These settings can be overriden on per-site basis.

Enable this extension:

Always On whitelisted sites Never

Enable autodetection:

Always On whitelisted sites Never

Video stretching options are currently experimental. If you find any bugs, please consider reporting the problem. See 'About ultrawidify' tab for details.

Default stretching mode

Never
Basic
Hybrid
Thin borders

Options for this site:

Whitelist Default Blacklist

Options for this site:

Whitelist Default Blacklist

Cropping mode

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

Custom aspect ratio

Save
Aspect ratio can be entered in any of these forms (without quotes):

fraction (width/height, e.g. 16/10, 2560/1080, etc.)
ratio (e.g. 1:2.35 or simply 2.35 — 1: bit can be left out)

Zoom settings currently experimental. If you find any bugs, please consider reporting the problem. See 'About ultrawidify' tab for details.

Manual zooming and panning

Zoom: 100%

show shortcuts reset

Pan with mouse

Video stretching options are currently experimental. If you find any bugs, please consider reporting the problem. See 'About ultrawidify' tab for details.

Stretching mode

Never
Basic
Hybrid
Thin borders

Video alignment:

left center right

Check every ms — Save

If zoomed in video doesn't align properly, try enabling or disabling certain CSS rules below:

Ultrawidify version:

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