Video Upscaler

Enlarge a video to a higher resolution, up to 4K, with sharp bicubic scaling that runs entirely in your browser.

FreeBrowser-basedInstant

Your files are processed locally in your browser and are not uploaded to our servers. The video is read, upscaled, and re-encoded entirely inside your browser using WebCodecs and WebGL. It is never uploaded to a server, and the result is built in your browser's memory and saved straight to your device.

How to use Video Upscaler

Drop in an MP4, MOV, WebM, or MKV video, choose how much to scale it (1.5×, 2×, 3×, or 4×, up to 4K), set a sharpening level and an output quality, and the tool re-renders every frame at the larger size and saves a new video. Each frame is resampled with a bicubic filter that is clamped so it doesn't ring around edges, then optionally sharpened with a halo-limited unsharp mask. Before you start, a side-by-side 100% crop of any frame shows exactly what your settings do compared with plain browser scaling. Audio is kept as it is whenever the output format allows. Everything happens on your device, so the video is never uploaded. This is classical upscaling, not AI: it makes edges cleaner and the picture fit a bigger screen, but it can't recover detail that was never recorded.

Key features

  • Upscales to 1.5×, 2×, 3×, or 4×, up to 4K UHD (3840 × 2160)
  • Bicubic resampling with anti-ringing, so edges stay clean
  • Optional sharpening with four levels, limited to avoid halos
  • Side-by-side 100% crop of any frame to compare against standard scaling
  • Output as H.264 MP4 or VP9 WebM, with three quality levels
  • Audio kept without re-encoding whenever the output format allows
  • Progress, time remaining, and a cancel button for long videos
  • Runs entirely in your browser, so the video is never uploaded

Practical use cases

  • Enlarging old 480p or 720p clips so they fill a modern screen
  • Preparing 1080p footage for a 4K timeline or display
  • Giving a low-resolution screen recording a cleaner look at a larger size
  • Producing a bigger version of a clip without sending a private video to an online service

Supported formats

Accepted: mp4, mov, webm, mkv — Output: mp4, webm

Limitations

  • This is classical upscaling, not AI, so it can't restore detail that isn't in the source
  • Output is capped at 4K UHD (3840 × 2160); videos already at or above that can't be scaled up
  • Input is limited to 1 GB and 10 minutes, and the finished video is held in browser memory, so long clips can be slow on low-memory devices
  • Needs a browser with WebCodecs and WebGL2; some codecs, such as HEVC, ProRes, and 10-bit HDR, may not decode
  • HDR and 10-bit video isn't specially handled, so its colors may look different in the result
  • Processing speed depends on your device's video encoder, and background tabs run slower

Frequently asked questions

Is this AI video upscaling?
No. It uses classical resampling: a bicubic filter to enlarge each frame and an optional sharpening pass to crisp up edges. That makes a video look cleaner and fit a bigger screen, but it can't add detail that the original never recorded, which is what AI upscalers try to do. Use the frame comparison to see what to expect on your own footage before you process it.
Is my video uploaded to a server?
No. The file is decoded, enlarged, and encoded inside your browser, and the finished video is saved from your device's memory. Nothing is sent to this site or anywhere else.
How much sharper will the video look?
It depends on the footage. Clean, well-lit video enlarged by a modest amount, such as 720p to 1080p, usually looks noticeably cleaner than the same video stretched by a player or editor. Heavily compressed or blurry video stays soft, because the detail is gone from the source. Medium sharpening suits most footage, Strong can look harsh on noisy video, and Off keeps the result closest to the original.
Which upscale setting should I choose?
2× is the usual choice, for example 1080p to 4K or 720p to 1440p. 1.5× suits 720p to 1080p. 3× and 4× enlarge small clips, such as 480p or lower, but the larger the jump the softer the result looks. Output is capped at 4K UHD (3840 × 2160), so scales that would go past it are switched off for your video.
Why can't I open my video?
The tool relies on your browser to decode the video. Most H.264 and VP9 files work, but some codecs, such as HEVC (H.265) on browsers without support for it, ProRes, or 10-bit HDR files, may not decode. If your file is rejected, try another browser, or convert the video to a standard H.264 MP4 first.
How long does it take and why is it slow on my device?
Time depends on the video's length, the output size, and your computer's video encoder. Devices with hardware video encoding can process faster than real time, while others may take several times the video's length. Keep the tab open and visible while it runs, since browsers slow down background tabs.
Is the audio kept?
Yes, in most cases. The audio track is copied across without re-encoding whenever the output format supports its format, so there is no quality loss. If it can't be kept, the result note says so.

Part of Video Tools