Best Top 7 Free Online Audio Converter for MP3, WAV, FLAC, M4A etc.

Posted by Mia to audio processing, audio converter | June 6, 2018

There are more than 50 common audio formats, of which MP3, AAC, FLAC, WMA, WAV, AIFF, OPUS, M4A are among the most popular audio formats. Sometimes we need to convert between them for better compatibility, or higher efficiency. For example, we decode YouTube music video of MP4 to MP3, switch WAV to MP3 etc. for playback on a music player, iPhone, iPad, iPod, Android phones, putting them to iTunes or songs apps, to mention but a few. A free online audio converter is a good choice if you have small music files to convert occasionally. It requires no download, installation, update and even register. Follow our guide and select the right online audio conversion application to transcode sound files and extract audios from videos.

Audio Converter

Max file size: 256MB
Supported audio formats: AAC, MP3, OGG, AIFF, FLAC, WAV, WMA, M4A, OPUS, M4R, MMF.

Audio Converter is the first online free audio converter we recommend you to use for good reasons. It offers 256MB audio file size for free users, which is larger than other free online audio conversion applications offer. Think of an audio format, any commonly used format that you may need to convert to, the online application supports it. Audio Converter is safe and clean, there are no annoying ads here and there on the screen. Select an audio format on the top you want to convert to, choose an audio file from your computer, select quality, click the CONVERT button, and done. Audio files will be loaded and converted quickly.

Aconvert

Max file size: 200MB
Supported audio formats: MP3, AAC, WMA, WAV, FLAC, OGG, OPUS, M4A, AU, MKA, AIFF.

Aconvert is not merely for audio conversion but it does a good job in audio transcoding. You can convert most popular audio format and video audio URL, for example, shift WAV to MP3, M4A to WAV, MP4 video to MP3 audio online. But it fails to extract audio from online video URL, you need other tools to convert YouTube URL to MP3, AAC or any other audio format. The free online audio converter offers basic audio bitrate and sample rate options and its conversion speed is fast. Users are able to download the converted audio file to your computer, Google Drive, Dropbox or save it to the mobile phone by scanning QR code image. Pay attention to the ads on the interface and some misleading "Start Now", "Get Started" buttons or such likes.

Convertio

Max file size: 100MB
Supported audio formats: MP3, AAC, AC3, WAV, FLAC, OGG, WMA, M4A, AIFF, CAF, APE, DTS, AMR.

The maximum music size free users can convert is 100MB, which is not appealing at all, compared to the above free online audio conversion programs. However, you'll be pleased to find that Convertio can free convert audio from FLAC to MP3 format, WAV to AAC, AAC to MP3, etc. in batch at blazing fast speed. Moreover, users can download completed audio file one by one or download all in a zipping with much smaller size for easier and faster sharing, downloading and space saving. It pops up ads when you process audio transcoding, and only registered users can remove ads.

Files Conversion

Max file size: 100MB
Supported audio formats: MP3, AC3, WMA, ALAC, FLAC, AMR, AIFF, MP2, VOC.

If you are looking for a simple online audio converter, Files Conversion is a good choice. Just select an audio file, choose an output format and click the Convert button, finished. There's no access to adjust audio bitrate and sample rate before conversion. VOC used by RCA Digital Voice Recorder is supported by Files Conversion. One of the biggest disadvantages of the online program is its slower online audio conversion speed. During our test, we experienced an error converting an MP3 audio to WAV.

AudioConverto

Max file size: 100MB
Supported audio formats: MP3, AC3, WAV, WMA, FLAC, OGG, M4R.

AudioConverto has all the basic features you expect from free online audio extractors. It's easy, fast and safe. The converter supports some popular audio formats like MP3, AC3, WAC, FLAC, etc. It's a pity that commonly used soundtrack music formats AAC and AC3 are not supported by AudioConverto. Most users resort to it to convert MP3 audio to M4R free online and increase audio volume. One bonus feature you must know is its ability to compress audio file size by lowering down audio bitrate.

CoolUtils

Max file size: 100MB
Supported output formats: MP3, WMA, WAV, OGG.

CoolUtils is inferior to the rest of free online audio conversion apps on the list since it can only output MP3, WMA, WAV and OGG audio format, which is far from enough. When it comes to interface, conversion speed and performance, the tool is qualified. We converted a 940KB MP3 audio to WAV format and we didn't change audio sample rate, bit rate or audio channel, only 2 seconds were needed to finish the task, and there were no redirects. CoolUtils also enables users to rip audio file from videos.

Online Converter

Max file size: 200MB
Supported output audio formats: MP3, WMA, WAV, FLAC, ALAC, M4R, AMR, OGG, AIFF.

This is a free online audio converter designed for iPhone, iPad, and Android mobile devices. If you need to transcode audio from a format to another compatible with mobiles, Online Converter is your best bet. It gives access to send the file to your phone by scanning after the audio conversion process is completed. Users are allowed to download a file for up to 10 times and the file is preserved for 24 hours. However, the interface looks outdated and ads make it look even worse.

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For any questions with MacX Video Converter Pro, please feel free to contact our support team.