Resize Video for TikTok
Convert any video to 9:16 vertical (1080×1920) — crop to fill the frame or fit with clean bars.
TikTok, Instagram Reels, and YouTube Shorts all use the same vertical 9:16 frame at 1080×1920. Upload a landscape video as-is and the platform letterboxes it into a small strip — which tanks watch time. This tool converts any video to a proper full-frame vertical.
Choose Crop to fill to zoom into the center of the frame with no bars (best for footage with a central subject), or Fit with bars to keep the entire frame visible with black padding above and below. The output is a 1080×1920 H.264 MP4, encoded in your browser with nothing uploaded anywhere.
How to resize video for tiktok online
- 1Drop your video into the box above — landscape, square, or any aspect ratio.
- 2Pick Crop to fill for a full-frame look, or Fit with bars to keep everything visible.
- 3Click Resize Video and wait for processing to complete.
- 4Download the 1080×1920 MP4 and upload it to TikTok, Reels, or Shorts.
Frequently asked questions
What is the correct video size for TikTok?
TikTok's native format is 9:16 vertical at 1080×1920 pixels, MP4 with H.264 video — exactly what this tool outputs. The same format is correct for Instagram Reels and YouTube Shorts.
Should I crop to fill or fit with bars?
Crop to fill looks native and performs better, but trims the left and right edges of landscape footage. Use Fit with bars when important content sits near the edges — like gameplay HUDs or text.
Does this work for Instagram Reels and YouTube Shorts?
Yes — all three platforms share the 9:16, 1080×1920 vertical format, so the output works unchanged on each.
Is my video uploaded to your servers?
No. Resizing runs entirely in your browser via WebAssembly, so your footage stays on your device.
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