Video Resizer
Resize a video to a new resolution — pick a preset like 720p or enter exact pixel dimensions, then export. Free and private: your video is processed entirely in your browser and never uploaded.
or click to browse — MP4, WebM, MOV · stays on your device
Export runs in real time — the video plays through once while it is re-encoded. The result is saved as MP4 or WebM, depending on what your browser supports.
How to resize a video online
- Upload your video. Drag and drop an MP4, WebM or MOV file into the box above, or click it to browse. The file is opened locally — nothing is uploaded.
- Choose the new size. Pick a preset like 1080p, 720p or 50%, or type an exact width and height. Keep the 🔗 lock enabled so the aspect ratio is preserved and the video is never stretched.
- Resize and download. Press Resize video. The clip plays through once while it is re-encoded at the new resolution; then preview the result and download it.
About this tool
This free video resizer changes the resolution of a video without installing any software. Scaling a clip down — for example from 4K to 1080p, or from 1080p to 720p or 480p — dramatically reduces the file size, which makes it perfect for sharing videos by email or chat apps, embedding them on web pages, or saving storage space. The audio track is kept by default, or you can untick Keep audio to export a silent version.
Everything happens locally in your browser using the HTML5 canvas and the MediaRecorder API: the video is decoded, redrawn at the new dimensions and re-encoded on your own device. Your video never leaves your computer, there are no watermarks, no sign-ups and no file limits imposed by a server. Depending on the browser, the exported file is an MP4 or a WebM video.
Frequently asked questions
Why does resizing take as long as the video?
The tool re-records the video in real time using your browser's built-in encoder, so a 2-minute clip takes about 2 minutes to process. Keep the tab open and in the foreground while it runs — background tabs can be throttled by the browser and drop frames.
What format is the exported file?
The browser's native recorder decides: recent Chrome and Edge versions can export MP4, while Firefox and others produce WebM. The download filename always matches the actual format, and both formats play in all modern browsers and most video players.
Is the audio kept when I resize?
Yes — the original audio track is captured and re-encoded along with the video as long as Keep audio is ticked. Untick it to export a muted video, which also makes the file slightly smaller.
Is my video uploaded to a server?
No. Decoding, scaling and re-encoding all happen inside your browser on your own device. That makes the tool safe for private footage, and it also means there is no upload wait before processing starts.