Free voice over video maker: record a voiceover or add audio to any video online

Yes. There is no account, no credit card, no watermark, and no cap on the number of videos, clips, takes, or minutes. It is free because recording, mixing, and rendering all happen in your browser instead of on our servers, so it costs us nothing to run for you.

No. The videos you add and every voice take you record stay in this browser tab. The microphone audio is captured and mixed on your device, and the MP4 is rendered locally with WebCodecs. Nothing is sent to captionrich or anyone else.

Any microphone your device can use: the built-in mic, a USB mic, a wired headset, or an audio interface with an XLR mic. Pick it from the list in record mode. It works in current Chrome, Edge, Safari, and Firefox on Windows, macOS, Linux, iPhone, iPad, and Android. Bluetooth headsets such as AirPods switch to a low-quality call mode while their mic is on, so a wired or built-in mic sounds better.

Yes. Drop in as many videos as you like; they play back to back on one timeline in the order you choose. Select a clip and press Record voice over on this clip to narrate just that clip (recording stops at its end), or record one continuous take across all of them.

Yes. Click the music icon, drop a file onto the studio, or select a clip and choose Add audio to this clip. MP3, WAV, M4A, AAC, OGG, FLAC, and the soundtrack of another video all work. The audio lands at the playhead, and you can drag and trim it like any recorded take.

Record while the video plays and the take is placed exactly where you spoke, with the browser's audio delay compensated. After that, drag the take to slide it, use the nudge buttons or the arrow keys for small moves, and trim or split it. Edges snap to clip boundaries, other takes, and the playhead.

Yes. Each clip has its own Original sound slider and a mute button. Lower video sound under voice, on by default, automatically ducks the original audio whenever a voice take plays and brings it back up between takes, so background noise never fights your narration.

An MP4 (H.264 video, AAC audio) with every clip, your voice takes, and the original sound mixed as you set it, at the original quality or 1080p or 720p. When the clips are untrimmed H.264, the picture is copied untouched, so there is no quality loss. You can also download the audio mix, or only the voice, as a WAV file.

The studio warns you before the tab is closed, refreshed, or navigated away, because clips and recordings live only in that tab and are never stored on a server. Export your video (or download each take as WAV) to keep your work.

Yes, in captionrich. Export the MP4, then open it in the captionrich editor: it transcribes your voice over and animates every word in dozens of caption styles, with filler-word and silence removal in one click. The editor has a free plan, and the free caption generator works without an account.