Which keys are free / unmapped by default in VIM?

Question

Is there a list of keys which aren't mapped by default in vim? / gvim?

Answer 1

Free Keys

Normal Mode

• <C-K>
• <C-_> (Same as <C-/>)
• <C-[> (Same as <Esc>)
• <C-@> (Same as <C-Space>)

Visual Mode

• <C-T>
• <C-K>
• <C-@> (Same as <C-Space>)
• <C-O>
• Q
• Z
• .
• <C-R>
• <C-_> (Same as <C-/>)
• <C-^>
• &
• <C-I> (This is the <Tab> key)

Insert Mode

• <C-_> (Same as <C-/>)
• <C-Z> (Unless insertmode is set)
• <C-B

Command-line Mode

• <C-@> (Same as <C-Space>)
• <C-O>
• <C-Z>
• <C-_> (Only active in default vim if allowrevins is set, for right-to-left languages)
• <C-X>

All Modes

• All function keys
• All ALT key combinations
• <C-S>

---

Used source: https://vim.fandom.com/wiki/Unused_keys

This link points to a page listing unused keys in vim.

This page also lists keys that are synonyms of other keys in terms of functionality, meaning that these keys can be safely remapped.

Answer 2

This list shows the unbound keys in standard vi; unbound keys extracted from the complete list of all the bound keys in the link:

g   UNBOUND
q   UNBOUND
v   UNBOUND
K   UNBOUND
V   UNBOUND
#   UNBOUND
*   UNBOUND
\   UNBOUND
=   UNBOUND
^A  UNBOUND
^C  UNBOUND
^I  (TAB) UNBOUND
^K  UNBOUND
^O  UNBOUND
^V  UNBOUND
^W  UNBOUND
^X  UNBOUND
^[  (ESC) cancel started command; otherwise UNBOUND
^_  UNBOUND
^?  (DELETE) UNBOUND