How to Add Music, a Watermark and Effects to a Video (Free, No Watermark of Ours)

By the DocEpic team · Updated 10 November 2026 · 3 min read

Free video apps usually stamp their own logo on your video or lock the useful features behind a subscription. For the most common edits — background music, your own watermark, joining clips, slow motion, a funny voice — you don't need an app at all. Everything here runs in your browser, adds nothing of ours to the video, and keeps your files on your device.

Add background music

Add Music to Video mixes a song or any audio file into a video.

1. Open Add Music to Video and add your video, then choose the music — MP3, M4A, WAV, or the sound of another video.
2. Set the music volume, and the video's own sound: leave it up to keep voices with music underneath, or set it to 0 % to replace the sound with the music.
3. Type a start time in the song, such as 0:45, to skip a long intro.
4. Tick Repeat the music if the video is longer, and Fade the music out at the end for a smooth finish.
5. Download the video. For MP4, MOV and MKV the picture is copied as it is, so it is quick and loses no quality.

Only use music you have the right to use. Instagram and YouTube may mute or block videos with copyrighted songs; their own music libraries are the safe choice for public posts.

Add your name or logo

Add Watermark to Video puts text or a logo on every frame — in one corner, or repeated across the picture so it can't simply be cropped away. Text can be in any language, including Hindi, and a PNG or SVG logo with a transparent background looks best. It is a simple way to make sure reposted clips still carry your name.

Join several clips

Merge Video joins videos end to end in the order you choose. Clips from the same phone or camera are joined in seconds without losing quality. Mixed clips — different sizes or formats — are scaled to one frame size, with black bars rather than stretching, and re-encoded, which takes longer.

Slow motion, fast forward and voice effects

Change Speed slows a video or audio down for a slow-motion effect, or speeds it up for a time-lapse or a quicker lecture. Keep voices natural keeps the pitch normal, so a sped-up speaker doesn't sound like a chipmunk — or untick it if that is exactly the effect you want.

Voice Changer gives a voice a different character: deeper, higher, chipmunk, monster, robot, alien, echo or telephone, or a custom pitch. Play an 8-second preview first, then process the whole file. In a video, only the sound changes; the picture is copied as it is.

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