Video Has No Sound? How to Diagnose and Fix It
A video that plays visually but produces no sound at all is worth diagnosing carefully, since "no sound" actually covers a few different underlying causes — some fixable in seconds, others requiring a re-encode.
Rule out the obvious first
Before assuming anything is wrong with the file itself, confirm the player's volume isn't muted, the correct audio output device is selected, and — if this is happening in a browser — that the tab or site isn't muted separately from the system volume. This sounds almost too obvious to mention, but it's genuinely the most common cause and costs nothing to rule out first.
The video genuinely has no audio track
Some videos — screen recordings without a microphone enabled, certain exports, footage from a camera with audio recording turned off — simply never had sound recorded or included in the first place. In this case, there's no audio to recover; the fix (if you have access to a separate audio recording made at the same time) is combining that audio with the video afterward, not troubleshooting playback.
An audio codec your player doesn't support
Similar to video codec issues, a file's container can hold an audio track encoded with a codec your specific player doesn't support, while the video codec plays fine — a mismatch that produces exactly this "picture but no sound" symptom. Trying a different media player or browser is a fast way to check whether this is the underlying issue.
The fix: re-encode with a standard audio codec
If the video does have audio but a specific player can't decode it, converting the file re-encodes both video and audio into more universally compatible codecs, which resolves the vast majority of "no sound" issues that are actually caused by codec incompatibility rather than a genuinely missing audio track.
Convert Video re-encodes both video and audio tracks into widely compatible formats directly in your browser. If you need to check whether an audio track exists at all, Extract Audio From Video will pull out whatever audio is actually present (or confirm there's none to extract). If you have separate audio to add to silent footage, Merge Videos can help combine sources.