Trimmy
Vertical split-crop video editor. Take any video, pick two crop regions, stack them top-and-bottom into a 9:16 frame, and export optimized for social media.
The output stacks the two crops vertically into a single 9:16 video — ideal for reaction content, split-screen tutorials, gameplay + facecam, and Reels / TikToks / Shorts.
Install
pip install trimmy
Or run it without installing, using uv:
uvx trimmy
Requires ffmpeg and
ffprobeavailable on yourPATH, plus Python 3.10+.
Usage
Launch the app:
trimmy
Or open a file directly:
trimmy path/to/video.mp4
Then:
- Open or drag-drop a video.
- Position the two crop boxes on the source frame (TOP and BOTTOM).
- Adjust the split ratio by dragging the red divider.
- Trim the timeline to the segment you want.
- Pick a platform and quality preset.
- Render — ffmpeg encodes a ready-to-upload vertical video.
Keyboard shortcuts
| Key | Action |
|---|---|
| K | Play / Pause |
| J | Seek backward 5s |
| L | Seek forward 5s |
| Q | Set trim start to playhead |
| E | Set trim end to playhead |
| M | Toggle mute |
| ? | Show keyboard shortcuts |
Platform presets
| Platform | Resolution | Max FPS | Max Size | Codec |
|---|---|---|---|---|
| 1080x1920 | 60 | 300 MB | H.264 High 4.0 | |
| TikTok | 1080x1920 | 60 | 4 GB | H.264 High 4.2 |
| Twitter/X | 1080x1920 | 60 | 512 MB | H.264 High 4.2 |
| 720x1280 | 30 | 16 MB | H.264 Main 3.1 | |
| Telegram | 1080x1920 | 60 | 2 GB | H.264 High 4.2 |
Each platform offers a Max mode (highest quality, slower encode) and an Optimized mode (smaller files, faster encode). WhatsApp auto-caps bitrate to fit the 16 MB limit.
Development
Trimmy is built with PySide6. To work on it from source:
git clone https://github.com/musantro/trimmy.git
cd trimmy
uv sync
uv run python -m trimmy
See CHANGELOG.md for release history.
Documentation
The documentation site lives in docs and is configured with MkDocs Material:
uv run --group docs mkdocs serve
License
1 maintainer
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