This is my first choice for three reasons: it works directly from their website, has no file size restriction, and supports batch conversions.

Other than those things, Audio-Convert.com is similar to the other web-based converters below—add one or more files from your computer, Dropbox, or URL, and convert them online to several formats.

• Input Formats: M4A, M4B, M4P, M4R, M4V, MP3, MP4, OGG, WAV, WAVE, and others
• Output Formats: AAC, AIFF, FLAC, M4A, M4R, MMF, MIDI, MP3, OGG, OPUS, WAV, and WMA

You can convert more than one file at a time, and each one can have its own conversion settings or the same settings. This applies to the format, encoder, quality, sampling rate, and channel.

Once the conversion process is complete, save the files to your computer individually or as a ZIP archive if there are multiple files.

Zamzar has always been a favorite of mine. I like that it’s way more than just an audio converter, but even in this context, I appreciate that it works through my browser and that I can easily import files from my favorite cloud storage services.

Like any online file converter, it’s super easy to use. To get started, upload the files you want to convert. Here’s what’s supported:

• Input Formats: 3GA, AAC, AC3, AIFC, AIFF, AMR, APE, CAF, FLAC, M4A, M4B, M4R, MIDI, MP3, OGA, OGG, RA, RAM, WAV, and WMA
• Output Formats: AAC, AC3, FLAC, M4A, M4R, MP3, MP4, OGG, WAV, and WMA

Zamzar’s conversion time can be slower compared to other online audio converter services. Fortunately, you don’t have to wait for an email to receive the download link. Unless you opt to receive an email, you can remain on the download page to download the converted file as soon as it’s ready.

It can be used with any modern web browser on any OS, such as Windows, macOS, and Linux. You can also convert files by email with Zamzar by attaching the file (1 MB max for free users) to a message and sending it to a special email address.

Despite its name, Movavi’s converter also works with audio and video files as well as images. The program is free from ads, and I found its interface intuitive.

My favorite feature is that it lets me pick a device instead of a format for the output option. Sometimes, I’m unsure which formats suit which devices, which removes the uncertainty of choosing a file format.

• Input Formats: AAC, AC3, AIF, AIFF, AIFC, APE, AU, F4A, FLAC, M4A, M4B, M4R, MKA, MP3, OGG, OPUS, WAV, and WMA
• Output Formats: AAC, AC3, AIFF, AU, F4A, FLAC, M4A, M4B, M4R, MKA, MP3, OGG, WAV, and WMA (see all the supported formats here)

Bulk importing is supported to convert all your audio files simultaneously. You can also rename the file before the conversion starts and quickly save it back to the same folder as the original file.

The website says it’s compatible with Windows 10, 8, and 7, as well as macOS. I tested it in Windows 11 and found it worked just as expected.

I like the Hamster audio converter because it installs in seconds and has a minimal, step-by-step style interface that makes it easy to use. Not only can it convert multiple audio files in bulk, but it can also merge the files into one.

• Input Formats: AAC, AC3, AIFF, AMR, FLAC, MP2, MP3, OGG, RM, VOC, WAV, and WMA
• Output Formats: AAC, AC3, AIFF, AMR, FLAC, MP3, MP2, OGG, RM, WAV, and WMA

After importing files to convert, this program lets you choose any of the output formats from above or pick from a device if you’re not sure what format the file needs to be in. For example, instead of choosing OGG or WAV, you can pick the actual device, like Apple, Microsoft, HTC, and others.

It is reported to work with Windows 7, Vista, XP, and 2000, and I successfully tested it on Windows 11 without any issues.

fre:ac is a desktop audio converter program that packs several features, making it a bit difficult to use. However, you’ll love it if you’re interested in advanced options.

• Input Formats: 3GP, 3GPP, AAC, AIF, AIFF, AIFC, AMR, AEA, AT3, AVI, CUE, DSF, DFF, DSS, DTS, EAC3, FLAC, FLV, F4V, HTK, IFF, MAC, MKA, MLP, M4A, M4B, M4R, MP1, MP2, MP3, MP4, OGA, OGG, PAF, PVF, RF64, SF, SND, SPX, SVX, AU, VOC, W64, WAV, WMA, WVE, and others
• Output Formats: (same as input formats)

As you can see from that list, fre:ac also supports video formats, meaning you can extract audio from your videos.

Some of the advanced features I found noteworthy while using this program include the following: import files by pattern, edit metadata, configure signal processing, rip CDs, edit every encoder’s settings, enable input and output verification, and auto-delete original files after encoding.

This tool is compatible with Windows, macOS, and Linux.