Aspect Ratio Converter is a free, in-browser tool that reframes a video to 9:16, 1:1, 4:5, or 16:9. Crop fills the frame, Blur fill keeps the whole shot over a blurred copy, and Color fill keeps the shot over a solid color. The output is an H.264 MP4 at 1080 pixels on the short side, with no watermark.
Best for
- convert video to 9:16
- resize video for Reels
- horizontal to vertical video
- blur background vertical video
Overview
Aspect Ratio Converter turns a video made for one placement into another, for example a 16:9 clip into a 9:16 vertical for Reels, Shorts, or TikTok. It runs in your browser with no upload and no account.
The video is re-encoded to H.264 at high quality. Output is 1080 pixels on its short side, or smaller if the source is smaller, so a small clip is never upscaled.
What you can do
- Four target ratios
- 9:16, 1:1, 4:5, and 16:9.
- Crop
- Fill the frame, with a position slider to keep your subject in view.
- Blur fill
- Fit the whole shot over a blurred copy of itself.
- Color fill
- Fit the whole shot over a solid color you pick.
- Clean output
- H.264 MP4 at up to 1080 pixels on the short side, no watermark.
How to use Aspect Ratio Converter
- 1Open the converter. Go to /aspect-ratio-converter. No account is needed.
- 2Add a video and pick a ratio. Choose 9:16, 1:1, 4:5, or 16:9.
- 3Choose a fit. Pick Crop, Blur fill, or Color fill, and adjust the crop position if needed.
- 4Convert and download. Convert and download the MP4.
Questions
- Is there a watermark?
- No. The converted video has no watermark.
- What resolution is the output?
- 1080 pixels on the short side, for example 1080×1920 for 9:16, or smaller if your source is smaller.
- Can I keep the whole frame instead of cropping?
- Yes. Blur fill and Color fill fit the entire shot and fill the remaining space.
Concepts & tutorials
Learn the ideas behind Aspect Ratio Converter and see it inside a full AI filmmaking workflow.
Key concepts
Try Aspect Ratio Converter
Free and in your browser, no account needed to start.