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How to Reduce Microsoft To Do Completion Sound Volume

Nimra MalikNimra Malik Sep 28, 2026 869 views

Question details

The user wants to reduce the task completion sound in Microsoft To Do, which became unusually loud after integrating with Outlook.

How to Reduce the Microsoft To Do Completion Sound Volume
Product
Microsoft To Do
Device & OS
Windows 10
Scenario
Checking off and completing tasks in the Microsoft To Do or Outlook desktop client.
Observed behavior
The completion sound plays at a significantly louder volume than expected, affecting both the standalone To Do app and the Outlook integration, with no obvious in-app volume slider available.
Before you start

Before troubleshooting, ensure your Windows 10 master system volume is set to a comfortable level and check if the loud sound also occurs in the web version of Microsoft To Do.

Solution 1Recommended

Use the Windows Volume Mixer to Lower App Sound

Since Microsoft To Do lacks a built-in volume slider, you can use the Windows Volume Mixer to reduce the sound level specifically for the To Do and Outlook apps without affecting the rest of your system.

Windows allows you to control the volume of individual desktop applications. By lowering the specific volume for Microsoft To Do or Outlook, you can resolve the loud chime without muting your entire computer.

1
Open Microsoft To Do

Launch the Microsoft To Do desktop app on your Windows 10 computer and complete a test task so the app registers an audio event with Windows.

2
Access the Volume Mixer

Right-click the speaker icon located in the Windows taskbar (bottom-right corner of your screen) and select 'Open Volume Mixer' from the context menu.

3
Adjust the App Slider

Scroll horizontally if necessary to locate the vertical volume slider for Microsoft To Do (or Microsoft Outlook). Click and drag the slider down to your preferred volume level.

Use the Windows Volume Mixer to Lower App Sound
Application Must Be Running: The application must be open and actively running for it to appear in the Windows Volume Mixer.
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Frequently Asked Questions

Why did the Microsoft To Do sound become so loud suddenly?

This volume spike is often caused by a known integration glitch between the To Do desktop app and Microsoft Outlook on Windows 10, which can cause the app to ignore default system audio scaling.

Does the web version of Microsoft To Do have the same volume issue?

Typically, no. The web version plays sounds through your web browser's audio settings, so it does not usually experience the same unusually loud volume spike as the standalone desktop client.

Can I change the completion sound to a different audio file?

No, Microsoft To Do does not currently offer a built-in feature to customize or change the default completion chime to a different sound file.

How do I fix the loud completion sound on mobile devices?

On iOS or Android, the completion sound is tied to your device's media volume. Simply use your phone's physical volume buttons to lower the sound while the Microsoft To Do app is open and active on your screen.