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How-tosAlvseike Aspect Resizer

How to Change a Video Aspect Ratio Online (16:9 to 9:16)

Reframe landscape video for Shorts, Reels, or TikTok — or the other way around — with blurred bars or a fill, privately in your browser and without a watermark.

Recommended tool: Alvseike Aspect Resizer ↗

Want to change a video aspect ratio for Shorts, Reels, TikTok, or back to landscape? You usually need a resizer (bars or fill), not only a crop.

Steps

  1. Start from the highest-quality master on your device.
  2. Open Alvseike Aspect Resizer.
  3. Pick the target ratio (for example 9:16 or 16:9) and choose pad vs fill.
  4. Export and confirm the frame looks right on a phone-sized preview.

Crop vs reframe

  • Crop when you want to discard edges — see crop video online.
  • Reframe when the whole subject must stay visible inside the new ratio.

After reframing, compress the export if the platform has a size cap.

When you are ready, open the aspect resizer with the button above.

FAQ

How do I turn a 16:9 video into 9:16?

Use an aspect resizer that can pad with blurred bars or fill the frame. That keeps the full subject visible instead of hard-cropping the sides — unless a crop is what you want.

Is cropping the same as changing aspect ratio?

Not always. Cropping discards edges. Reframing with bars keeps the whole picture inside a new ratio. Pick crop when you want to zoom into a region; pick resizer when you must keep everything.

Do I need to upload the video?

No. Prefer a local browser tool so the file stays on your device while it reframes.