Ultrawidify

Name: Ultrawidify
Rating: 4.1322 (121 reviews)
Author: Tamius Han

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.

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Features & Capabilities

Ultrawidify is a Chrome extension designed to enhance your video viewing experience on ultrawide (21:9) and superwide displays. It automatically detects and corrects improperly encoded videos on platforms like YouTube, Netflix, Twitch, Vimeo, and Streamable, removing distracting black bars to maximize screen usage.

Key features include automatic aspect ratio detection with real-time adjustment, manual crop controls with preset aspect ratios (21:9, 18:9, 16:9, fit width/height), various video stretching options, and the ability to align video playback off-center for personalized layouts. Advanced settings allow users to manually specify video player elements for compatibility with less common sites. Ultrawidify is optimized specifically for Google Chrome and prioritizes smooth playback while offering customizable controls to fit your screen perfectly. Share your fixes and help improve the extension through community contributions on GitHub.

User Growth & Download Statistics

Add-on

By:

Daily users:

Rating:

Version:

5.1.7 Last updated: 2024-01-28

Version code:

5683713

Creation date:

2016-10-16

Risk:

Permissions:

storage
activeTab
<all_urls>

Content scripts matches:

Size:

2.91MB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-19

Compare stats and ranking:

Ranking

# 973

Other rankings

#146 in Other extensions ▼ 1

#148 in Appearance

#157 in Photos, Music & Videos

#119 in hulu keyword 22 ▲ 1

#143 in increase keyword 53

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Other platforms

Ultrawidify (v6.3.0)

60,000 3.38

(331)

Ultrawidify (v5.1.7)

30,917 3.50

(59)

For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Tamius Han

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/ultrawidify/

Website:

https://github.com/xternal7/ultrawidify

User Reviews

Ultrawidify can greatly improve video viewing by removing black bars and enabling 16:9 stretching on popular sites, including 4:3 content on older displays. When it functions, it provides smooth fullscreen without crops and offers adjustable stretching options. However, several reviews report stability and performance issues, including grey screens, unresponsive tabs, lag, and flicker during fullscreen use. Reliability also appears variable across versions, with some noting regressions after updates. Overall, it delivers a notable improvement for many users, but persistence of bugs limits trust.

Pros

Eliminates black bars and enables 16:9 stretching across YouTube, Twitch, and other streaming sites.
Improves fullscreen viewing without cropping for a wide range of content.
Offers configurable stretching options, including a 16:9 stretch hybrid, in the settings.
Helpful for 4:3 content or CRT setups by stretching to widescreen.

Cons

Stability issues: can cause a grey screen with an unresponsive tab, sometimes requiring a browser restart.
Performance problems: lag, flicker, or slow behavior on some videos and during fullscreen transitions.
Reports of reliability regression over time, with some users noting bugs after updates and that older versions seemed more stable.

Recent reviews

by Fi*****, 2026-03-06

by No*****, 2026-03-02

It worked for half a day.

by Fi*****, 2025-12-23

View all user reviews ›

Is Ultrawidify Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Ultrawidify requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Ultrawidify has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
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