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 ffprobe available on your PATH, plus Python 3.10+.

Usage

Launch the app:

trimmy

Or open a file directly:

trimmy path/to/video.mp4

Then:

1. Open or drag-drop a video.
2. Position the two crop boxes on the source frame (TOP and BOTTOM).
3. Adjust the split ratio by dragging the red divider.
4. Trim the timeline to the segment you want.
5. Pick a platform and quality preset.
6. 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
Instagram	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
WhatsApp	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

MIT