# Ultrawidify

> 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.

Canonical page: [https://chrome-stats.com/d/ultrawidify](https://chrome-stats.com/d/ultrawidify)

## Overview

- **ID:** `ultrawidify`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Tamius Han
- **Category:** appearance,photos-music-videos,other
- **Daily users:** 6,974
- **Weekly downloads:** 238
- **Rating:** 4.15 / 5 (124 ratings)
- **Version:** 5.1.7
- **Last updated:** 2024-01-28
- **First published:** 2016-10-16
- **Size:** 2.91 MB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/ultrawidify/)
- **Website:** [https://github.com/xternal7/ultrawidify](https://github.com/xternal7/ultrawidify)

## Description

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.

## Rankings

- #958 — Overall
- #133 — Other extensions
- #147 — Appearance
- #156 — Photos, Music & Videos
- #99 — hulu
- #144 — increase

## Permissions and access

### Permissions

- `storage`
- `activeTab`
- `<all_urls>`

### Content script matches

- `*`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

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.

## Similar extensions and apps

- [Ultrawider — 21:9 Video Fill](https://chrome-stats.com/d/ultrawider-21-9-video-fill) — 1 users
- [UltraWideo](https://chrome-stats.com/d/ultrawideo) — 15,299 users, 4.38 / 5
- [Ultrawidey](https://chrome-stats.com/d/ultrawidey) — 165 users, 3.67 / 5
- [Ultrawide Video – Zoom Fill & Remove Black Bars](https://chrome-stats.com/d/ultrawide-video-zoom-fill) — 5 users, 5.00 / 5
- [Video Plus](https://chrome-stats.com/d/video-plus) — 82 users, 3.90 / 5
- [Video Aspect Ratio Resizer 🎥](https://chrome-stats.com/d/video-aspect-ratio-resizer) — 277 users, 3.33 / 5
- [SuperWideZoom](https://chrome-stats.com/d/super-wide-zoom) — 63 users, 3.50 / 5
- [YouTube Dynamic Web Fullscreen](https://chrome-stats.com/d/youtube-dynamic-web-fullscreen) — 9 users
- [UltraWide Video 21:9](https://chrome-stats.com/d/ultrawide-video-21-9) — 2,703 users, 4.11 / 5
- [Youtube Video Effects](https://chrome-stats.com/d/youtube-video-effects) — 118 users, 4.49 / 5
- [Ultrawide Netflix](https://chrome-stats.com/d/ultrawide-netflix) — 795 users, 3.83 / 5
- [YouTube Fullscreen Fit](https://chrome-stats.com/d/youtube-fullscreen-fit) — 1,460 users, 4.19 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/ultrawidify)