Answer

NoaLingua keyboard shortcuts, and how to change them

Thirteen rebindable keys, the ones YouTube will not give up, and a Language Reactor layout

Thirteen single keys control the player — R repeat, P previous, N next, A auto-pause, S save the sentence, X slow replay, V reveal, Y say it back, H shadow the line, B bookmark, Z focus, D display, E speak. All are rebindable, and a Language Reactor layout preset is included.

Short answer Thirteen rebindable single keys, plus a Language Reactor layout preset for fingers that already know one.

Step by step

Doing it with NoaLingua

1

See the whole map in place

Quick menu → Keyboard shortcuts, inside the player. It is split into the keys that cannot change and the keys that can, with the layout preset above and Reset to defaults below.
2

Press Edit on the row you want to move

The row reads "Press a key…". Press the key you want; Escape cancels. While the Edit button has focus, a keypress is a binding rather than an action, so rebinding N does not also skip a sentence.
3

Or switch the whole layout at once

The preset selector offers the NoaLingua default — mnemonic: r repeat, p previous, n next, s save — and a Language Reactor layout, where s is replay, a and d switch lines and q is auto-pause. Custom is not a preset but a state: it appears as soon as you change anything.

Add to Chrome — Free Add to Chrome Opens the Chrome Web Store listing NoaLingua — beyond dual subs: video, web, PDF — free, no account, Chrome 138 or newer.

Why some keys are refused, and why it says so

Space, k, j, l, f, m, c, i, t, the arrows and the digits are YouTube's own. Binding one of them would fire both actions at once, which does not read as a conflict — it reads as a broken page. So the attempt is refused with the reason: "X is YouTube's own shortcut."

Two other refusals exist for the same reason. A key already bound to something says which action has it. A bare modifier says "Pick a letter or number key", because Shift on its own binds nothing useful.

The keys that cannot be rebound, and where they work

Ctrl+H starts whole-video shadowing on YouTube. Alt+L turns NoaLingua on or off for whatever site you are on — anywhere, including a tab that was open before the extension was installed or updated. Alt+Shift+W highlights every word on the page you have never met. Alt+click translates one paragraph in place. Escape closes a card or a selection box.

These are fixed because each is either a modifier combination, a Chrome-level command, or belongs to a surface rather than to the player. The single-key table maps single keys; the rest are a different mechanism.

What happens if the binding table gets damaged

If the stored table is corrupt, missing or clashing keys are restored to their defaults individually rather than the whole table being reset. One broken row must not leave somebody with no shortcuts at all.

Every button under the subtitle box does the same job as its key, and its tooltip shows your current binding — including when you have changed it. The buttons exist so the keys are discoverable rather than as an alternative to them.

Where this is documented on NoaLingua

Try it on the next thing you were going to watch anyway.

Free, with every feature. No account, nothing to cancel, and your deck stays on your machine.

Add to Chrome — Free Add to Chrome Opens the Chrome Web Store listing NoaLingua — beyond dual subs: video, web, PDF — free, no account, Chrome 138 or newer.

What happens after you install Pricing What it cannot do

Doing it with NoaLingua

See the whole map in place

Press Edit on the row you want to move

Or switch the whole layout at once

The detail behind the NoaLingua answer

Why some keys are refused, and why it says so

The keys that cannot be rebound, and where they work

What happens if the binding table gets damaged

More questions people ask NoaLingua

Where this is documented on NoaLingua

Related NoaLingua answers

Try it on the next thing you were going to watch anyway.