Smart Upscale
SmartUpscale applies integer scaling to webpage images in Firefox and Chrome to reduce blur on high-density displays.
About Smart Upscale
Smart Upscale is a browser extension for Firefox and Chrome that applies integer scaling to images on webpages. Integer scaling avoids blurring when an image's size in physical pixels is a whole-number multiple of its real size. The extension is intended for high-density displays (HiDPI, Retina, 4K and 5K monitors) at operating-system zoom levels such as 200%. The source states that the difference in sharpness is most noticeable on screenshots of programs, charts, and other line-art images.
The scale is calculated separately for each image. Images are processed when loaded, when browser zoom changes, and after some dynamic page changes. The extension starts working immediately after installation without a browser restart. Several options are available in the browser's Add-on Manager, including a maximum zoom level for blur prevention, processing of dynamically added images, and a global option to disable blur for all elements. The source notes that the global option may distort images displayed at non-integer zoom levels. The source also lists limitations: it processes only HTML IMG elements, not images set via CSS backgrounds or pseudo-elements, and dynamic page tracking is partial.
Key features
- Applies integer scaling to images embedded as HTML IMG elements
- Calculates the scale factor individually for each image
- Reprocesses images on page load and on browser zoom changes
- Optional limit on the maximum zoom level for blur prevention
- Optional processing of images added to the page dynamically
- Optional global setting to disable blur for all page elements
Best for: Users with high-density or 4K displays who view screenshots, charts, or line-art images in Firefox or Chrome.
Good for
- Prevents blurring of images whose physical pixel size is an integer multiple of their real size
- Works immediately after installation without requiring a browser restart
- Lets users cap the zoom level at which blur prevention applies
Watch out for
- Does not process images embedded via CSS backgrounds or pseudo-elements
- Images opened directly in a separate tab may sometimes not be processed in Firefox; Chrome behavior is unknown
- Dynamic page changes are tracked only partially, and resizing via CSS is not tracked
Smart Upscale at a glance
- Category
- Software & Utilities › Browser Extensions
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Browser extension, Web, Windows
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Smart Upscale FAQ
Does Smart Upscale need a browser restart after installation?
No. The source states that the extension starts working immediately after installation and does not need a browser restart.
Can I limit the zoom level at which blur prevention is applied?
Yes. The maximum image zoom option limits the zoom level at which blur is prevented. The default value of 0 means there are no limits.
Does the extension process images used as CSS backgrounds?
No. The source states that it only processes images embedded in the page as HTML IMG elements, not CSS background images or pseudo-element images.
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