One click from any shape to YouTube, Shorts/Reels, square or 4:5 portrait.

How to use

1. Load the video → choose a target size.
2. Choose Pad (keep everything, add bars) or Crop (fill, trim edges).
3. Resize → download the MP4.

About this tool

One clip, four platforms, four different shapes. Instead of re-shooting, resize here: choose the target (YouTube 16:9, Shorts/Reels/TikTok 9:16, feed square 1:1, Instagram portrait 4:5), then pick how it fits — Pad keeps every pixel and letterboxes the gap in black, Crop fills the new frame edge-to-edge and trims the overflow. The FFmpeg engine (one-time ~30 MB engine load) does the scaling and re-encode on your device, so footage never gets uploaded to a 'free converter' queue. Your file never leaves this page — processing runs in your browser via WebAssembly; nothing is uploaded and the file is dropped from memory when you close the tab.

FAQ

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