GrowingUpVideoGrowingUpVideo
movie_edit Free Tool

Free Video Merger

Join multiple MP4 videos into one file. Reorder clips, then merge instantly in your browser — no upload, no re-encoding, no quality loss.

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Drop MP4 files here or click to upload

Up to 10 files · Max 200 MB each · Max 500 MB total

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Made several morphing videos? Join them into one

GrowingUpVideo generates one video per set of photos, up to 8 images at a time. If you've created multiple growing-up videos — one covering childhood and another covering teenage years — this tool lets you join them into a single continuous clip. Download each video from GrowingUpVideo, upload them here in chronological order, and merge. The result is a single MP4 you can share anywhere, exactly as if it had been generated in one go.

Create your growing-up video arrow_forward

How to Use the Free Video Merger

  1. 1

    Upload your MP4 videos

    Click the upload area or drop MP4 files onto the page. You can add up to 10 videos at a time.

  2. 2

    Set the order

    Use the up and down arrows next to each clip to arrange them in the order you want them to play.

  3. 3

    Merge

    Click "Merge Videos". FFmpeg runs entirely in your browser — no uploading, no server, no waiting in a queue.

  4. 4

    Download

    Click Download to save the merged MP4. The file plays in any player and can be shared directly to social media.

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Frequently Asked Questions

No. Everything runs in WebAssembly inside your browser. Your video files never leave your device.
No. The tool uses stream copy — it joins the video data without re-encoding, so there is zero quality loss and the merge takes seconds.
MP4 files with H.264 video work best. All clips should use the same codec and resolution for a seamless merge.
The first time you click Merge, the tool downloads FFmpeg WebAssembly (~8MB) from a CDN. Your browser caches it, so subsequent merges are instant.
auto_awesome AI Morphing Video

Turn these photos into
a cinematic AI video

Claude AI analyzes and sorts your photos by age, then morphs them into a smooth, cinematic transformation video.

From $9.90  ·  ~5 minutes  ·  No editing skills needed