TikTok Video Resizer
Turn horizontal or square clips into full-screen vertical TikTok videos. Choose how the picture fills the 9:16 frame, with a blurred copy of the video behind it, a centre crop or black bars, and download an MP4 ready to upload.
- Files stay on your device
- No sign-up
- Free to use
TikTok format
Fill the frame
Landscape videos look best with a blurred background; crop works when the subject is in the middle.
Processing happens on your device with FFmpeg. Keep this tab open; long or high-resolution videos can take several minutes.
How to use TikTok Video Resizer
- Drop a video onto the upload area. Its resolution and length are shown under the preview.
- Choose the TikTok format: 1080 × 1920 for best quality, 720 × 1280 for a smaller file, or square.
- Choose how to fill the frame: blurred background, crop to fill or black bars.
- Select Resize for TikTok, preview the result and download the MP4.
TikTok Video Resizer features
TikTok’s native size
1080 × 1920 pixels, 9:16, at 30 frames per second, matching what TikTok displays.
Blurred background fill
Keeps the whole landscape picture while filling the screen with a soft, blurred copy instead of black bars.
Crop to fill
Zooms into the centre of the video for an edge-to-edge look when the subject is in the middle.
Compatible MP4
H.264 video and AAC audio, the format TikTok and every phone accepts.
Smaller 720p option
Faster processing and uploads for long clips.
No upload to us
The video is converted on your device with FFmpeg in WebAssembly.
When to use TikTok Video Resizer
- Reposting YouTube or camera footage on TikTok without awkward bars.
- Converting gameplay, webinar or screen recordings to vertical format.
- Reusing horizontal ads and product videos for TikTok campaigns.
- Preparing the same vertical video for Reels and YouTube Shorts.
- Making square clips fill the phone screen.
TikTok Video Resizer FAQ
What is the best video size for TikTok?
1080 × 1920 pixels in a 9:16 vertical ratio. TikTok accepts other shapes, but they are shown with bars and take up less of the screen.
Will the blurred background look professional?
It is the most common way to present horizontal footage on vertical platforms. The blurred layer uses the video’s own colours, so it blends in, while the full picture stays sharp in the middle.
Does this work for Instagram Reels and YouTube Shorts?
Yes. Reels and Shorts use the same 9:16 shape and resolution, so the same file works on all three.
How long does processing take?
It depends on your device and the video length. A one-minute 1080p clip typically takes one to several minutes, because a new video has to be encoded. Keep the tab open until it finishes.
Is the audio kept?
Yes. Audio is kept and converted to AAC. If the original has no sound, the result simply has none.
Making horizontal video work on a vertical platform
TikTok was designed around a phone held upright, so its videos are taller than they are wide. Most cameras, screen recorders and older footage are the opposite. Uploading a landscape video unchanged leaves most of the screen empty, which makes the content feel small and less engaging in a feed of full-screen clips.
Three approaches fill the frame. Cropping keeps the video edge to edge but removes more than half of a 16:9 picture, which suits talking heads and centred action. Bars keep everything but look unfinished. The blurred background, popularised by vertical video apps, places the full picture over an enlarged, blurred copy of itself, so the frame is filled with matching colour and movement.
Resizing to the platform’s exact resolution has another benefit: TikTok processes uploads to its own specification. Supplying a 1080 × 1920 file at 30 frames per second in H.264 avoids an extra conversion step on upload, which can otherwise soften fine detail.
For captions, stickers and on-screen text added in TikTok, remember the app overlays buttons on the right side and the caption at the bottom. Keep important parts of the picture in the centre so they remain visible.