Video Merger - Combine Multiple Videos Online

Merge multiple videos into one file. Drag to reorder, preview thumbnails, concatenate with FFmpeg. No uploads, browser-based, completely private.

1. Add Videos

Drop videos here or click to browse

Select multiple files • MP4, WebM, MOV, AVI

2. Reorder Videos 0 videos

3. Merge Videos

Total Duration

0:00

Total Size

0 MB

Merged Video Waiting...

Merged video will appear here

Add videos and click "Merge Videos"

Tips for Best Results

Match settings: Videos with identical resolution, codec, and frame rate merge faster without quality loss.
Check orientation: Mixing portrait and landscape videos will add black bars to fit the first video's aspect ratio.
Audio matters: All videos should have audio, or none should. Mixing causes sync issues.
Reorder freely: Drag videos up/down to arrange them before merging.
Browser limits: Keep total size under 2GB for smooth processing.

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Frequently Asked Questions

Video merging (or concatenation) combines multiple video files into a single continuous video. This tool uses FFmpeg to join videos end-to-end, with the second video playing immediately after the first, and so on.

For best results, yes. Videos with identical resolution, codec, and frame rate will merge fastest without quality loss. If videos differ, FFmpeg will re-encode them to match the first video's settings, which takes longer but ensures compatibility.

Yes! Drag and drop videos in the list to reorder them. The merged video will play clips in the order shown from top to bottom. Reorder as many times as needed before clicking merge.

There's no hard limit, but browser memory constraints apply. Merging 2-10 videos works smoothly. Very large files or many videos (20+) may be slower or fail depending on your device's available memory.

Yes. FFmpeg preserves audio-video sync for each clip. As long as individual videos have proper sync before merging, the merged video will maintain synchronization throughout all segments.

If all videos have matching settings (same codec, resolution, frame rate), quality is preserved perfectly. If settings differ, FFmpeg re-encodes to match the first video, which may introduce slight quality loss from compression.

Yes. The tool accepts mixed formats. FFmpeg handles format conversion automatically during the merge process. The output is always MP4 for maximum compatibility across devices and platforms.

Speed depends on video count, total file size, and whether re-encoding is needed. Matching videos merge quickly (stream copy). Different resolutions/codecs require re-encoding, which takes longer - expect 1-2 minutes per hour of video content.

Browser processing has practical limits around 2-3GB total. Most devices handle up to 30-60 minutes of merged video smoothly. For very large projects, consider desktop FFmpeg or professional video editing software.

No. All processing happens locally in your browser using FFmpeg WebAssembly. Your videos never leave your device. Everything runs client-side with complete privacy - no server uploads or cloud processing.

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