How to Make Audio Files Smaller to Post on a Tumblr

By Paul Higgins

Learn how to compress an audio file to bring its file size under the 10MB limit set by Tumblr for audio posts.

Make your audio files smaller than 10MB -- the maximum file size for MP3 files uploaded to Tumblr -- using iTunes on your Windows or Mac computer.


Reducing the size of MP3 files decreases the sound quality of the recording.


  • Tumblr supports audio files only in the MP3 format.
  • The 10MB file size limit applies only to audio files you upload to the Tumblr servers. To add an MP3 file larger than 10MB to your blog without decreasing its sound quality, upload the audio file to a different website -- such as a paid or free Web hosting service -- and enter the URL pointing to the file in Tumblr's audio post editor.
  • Alternatively, upload the audio file to SoudCloud and paste a link to the upload in the audio post editor on Tumblr.

Step 1

Open the iTunes menu and select Preferences.

Step 2

Click Import Settings.

Click the Import Settings button.

Step 3

Select MP3 Encoder and Good Quality.

Select MP3 Encoder from the Import Using drop-down menu and Good Quality (128kbps) from the Setting menu. Click OK to save your new import settings.

Step 4

Create a new MP3 version of the audio file.

Select the audio file to convert from your iTunes library.

Open the File menu, hover your mouse over Create New Version and select Create MP3 Version.

ITunes then automatically creates a duplicate file using the quality settings you specified earlier in the Import Settings window. Right-click the new file and select Show in Windows Explorer -- or Show in Finder on a Mac -- and check whether the file size is under 10MB.


  • If necessary, add the audio file to your iTunes library by selecting Add File to Library from the File menu.
  • If you do not see the File menu, open the iTunes menu and select Show Menu Bar.
  • If the file size is still over 10MB despite using the Good Quality audio quality settings, repeat the process and further lower the quality settings. You can do so by selecting Preferences from the iTunes menu, clicking Import Settings and selecting Custom from the Settings menu. Decrease the value next to Stereo Bit Rate until iTunes generates a file under 10MB.