Resize Videos Online, Free
Change video resolution to 1080p, 720p, 4K, or any custom size. Powered by WebAssembly — your files never leave your device.
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How to Resize a Video
- Drop your video files — Drag and drop or select MP4, WebM, MOV, or AVI files from your device.
- Choose your target resolution — Select a standard resolution (1080p, 720p, 480p, etc.) or enter custom dimensions. Toggle aspect ratio lock as needed.
- Download instantly — Click “Resize” and download your resized videos individually or as a ZIP.
Why Resize Videos?
Video files are often much larger than necessary for their intended use. Resizing helps you:
- Reduce file size for sharing — A 4K video downscaled to 1080p can be 3–4x smaller, making it practical for email, messaging, and social media uploads.
- Meet platform requirements — Different platforms have different resolution requirements. Resize MP4 files to the exact dimensions each platform expects.
- Optimise for web embedding — Serving 4K video to mobile viewers wastes bandwidth. Resize to match the actual display dimensions.
- Save storage space — Batch resize video libraries to reclaim disk space without re-recording.
Supported Resolutions
- 4K (2160p) — 3840 × 2160px
- 1440p (QHD) — 2560 × 1440px
- 1080p (Full HD) — 1920 × 1080px — most common
- 720p (HD) — 1280 × 720px — good for web
- 480p (SD) — 854 × 480px
- 360p — 640 × 360px — smallest practical size
- Custom — any width and height you need
Also check out our image resizer and PDF resizer — all free and browser-based.
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Frequently Asked Questions
- Do my videos get uploaded to a server?
- No. All video processing happens in your browser using FFmpeg compiled to WebAssembly. Your videos never leave your device.
- What video formats are supported?
- MP4, WebM, MOV, and AVI. The output format matches your input — an MP4 input produces an MP4 output.
- How long does video resizing take?
- It depends on the file size and your device's processing power. A 1-minute 1080p video typically takes 30–60 seconds on a modern laptop. Larger files or 4K content will take longer.
- Is there a file size limit?
- We recommend files under 500MB for smooth processing. The actual limit depends on your device's available memory. If processing fails, try a smaller file.
- Will resizing reduce video quality?
- Downscaling (e.g., 1080p to 720p) slightly reduces detail but produces a smaller, more practical file. Upscaling won't add detail but will increase file size. Audio is preserved unchanged.
- Does it work on mobile?
- Video resizing requires significant processing power. It works on modern mobile browsers but will be slower than on desktop. For large files, we recommend using a desktop browser.