Merge Videos
Combine multiple video clips into one. Drag to reorder.
Combine multiple video clips into a single MP4. Drop the clips, drag to reorder, click Merge. Each clip is normalized to a uniform format before stitching, so a mix of MP4 + MOV + WebM + different framerates / resolutions still produces a clean joined output.
How it works
3-step walkthrough
How it works
3-step walkthrough
- 1
Drop the clips
Up to 20 videos at once. Mixed formats are fine — MP4, MOV, MKV, WebM, AVI all accepted.
- 2
Reorder if needed
Drag any row up or down. Clips merge top-to-bottom in the order shown.
- 3
Merge and download
Each clip is re-encoded to H.264 / AAC at uniform settings, written to an intermediate MPEG-TS stream, then concatenated using FFmpeg's concat protocol. Output is MP4 with the faststart flag.
Why use Dropvert
Local-first, free, no upload required
Why use Dropvert
Local-first, free, no upload required
- Handles mixed-codec inputs cleanly — most browser-based mergers fail when source clips have different formats.
- Drag-to-reorder so you don't have to rename files alphabetically to control sequence.
- Browser-side. Works on private footage.
- No watermark, no signup, no per-day limit.
Frequently asked questions
5 answered
Frequently asked questions
5 answered
- Why does merging take longer than I expect?
- Each clip is re-encoded to a uniform format before being concatenated, which is slower than a "stream-copy" merge. The trade-off: re-encoded merges work reliably on mixed codecs and resolutions, while stream-copy merges fail or produce broken output when sources don't match exactly. We chose reliability over raw speed.
- Can I add transitions between clips?
- Not in v1. The current merge is a hard cut between clips — no fade, no crossfade. Transition support would require a more complex filtering pipeline; tracked for a future version.
- What if my clips have different resolutions?
- They're all re-encoded to H.264 with even-rounded dimensions. Mixed resolutions work but the output uses the resolution of the first clip; smaller clips are letterboxed or scaled. For the cleanest output, use clips at the same resolution.
- How many clips can I merge?
- Up to 20 at once. The practical limit is total duration vs. browser memory — 20 short clips is fine, 5 hour-long clips will struggle.
- Is the audio merged correctly?
- Yes. Each clip's audio is re-encoded to AAC at 128 kbps, then concatenated alongside the video. Audio levels are not normalized between clips — if one clip is louder than another, that's preserved in the output.
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