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Merge Videos: Online Video Merger and Video Combiner

Combine videos into one MP4 in the order you choose, with matched frame size and loudness.

10M+ files processed since 2021

In the editor

Opens in the editor with your clips arranged in order on the timeline.

Add the files first.

See the parts become one

Play each part, then the joined file.

Made with Merge videos, loudness matched with a 0.3 s crossfade

How to merge videos into one

  1. 1

    Add two to twenty MP4, MOV, or WebM clips and drag them into playback order.

  2. 2

    Press Merge videos to open the editor on Media, where you can reorder clips or turn on Even out loudness.

  3. 3

    Preview the combined timeline and press Export to download one finished MP4.

Combining multiple MP4 and MOV clips into one timeline

Audo’s online video merger and video combiner joins two to twenty MP4, MOV, MKV, WebM, or AVI files up to 2 GB into one continuous MP4 without an account, with the first 5 minutes free, 10 times a day, and no sign-up. Whether you are stitching an intro and outro onto an episode, combining multi-part phone clips, or assembling a highlight reel, all clips line up in order on a single browser timeline.

Because different cameras record at different resolutions, frame rates, and microphone levels, Audo conforms every clip to a shared canvas and lets you even out loudness across clips, add auto captions, or resize the frame before exporting one H.264 MP4.

Questions

How do I combine several videos into one MP4?

Add two to twenty video files at the top of the page, arrange them in the sequence they should play, and press Merge videos. Your clips open in order on the editor timeline so you can play through the joins and press Export to download one combined MP4.

What happens when I merge videos that have different sizes or frame rates?

The first clip in your sequence sets the output resolution and frame rate (or you can pick a target aspect ratio under Frame). Subsequent clips are scaled to fit or fill that frame cleanly so mixed phone and laptop recordings play as one uniform video.

Is there a transition between merged clips?

Each clip begins cleanly on the frame after the previous clip ends, so the merged video’s length equals the sum of your clips. To repeat a single clip with a crossfade at the seam, use Loop video.

Can I stop one clip from sounding much louder than the next?

Yes. Turn on Even out loudness (under More in the editor’s Media panel) to measure each clip and match its overall volume toward the longest recording—helpful when stitching an intro recorded on a laptop mic onto a phone video.

Will video still be exported if one clip has no sound?

Yes. Any silent clip receives silent audio for its portion of the timeline so the remaining clips keep their soundtracks in sync. Every input must contain a video track for the export to remain a video.

Can I reorder or trim clips before exporting the merged video?

Yes. Drag clips into a new order in the Media panel, or switch to Cut to trim false starts and pauses off individual clips before you export the combined MP4. Your project stays saved in this browser so you can come back and adjust it anytime.

Is it free?

Yes. Audo processes the first hour free, 10 times a day, without an account. The whole file costs $0.01 a minute ($0.60 an hour), charged only on success. No subscription. See pricing.

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Ask ChatGPT, Claude, or a coding agent to do this for you, or call it from your own code. When an agent's free result is cut short, it gives you a link to finish the whole file, no sign-up.

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curl -F file=@intro.mp4 -F file=@episode.mp4 https://audo.ai/api/try/join -D response.headers -o response.body