How to do it, step by step
- Select the vertical video: the app shows the detected aspect ratio.
- Leave the aspect ratio on Keep original.
- Choose the compression level (Good quality is a good starting point).
- Compress and download the MP4.
When this is useful
Upload videos on a limited connection
A smaller file uploads faster from the phone.
Send the video to whoever will post for you
Send a light version by message or email.
Tips for a good result
- Keep Keep original: that way a 9:16 video stays 9:16.
- Avoid a resolution lower than 720p if the video is posted full screen.
What this tool does not do
- Changing the aspect ratio resizes without cropping: a horizontal video set to 9:16 comes out stretched, not framed.
- The app does not crop or reframe the video.
- Platforms recompress the video when publishing: there is no guarantee of final quality.
- The new file carries the “WebFaz.com” credit in the metadata (comment and artist).
Frequently asked questions
- Does the app convert a horizontal video to vertical?
- Not properly: it resizes without cropping. To reframe, use the WebFaz Video Editor.
- What is the Reels aspect ratio?
- Vertical 9:16. The app identifies it and keeps it by default.
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Text written by Marcelo Amantino · updated October 18, 2026 · who we are