Lunio

How to remove the sound from a video on iPhone

Short answer: in Photos, tap Edit on the video and tap the speaker icon to mute it. To get a separate silent copy, or to put different audio under the video, use Lunio → Remove or Replace Sound.

Built in: Photos

1. Open the video in Photos and tap Edit.
2. Tap the speaker icon so it shows as muted.
3. Tap Done. (You can undo this later with Revert.)

With Lunio: a silent copy, or new sound

1. In Lunio, tap Choose Video and pick the video.
2. Tap Remove or Replace Sound.
3. Remove Sound makes a silent copy; the picture is untouched.
4. Replace Sound puts a clip from your Lunio Library under the video. Short clips repeat to fill it; the end fades out.
5. Tap Save to Photos or Share.

Both are free.

FAQ

Does it lower the video quality? Removing sound keeps the original picture. Replacing sound re-encodes the video at high quality.

Can I keep the original audio as well? Yes — extract it first with Extract Audio; it stays in your Library.