

Audio file conversion ay ginagawa nang lubusan sa loob ng iyong browser, at ang mga input data ay hindi ipinapadala sa server.

Ang komunikasyon ay naka-encrypt gamit ang HTTPS

Ang pagkarga ng pahina ay naka-encrypt din ng TLS, at ang nilalaman ay hindi mababasa ng third party.

Walang pagpapadala sa third party

Ang mga input content ay hindi ipinapadala sa mga external na serbisyo tulad ng advertising network o tracker.

Walang awtomatikong pagpapanatili ng resulta

Converted audio at input suggestion ay hindi iniimbak sa server.

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