Aspect ratio fixer for Youtube. Allows improperly encoded videos to properly fit ultrawide and superwide displays (e.g. 21:9) — and it attempts to do so automatically.

  • Ultrawidify
  • Ultrawidify
  • Ultrawidify
  • Ultrawidify
What is Ultrawidify?
Ultrawidify is a Firefox add-on that greatly improves video viewing on ultra and super-wide displays. Capable of auto-detecting and fixing aspect ratios for a smoother viewing experience, it supports a wide range of video platforms from Youtube to Twitch, Vimeo to Streamable, and more. In cases where auto-detection isn't possible due to site restrictions, this handy tool provides manual adjustment options. Further features include video alignment, player detection override and stretch video capabilities for improved versatility.
Users: 5,702 ▼ -6
Rating: 4.16 (107)
Version: 5.1.7 (Last updated: 2024-01-28)
Creation date: 2016-10-16
Weekly download count: 198
Firefox on Android: No
Risk impact: Moderate risk impact
Risk likelihood: Moderate risk likelihood
Manifest version: 2
  • storage
  • activeTab
  • <all_urls>
Size: 3.05M
URLs: Website
Stats date:

Other platforms

Ultrawidify (v5.1.7)
3.62 (237) 60,000
Ultrawidify (v5.1.7)
3.40 (53) 26,703
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Need to remove unnecessary black bars from this youtube video you're watching? Ultrawidify is here for you. It should work on Youtube, Netflix, Twitch, Vimeo, Streamable (and on embedded videos that are hosted on these sites). It may work elsewhere as well, but no guarantees.

Important note: This addon is only tested and intended to work with Google Chrome specifically. If you're using a different browser, you're on your own. No, Edge is not Google Chrome (and neither is any other chromium-based browser).


1. AUTOMATIC ASPECT RATIO DETECTION Ensures that video will be cropped without you having to lift a finger. It even re-adjusts crop if aspect ratio changes mid-video. Autodetection is not 100% accurate and has some limitations, but it's accurate enough for most cases.

Autodetection is not supported on all sites. Some sites (e.g. Netflix, Disney+, Hulu) use DRM in order to prevent video piracy, and such protection measures interfere with automatic aspect ratio detection.


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User reviews
User reviews summary
These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
  • Resolves black bar issue on ultrawide screens.
  • Support for various aspect ratios including 18:9 and 21:9.
  • Customizable settings for different streaming services.
  • Can cause lag or performance issues, particularly in fullscreen mode.
  • May be complicated for users to adjust settings frequently.
  • Issues with restoring default values after uninstallation.
Most mentioned
  • Can be laggy or cause performance issues over time.
  • Offers a solution for black bar problems on streaming videos.
  • Requires readjustment of settings for optimal functionality, with a learning curve involved.
Recent reviews
Fixed my twitch and youtube, saved my marriage, cured my stomach ache and drove my kids to lacrosse practice every day. Not a single add on does that, but if you believe in yourself and in Tamius, it is possible. Dont let your memes be dreams!

View all user reviews
Risk impact

Ultrawidify may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.

Risk likelihood

Ultrawidify is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

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