Resize a Video Online
Adapt your videos to social media formats (vertical 9:16, square 1:1, landscape 16:9) or to exact dimensions, free. Everything runs entirely in your browser, so your file is never sent to a server.
Drag and drop a video here, or click to choose a file
MP4, MOV, WebM, MKV, AVI — up to 500 MB. Nothing is sent to a server.
Output format
Target dimensions: 1080×1920 · the original aspect ratio is preserved (letterboxing if needed).
Why resize a video in the browser?
Unlike traditional online tools, nothing is uploaded: the video is processed locally by your browser. It's faster, more private, and there's no server-imposed rate limit.
Perfect for fitting a video to the right format before posting on TikTok, Instagram or YouTube — no distortion, no watermark.
Frequently asked questions
Are my files uploaded to a server?
No. Resizing runs entirely in your browser (WebCodecs). Your video never leaves your device.
Which social media formats are available?
The most common formats: vertical 9:16 (TikTok, Reels, Shorts), square 1:1 (Instagram feed) and landscape 16:9 (YouTube). You can also enter custom dimensions.
Will the video be distorted?
No. By default, the original aspect ratio is preserved (adding bars if needed) to avoid any distortion.
Is the tool free?
Yes, resizing a video is completely free with no sign-up. Voxdub also offers an online dubbing studio, with a 7-day free trial.
Need to dub or subtitle this video?
Voxdub is an online dubbing and rythmo band studio. Import your video, generate subtitles, dub into multiple languages.
Try Voxdub for free7-day free trial · no install · rated 4.5/5 on Google