How to Convert a Folder of Audacity Files to MP3

By Nick Peers

Manually converting dozens of audio files to MP3 format can be time-consuming, **unless you use Audacity's batch convert chain**. The chain performs all the procedures necessary to convert any audio file supported by Audacity 2.0 to an MP3 file. The process is completely automated, and Audacity can convert hundreds of files in a folder to MP3 files -- a process that would take you many hours to complete -- in a matter of minutes. Note that the **The LAME codec is required for the conversion**.

Step 1

Download the LAME software codec before attempting to convert the audio files to MP3 format. **Audacity needs LAME to encode MP3 audio data**.To download LAME, open the [MP3 for Audacity]( page, scroll to the **To Download LAME and FFmpeg for Windows** section and click the **Lame_v3.99.3_for_Windows.exe** link.

Step 2

Double-click the file to start the setup wizard and click **Next**. You are advised to close all applications -- **especially Audacity, if it is running** -- before starting the setup, but this is not mandatory.

Step 3

Click **Next** if you agree to the terms of the LAME Licensing Agreement to proceed to the next step.

Step 4

Click **Browse** if you want to change the destination folder. LAME needs about 2MB of free disk space, so there is no need to change the default folder in most cases. Click **Next**.

Step 5

Review the setup settings and click **Back** if you need to change them. To cancel the setup, click **Cancel**. Install LAME by clicking the **Install** button. The wizard installs the program in just a few seconds; click **Finish** after the process is complete.

Step 6

Launch [Audacity](, click **File** and select **Apply Chain** from the menu. Audacity comes with a single pre-installed chain: the **MP3 Conversion** chain.

Step 7

Select the **MP3 Conversion** chain from the list of available chains and click the **Apply to Files** button to apply the chain to an entire folder. If, on the other hand, you wish to convert only the audio tracks in the project, click **Apply to Current Project**.

Step 8

Select the folder that contains the audio files and then select the files you want to convert to MP3. Select everything in the folder by pressing **Ctrl-A**. Select specific items by holding **Ctrl** and clicking each file. Click **Open**.

Step 9

Select the **Make a copy of the files before...** or **Read the files directly** option. The first option is safer -- **but slower** -- because it copies each file into the project and then edits it. The latter option is faster because Audacity reads the files directly from their location without copying them into the project.Check the **Don't warn again...** box to prevent Audacity from prompting you to make a choice for every file in the batch. Click **OK**.

Step 10

Open the folder that contains the original audio files and then open the **Cleaned** sub-folder that was created by Audacity to store the MP3 files. Verify the MP3s to ensure the conversion was successful. **Do not delete the original files before you verify the results**.

Tips & Warnings

  • If Audacity does not find the "lame_enc.dll" file when you attempt to apply the chain, click "Browse" to locate the file manually. Open the folder that contains LAME -- C:\Program Files\Lame For Audacity, in most cases -- and select the DLL file. Click "Open" and then "OK" to point Audacity to the DLL.
  • Audacity can work with WAV, AIFF, OGG, FLAC, MP2 and MP3 files natively. If you install the FFmpeg library on your computer, Audacity can also work with AC3, MP4, WMA, M4A and AMR formats.
  • Don't delete the original audio files before you verify the converted MP3 files. If Audacity doesn't convert the files correctly, you may be unable to recover the originals.