What is TikTok Video Resizer?

Resize any video to TikTok's 9:16 vertical format (1080×1920) for free. Upload your video, pick a fill or crop mode, preview the result, and download — everything stays on your device.

Re-encodes any source video to TikTok's required 1080×1920 portrait frame using WebCodecs and ffmpeg.wasm. Three fill modes solve different problems: crop trims to fill the frame (loses sides), fit-with-blur keeps the full video and fills empty space with a blurred copy (TikTok-native look), fit-with-colour adds solid bars. Quality presets keep file size sensible — medium is enough for most uploads.

How to use

1. Upload a video file in any common format (MP4, MOV, WebM).
2. Choose fill mode: crop to fill, fit with blur background, or fit with solid color.
3. Preview the result and download your TikTok-ready 1080×1920 video.

When to use

• Repurposing landscape 16:9 footage from a DSLR or webcam for TikTok or Reels.
• Resizing a square Instagram video to TikTok's portrait format without re-shooting.
• Preparing vertical ad creatives at exactly 1080×1920 before scheduling them on a paid campaign.

Result

You filmed a landscape 16:9 cooking video and need it for TikTok. Upload it, select 'blur background' fill mode to keep the full video visible with blurred edges filling the vertical frame, and download.

FAQ

Which fill mode should I pick for a landscape video?

Fit-with-blur looks the most native on TikTok — your full landscape video sits in the centre, with a blurred copy filling the rest of the vertical frame. Crop-to-fill loses the left and right thirds; pick the Crop Focus (Top, Center, or Bottom) so the part you care about stays in frame.

Why does the output look blurry or pixelated?

Either the source resolution was below 1080×1920 and got upscaled, or the quality preset is set to Low. For decent results, use a source at least 720p and pick High quality. The progress bar shows the encoder finishing the second pass for sharper output.

How big can the input video be?

Practical limit is around 500 MB or 5 minutes, because all encoding runs in your device's memory. Longer clips work but slow down dramatically. For long footage, use the built-in trim slider to keep just the section you need before resizing.

Does TikTok actually require exactly 1080×1920?

TikTok accepts other resolutions, but 1080×1920 (9:16, 30 fps) is what its compression pipeline expects — anything else gets re-compressed and can lose detail. Sticking to the spec preserves the most quality after TikTok's server-side processing.

Will the audio track come across cleanly?

Audio is copied directly when possible (AAC stays AAC) so quality is unchanged. If the source uses an unsupported codec, it gets re-encoded to AAC 128 kbps stereo at 44.1 kHz — close to inaudible difference for vocals and music.

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