MergeDrop

A self-hosted, drag-and-drop video merger. Drop clips → reorder → click Merge & Build MP4 → download a single ready-to-share file.

Why this exists

Most "merge video" tools are bloated desktop apps, paid SaaS, or sketchy converter sites that re-upload your footage to who-knows-where. MergeDrop is the opposite:

100% self-hosted, runs in a single container on your Runtipi
No accounts, no telemetry, no third-party upload caps
Mixed formats / resolutions / framerates → normalized to a clean 1080p30 h.264 + AAC MP4

Features

Drag-and-drop upload, drag-to-reorder, drag-to-remove
Live ffmpeg progress (percentage + tail of stderr) per merge job
In-browser preview of the merged result, then one-click download
Built-in janitor — old outputs are auto-deleted after a configurable retention window

Supported inputs

mp4, mov, mkv, avi, webm, m4v, flv, wmv, mpg/mpeg (mixed codecs and dimensions are normalized via two-pass ffmpeg pipeline).

Output presets

1080p (default), 720p, 4K, vertical 9:16, square 1:1 — selectable per job from the UI.

Configuration

Setting	Default	Description
Max files per merge	`20`	Hard cap per job
Max per-file size	`2 GiB`	Per-upload limit (bytes)
Output retention	`24h`	Janitor sweeps merged MP4s older than this

Volumes (persistent)

${APP_DATA_DIR}/data/uploads — staged source clips
${APP_DATA_DIR}/data/outputs — merged MP4 results
${APP_DATA_DIR}/data/thumbs — generated upload thumbnails

Tech stack

Backend: FastAPI + ffmpeg subprocess (async, streamed progress)
Frontend: React 19 + Tailwind + @dnd-kit + react-dropzone
Single container, single port, no database

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