These settings can be overriden on per-site basis.

Enable this extension:
By default, extension will only work on fullscreen videos.

Always On whitelisted sites Never

Enable advanced mode:
In advanced mode, extension will also try to correct video aspect ratio when not in full screen. Useful for e.g. theater mode on youtube.

Always On whitelisted sites Never

Enable autodetection:

Always On whitelisted sites Never

Default stretching mode

Never
Basic
Hybrid
Thin borders

Video alignment:

Left Center Right

Options for this site:

Whitelist Default Blacklist

Automatic detection:

Whitelist Default Blacklist

Default stretching mode

Never
Basic
Hybrid
Thin borders
Default

Video alignment:

Left Center Right Default

Cropping mode

Auto-detect
Reset
21:9
2:1 (18:9)
16:9
Custom

Set custom aspect ratio

Manual zooming and panning

Zoom: 100%

show shortcuts reset

Stretching mode

Normal
Basic
Hybrid
Thin borders

Video alignment:

Left Center Right

Ultrawidify version:

Having an issue?
Report ~~undocumented features~~ bugs using one of the following options: