Free Video Upscaler — 4K Output

2x upscaling doubles both the width and height of your video. A 720p (1280×720) video becomes 1440p (2560×1440). A 1080p (1920×1080) video becomes 4K (3840×2160). The process uses WebGL shader-based interpolation to preserve edges and motion detail.

Yes — completely free, no sign-up, no credit card, no watermark on the output. The upscaler runs in your browser using WebAssembly so there are no server costs to pass on.

Due to browser WebAssembly memory limits, the upscaled output can be up to approximately 10 megapixels (e.g., 2240×2240, or roughly 1080p input → 4K output). For larger source videos, upscaling may be blocked with an error message advising you to use a smaller input.

Upscaling increases resolution — it cannot recover detail that was never in the original. However, our WebGL-based upscaler preserves edges and motion better than simple bicubic interpolation, producing visibly sharper results than software downscaling would.

Yes. Add a watermark mask region and enable the upscale checkbox in the same processing pass. Both operations are applied simultaneously — the output is both watermark-free and upscaled.

Input: MP4, MOV, WebM, AVI. Output: MP4 (H.264). The upscaled video is exported as a standard MP4 that plays on all devices and platforms.

Yes — the tool runs in Chrome and Safari on iOS and Android. Processing speed depends on device GPU. Upscaling short clips (under 30 seconds) works well on modern smartphones.