Video Upscaler
Increase video resolution 2× or 4× using a fast single-pass Lanczos scaler in your browser. No model download required. Your video never leaves your device.
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Single-pass Lanczos upscaling — 2× or 4× in your browser
How it works
- Drop an MP4, WebM, or MOV clip — input up to 1080p (1920px longest edge)
- The clip is upscaled with a single-pass Lanczos scaler — no model download required
- Output: 2× → up to 3840×2160 (4K) · 4× → up to 7680×4320 (8K) — capped at 8192px
- Estimated time: ~3–5 min for a 30s clip at 720p · ~10–15 min at 1080p (varies by device)
- Your video is never sent to any server — 100% private
Common use cases
Upscale old footage
Bring vintage or low-resolution video recordings up to modern HD clarity.
Social media clips
Increase resolution of short clips before uploading to TikTok, Reels, or YouTube Shorts.
Client deliverables
Provide higher-resolution outputs without re-shooting when only a standard-def master exists.
Archive restoration
Upscale digitised archive footage to improve legibility and visual quality.
Frequently asked questions
Is my video uploaded to a server?
No. The Lanczos scaler runs entirely in your browser. Your video never leaves your device.
What does 4× mean for video?
Every frame is enlarged to 4× its original pixel count. A 720p input (1280×720) becomes 5120×2880 (5K). 1080p input (1920×1080) is the maximum — it produces 7680×4320 (8K) which is the browser GPU limit.
Can I queue multiple videos?
Yes. Drag in multiple files and they'll queue up automatically. You can cancel or retry any job individually.
What format is the output?
WebM (VP9). All major platforms support it. You can convert to MP4 with the Video Editor or a format converter after exporting.
Related tools
Why it's different
Most video upscalers require server uploads or expensive apps. NSS runs Lanczos upscaling entirely in your browser — private, free, no upload.
100% Private
Everything runs on your device using in-browser AI. Nothing is transmitted to any server — not the file, not metadata, not filenames.
True Alpha Channel
We export straight (non-premultiplied) alpha so transparent PNGs open with a real checkerboard in Photoshop and Figma — no black halos.
Free Forever
No paywall, no watermark, no premium tier. The full-quality AI is free, supported by non-intrusive ads.
Works Offline
Once loaded, the app and AI models cache locally. Process files without an internet connection. Installable as a desktop or mobile app.
Ready to try it?
Free, private, no signup.
Upscale a video →