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Re-encodes every frame, which is slow on a phone. On a phone, stick to clips under about 1 minute (roughly 100 MB); use a computer for longer or 4K videos.
Re-encodes every frame, which is slow on a phone. On a phone, stick to clips under about 1 minute (roughly 100 MB); use a computer for longer or 4K videos.
Resize video dimensions with social media presets. Works entirely in your browser — no files uploaded.
Click to upload or drag and drop
MP4, WebM, MOV (max 500MB)
Our free video resizer lets you resize videos to custom dimensions or popular social media presets. Powered by FFmpeg WebAssembly, all processing happens entirely in your browser — your files are never uploaded to any server.
What video formats are supported?
Video Resizer supports MP4, WebM, and MOV formats. The output is always MP4 for maximum compatibility across devices and platforms.
Is there a file size limit?
You can process videos up to 500MB. Larger files may take longer to process depending on your device's performance.
Does this tool upload my videos to a server?
No. All video processing happens entirely in your browser using FFmpeg WebAssembly. Your videos never leave your device, ensuring complete privacy.
Can I maintain the original aspect ratio?
Yes, toggle the 'Maintain Aspect Ratio' option to keep proportions locked. When enabled, adjusting width or height will automatically update the other dimension to prevent stretching or squashing.
What social media presets are available?
We offer presets for Instagram Reel (1080×1920), TikTok (1080×1920), YouTube Short (1080×1920), YouTube (1920×1080), Twitter/X (1280×720), and Square (1080×1080).
What happens to the audio when resizing?
Audio is preserved exactly as-is when resizing. Only the video dimensions are changed — the audio stream is copied without re-encoding, so there is no quality loss.