Resize Video
Resize video online for free — change the resolution to 1080p, 720p or 480p, or reframe for vertical Reels and TikTok (1080 × 1920), square (1080 × 1080) or 4:5 posts. Choose fit-with-bars, fill-and-crop or stretch, or enter a custom size. Runs privately in your browser.
100% private — your video is processed on your device, never uploaded. Conversion happens on your device; nothing is uploaded.
Processing uses your browser’s built-in video encoders (WebCodecs) through the open-source Mediabunny library — your video is never uploaded. Works best in recent Chrome, Edge and Safari; the output is kept in memory, so very large files (several GB) may need a computer with plenty of RAM.
How to resize a video
- Drop your video in the box.
- Pick a size preset or enter a custom width and height.
- Choose Fit, Fill and crop, or Stretch.
- Click Resize video, preview and download.
What you can use it for
- Make vertical versions for Reels, Shorts and TikTok
- Downscale 4K footage to 1080p or 720p
- Create square videos for feeds and ads
- Match a required resolution for upload forms
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See all free image tools →Frequently asked questions
How do I change the resolution of a video?
Choose a size such as 1280 × 720 and click Resize video.
What's the difference between Fit and Fill?
Fit keeps the whole picture and adds black bars where the shape differs; Fill and crop fills the frame and trims the edges; Stretch distorts the picture to fit exactly.
Can I make a landscape video vertical?
Yes — choose 1080 × 1920 and Fill and crop for a full-screen vertical video, or Fit to keep the whole frame with bars.
Is my video uploaded?
No. The video is read and encoded by your own browser using its built-in video encoders, so it never leaves your device — even large or private videos stay private.
Is there a file size limit?
There's no upload limit. The finished video is held in memory before download, so files up to a few GB work on most computers; very large files need more RAM.
Which browsers work?
Recent Chrome, Edge and Safari work best (they have hardware video encoders). Firefox 130+ works for most files.