Creating your own ring tone for your iPhone 5 gives you more options to personalize your device. The iPhone 5 supports only ring tones in the M4R format, so you must convert any audio file that isn't already in that format. After converting your audio to an M4R file, you can import it to iTunes and sync it to your device. Voice memos on the iPhone use the AAC format and the M4A file extension. Since M4R files use the same format as M4A files, you can change the file extension name to make your iPhone recognize it as a ring tone.
Editing and Syncing Voice Memos
Select the "Voice Memos" app and choose the voice memo you want to trim on your iPhone.
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Choose the "Edit" button.
Tap the trim symbol and drag the left and right border to change the length of the file. The total length of a ring tone can't exceed 40 seconds.
Select "Trim" to save the voice memo.
Connect your iPhone to your computer using the provided USB connector cable. Select your "iPhone" from the menu bar or the side bar in iTunes.
Select the "Music" tab and choose the option to "Include Voice Memos."
Converting Ring Tones on Windows
Press the "Windows-X" keys simultaneously and select "Control Panel" from the list of options.
Click "Folder Options." If Folder Options doesn't display in the list of options, type "Folder Options" in the Search field.
Click the "View" tab, enable the option to "Hide Extensions for Known File Types" and click "Apply."
Drag the voice memo from your iTunes Music library to the Desktop.
Right-click the file and select "Rename."
Rename the M4A extension to "M4R" and press "Enter." Click "Yes" to confirm the change and drag the newly created file to your iTunes music library. ITunes now recognizes the file as a ring tone and adds it to the Tones library.
Converting on Mac
Drag the voice memo from your iTunes library that you want to convert into a ring tone to your Desktop on Mac OS X Mavericks.
Right-click on the file you saved to your Desktop and select "Get Info."
Click the "Name & Extension" field and change the extension to "M4R" to make iTunes recognize the file as a ring tone. Select the "Use .M4R" format to confirm.
Drag the file back to the iTunes "Tones" folder.
Syncing Ring Tones
Connect your iPhone to your computer using the provided USB connector cable.
Select your iPhone and click the "Tones" tab.
Check the "Sync Tones" box and either select the option to sync "All Tones" or "Selected Tones." Check the box next to the newly created ring tone if you chose the option to sync only selected tones.
Click "Apply" to sync the ring tone to your iPhone.
Information in this article applies to Mac OS X Mavericks, Windows 8.1 and iOS 7. It may vary slightly or significantly with other versions or products.