As an amateur video/photographer, I would take videos of ballroom dancer’ s showcase routines or competitions with the accompanying audio track and publish the video on YouTube, only to have YouTube block the audio due to copyrights. I would spend hours getting the video and audio “just right” for YouTube. If I had known about the copyrights, I would not have spent so much time on the productions. Sometimes you might want to share such videos without infringing on the copyrights or you find the audio distracting.
Fortunately, there is a quick way to silence the audio using the Photos app on your iPhone or iPad.
This is for the iPhone and iPad

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Edit the Video
First, open the Photos app on your iPhone or iPad. Now, locate the video you would like to silence and tap on its thumbnail to open. Refer to below image:

Next, tap the Edit icon in the upper-right corner of your screen. See below image:

Disable the Audio
If the audio is enabled, a yellow speaker icon will appear in the upper-left corner of your screen. To disable the audio, tap the icon. See following image;

Unlike other speaker icons on the iPhone or iPad, this is not simply a mute button. Tapping the yellow speaker icon removes the audio track from the video file so that the audio will be silent when you share it.
With the audio disabled, the icon will change to a grayed-out speaker icon with a diagonal strike mark through it. Refer to below image;

To save your change, tap Done in lower right-hand of your screen. See below image:

In Photos, you will see a grayed-out speaker icon on the toolbar if a video has no audio track. See following image:

If the icon looks like a crossed-out speaker, it could mean that you phone is merely silenced. If so, simply turn the sound back on and make sure the speaker icon is fully grayed out before sharing. Now you can share the video without the audio component.
Restore the Audio
The Photos app saves the original videos you edited, so you can undo your changes.
After sharing, launch the Photos app and inspect the video you would like to restore the sound. Tap Edit in the upper right-hand corner of the screen, then tap Revert at the bottom right. The audio for that video will be restored. Refer to below image:

You will receive a confirmation message. Simply click the Revert to Original button. See below image;

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