Aspect Ratio for Social
Reframe your video to 9:16, 1:1 or 4:5 for social media — fit with a blurred or solid background, or fill with a draggable focal point. Works entirely on your device.
About this tool
What you provide
- A video file (MP4, MOV, WebM)
- A target ratio: 9:16, 1:1, 4:5, 16:9, or a custom width and height
- Fit with a blurred or solid background, or fill with a draggable focal point
What you get
- An MP4 at the chosen ratio, 1080 px on the short side, with its file size shown
Limits
- This re-encodes the video, so it can take several minutes and is much faster on a computer.
- Videos longer than 5 minutes on a phone or 15 minutes on a computer are refused — trim them first.
- Everything runs on your device, so the video is never uploaded.
How to use it
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Pick your video
Drop a video on the dropzone or tap it to choose one; it loads into a preview above the ratio options.
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Choose a ratio
Pick 9:16, 1:1, 4:5 or 16:9, or pick Custom and type your own Width and Height.
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Choose Fit or Fill
Fit keeps the whole frame and fills the gaps with Blur or a Color you pick; Fill crops to the edges and puts a dot on the preview that you drag to keep the important part in frame.
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Run and save
Tap the run button, which carries the tool's own name "Aspect Ratio for Social", and let the re-encode finish — it reports a percentage and is much faster on a computer — then play the result, read the before-and-after size line and tap Save / Share.
Frequently asked questions
How do I change a video's aspect ratio for social media?
Upload your video, pick the aspect ratio you need, and choose whether to fit (add bars) or fill (crop) the frame, then export. The whole process runs on your device.
Is the aspect ratio tool free to use?
Yes, it's free with no signup required.
Does this tool upload my video to a server?
No, the video is processed entirely on your device and never leaves your device.