The short version
4K Video Upscaler runs entirely in your browser. The video you choose is decoded, upscaled on your own graphics hardware (WebGPU) and re-encoded on your device. No video, frame, thumbnail or result is ever uploaded to us or to anyone else. There are no accounts, no sign-up and no payments, so we hold no profile about you.
What stays on your device
- Your videos and results. The video you pick and its upscaled result stay in this browser — nothing is uploaded — and old files are cleaned up automatically. The home page can list them because the browser also notes when they expire. You can also clear this site's data at any time in your browser settings.
- Device details used for settings. The page reads your screen size, whether the browser reports a phone, and what your graphics adapter supports, in order to pick sensible defaults and time estimates. These values are used in the page only and are not transmitted. If the graphics chip stops responding, the page also keeps the time in this browser's local storage and uses it only in the next hour, to explain — after a reload too — why the graphics chip is unavailable; the time itself is never transmitted, and the anonymous usage events below carry at most a band such as “1–5 min”.
What is processed when you load the page
Like any website, delivering the page involves some data:
- Server logs. Our hosting provider (Cloudflare) receives your IP address, browser user agent, the requested URL and the time of the request in order to serve the page, defend against abuse and produce aggregate traffic statistics. The country derived from your IP address is used once, on your first visit, to open the Chinese version for visitors from mainland China; every other visitor starts on the English version and picks a language from the menu.
- Language cookie. A single functional cookie,
PARAGLIDE_LOCALE, remembers the language you chose for up to one year. It contains only a two-letter language code such asen,zhorde. - Analytics and ads (only if enabled). We may enable privacy-friendly or standard web analytics (Plausible or Google Analytics) to measure aggregate usage such as page views, device type and country, together with anonymous usage events — which settings were chosen, whether a job finished, how long a frame took — and, to tell first-time visitors from returning ones, a visit counter kept only in your browser's local storage (two numbers on this site's origin; what leaves the browser is a band such as “2–3 visits”, never the counter or any identifier), and Cloudflare Web Analytics, which measures page speed in your browser without cookies. We may also show advertising through Google AdSense. When these are enabled their scripts load from the respective provider and are governed by that provider's privacy policy; Google may set cookies for ad delivery. Video content — the file, its name and its frames — is never part of any analytics or advertising data.
We do not sell personal data and we do not build profiles of visitors.
Cloud-access requests
The guide page lets you ask for the cloud version by email. When you send that request — from your own mail app, from Gmail or Outlook on the web, or by copying the text — we receive your email address and what you typed (what you tried, your footage, optionally your device). It is kept in our mailbox, used only to contact you about cloud access, and shared with no one. Write to the same address to have it deleted. How the cloud version itself handles footage is described before anyone sends any.
Data sharing
We share nothing about your videos because we never receive them. Request logs are processed by Cloudflare as our infrastructure provider; analytics or advertising data, when those features are enabled, is processed by the named provider. We may disclose log data if required by law.
Security
Processing on your own device removes the largest risk: there is no server holding your files. The site is served over HTTPS, and the application code only contacts the hosting provider and, when enabled, the analytics and advertising providers listed above.
Children
The service is a general-purpose tool and is not directed at children under 13. Apart from the cloud-access request described above, we do not knowingly collect personal information from anyone.
Your rights
Because we keep no account or content data, there is normally nothing to access, correct or delete on our side. To stop analytics or advertising cookies, use your browser's cookie controls or a content blocker; to remove upscaled outputs, clear this site's storage in your browser.
Changes
We will update the date at the top of this page whenever this policy changes. Material changes will be visible on this page before they take effect.
Contact
Questions about this policy can be sent to hello@4kvideoupscaler.com.