Resize videos to 1080p, 720p, 480p, or custom dimensions. Free, private, runs in your browser.
100% private — your files and text never leave your browser. All processing happens locally on your device.
Choose a file
or drop it here
Target size
Quality
Resize Video uses FFmpeg.wasm to scale the video locally to 1080p, 720p, 480p, or custom dimensions. This keeps private recordings, client clips, and drafts on your device instead of sending them to a media server.
The default setting preserves aspect ratio and pads custom dimensions when needed. That avoids stretched faces and distorted screen captures. If you intentionally need exact stretched dimensions, you can turn aspect-ratio preservation off.
Resizing is a full transcode, so every frame is decoded and encoded in the current browser tab. Short clips work best. Very long, 4K, or high-bitrate files can be slow or exceed browser memory.
No. The video is decoded, scaled, and encoded inside your browser using FFmpeg.wasm. Convertful does not upload or store it.
Yes. Keep aspect ratio is enabled by default. Custom width and height are padded as needed instead of stretching the picture.
Resizing requires transcoding every video frame. That is much heavier than removing an audio track, especially for long clips or high-resolution sources.
The resized output is an MP4 with H.264 video and AAC audio unless you remove audio. This is chosen for broad playback compatibility.
Try a shorter file, a lower preset such as 480p, or a desktop browser with more available memory. Browser tabs have less memory than desktop video apps.