Refresh page. Sometimes GMail seems to get stuck on certain pages won't allow shortcuts. Things tend to work fine after a page refresh.

`Command` + `R`

All hotkeys for Google Mail (MacOS)

Navigate Main Gmail Window Go to Inbox	`G` , then `I`
Navigate Main Gmail Window Go to starred conversations	`G` , then `S`
Navigate Main Gmail Window Go to sent mail	`G` , then `T`
Navigate Main Gmail Window Go to Drafts	`G` , then `D`
Navigate Main Gmail Window Go to all mail	`G` , then `A`
Navigate Main Gmail Window Go to Contacts	`G` , then `C`
Navigate Main Gmail Window Go to Label. Use arrow keys from here	`G` , then `L`
Navigate Main Gmail Window Generally resets state. Often necessary before using a Keyboard Shortcut to move out of the current task or field. Sometimes reloading page helps via Command+R.	`Esc`
Navigate Main Gmail Window Undo previous action	`Z`
Main Window - Manage Message List Move to next (older) / move to previous (newer) e-mail or conversation	`J` / `K`
Main Window - Manage Message List Select or unselect current conversation	`X`
Main Window - Manage Message List Select all conversations / Un select all conversations	`` , then `A` / `` , then `N`
Main Window - Manage Message List Select all read conversations / Select all unread conversations	`` , then `R` / `` , then `U`
Main Window - Manage Message List Select all starred conversations / Select all unstarred conversations	`` , then `S` / `` , then `T`
Main Window - Manage Message List Mark selected messages as unread / Mark selected messages as read	`Shift` + `U` / `Shift` + `I`
Main Window - Manage Message List Open message	`O` or `Enter`
Main Window - Manage Message List Delete selected message	`#`
Main Window - Manage Message List Mov selected message. Use Arrow Keys and Enter to proceed	`V`
Main Window - Manage Message List Add Label to message, opens label menu. Use Arrow Keys and enter to proceed	`L`
Main Window - Manage Message List Archive selected messages	`E`
Main Window - Manage Message List Mark selected messages as spam	`!`
Main Window - Manage Message List Mute selected message. Archives the conversation and all future messages	`M`
Main Window - Manage Message List Star or unstar message	`S`
Main Window - Manage Message List Remove from current view: To archive while in Inbox, to Inbox while in Trash, remove star while in Starred Conversation, remove Label while in Labels.	`Y`
Main Window - Manage Single Messages Move to next (older) / move to previous (newer) e-mail or conversation	`J` / `K`
Main Window - Manage Single Messages Move to next part / previous part of conversation in message	`N` / `P`
Main Window - Manage Single Messages Reply to sender	`R`
Main Window - Manage Single Messages Reply to sender in new window	`Shift` + `R`
Main Window - Manage Single Messages Reply to all	`A`
Main Window - Manage Single Messages Reply to all in new window	`Shift` + `A`
Main Window - Manage Single Messages Forward message	`F`
Main Window - Manage Single Messages Forward message in new window	`Shift` + `F`
Main Window - Manage Single Messages Save Message. Cursor should be in field	`Command` + `S`
Main Window - Manage Single Messages Remove from current view and move to older / move to newer message (won't delete message, just changes view)	`Command` + `[` / `Command` + `]`
Main Window - Manage Single Messages Archive and move to older message / move to newer message	`Command` + `{` / `Command` + `}`
Main Window - Manage Single Messages Return to inbox or conversation list	`U`
Main Window - Manage Single Messages Delete selected message and jump back to the message list	`#`
Main Window - Manage Single Messages Move selected message	`V`
Main Window - Manage Single Messages Add label to message, opens label menu and jump back to the message list	`L`
Main Window - Manage Single Messages Archive selected messages and jump back to the message list	`E` / `[`
Main Window - Manage Single Messages Mark selected messages as spam and jump back to the message list	`!`
Main Window - Manage Single Messages Mute selected message and jump back to the message list	`M`
Main Window - Manage Single Messages Star or unstar message	`S`
Main Window - Manage Single Messages Remove from current view and jump back to the message list	`Y`
Compose Messages Compose a new message (Press Escape to cancel)	`C`
Compose Messages Send Message	`Command` + `Enter`
Compose Messages Move cursor to next / move cursor to previous chat or compose window (or to main window)	`Command` + `.` / `Command` + `,`
Compose Messages Add Cc recipient	`Command` + `Shift` + `C`
Compose Messages Add Bcc recipient	`Command` + `Shift` + `B`
Compose Messages Change From address	`Command` + `Shift` + `F`
Format Text in Messages Increase / decrease the font size of all or some text	`Command` + `Shift` + `+` / `-`
Format Text in Messages Change font to the previous font / to the next font as listed in the menu	`Command` + `Shift` + `5` / `6`
Format Text in Messages Bold formatting	`Command` + `B`
Format Text in Messages Italic formatting	`Command` + `I`
Format Text in Messages Uunderline formatting	`Command` + `U`
Format Text in Messages Create Numbered List	`Command` + `Shift` + `7`
Format Text in Messages Create Bulleted List	`Command` + `Shift` + `8`
Format Text in Messages Left align	`Command` + `Shift` + `L`
Format Text in Messages Center align	`Command` + `Shift` + `E`
Format Text in Messages Right align	`Command` + `Shift` + `R`
Format Text in Messages Increase indent/ decrease indent	`Command` + `]` / `[`
Format Text in Messages Format text block to Quote	`Command` + `Shift` + `9`
Format Text in Messages Change text directionality to Right-to-Left	`Command` + `Shift` + `.`
Format Text in Messages Change text directionality to Left-to-Right	`Command` + `Shift` + `,`
Format Text in Messages Insert hyperlink	`Command` + `K`
Tasks in Gmail Go to task window or opens task window (see limitations above)	`G` , then `K`
Tasks in Gmail Add message(s) to Tasks	`Shift` + `T`
Tasks in Gmail Move cursor up and down in task list	`Arrow Keys`
Tasks in Gmail Move current task up and down in task list	`Command` + `Up Arrow` / `Command` + `Down Arrow`
Tasks in Gmail Increase / Decrease Indent	`Tab` / `Shift` + `Tab`
Tasks in Gmail Edit task details, including due date or notes.	`Shift` + `Enter`
Tasks in Gmail Shift the cursor from tasks to Gmail, but only one-way	`Shift` + `Esc`
Tasks in Gmail Closes Task Window if focus is on it (see limitations above)	`Esc`
Control Main Browser Window (General Browser Shortcuts) One page back / one page forward	`Alt` + `Arrow Left` / `Alt` + `Arrow Right`
Control Main Browser Window (General Browser Shortcuts) Jump to beginning of page / end of page	`End` / `Home`
Control Main Browser Window (General Browser Shortcuts) Jump one page up / one page down	`Page Up` / `Page Down`
Control Main Browser Window (General Browser Shortcuts) Move the focus of the browser to the main window. Jumps to the address bar first, then through toolbars until landing at the main window.	`Alt` + `d` , then multiple `tab` 's
Control Main Browser Window (General Browser Shortcuts) Jump forward / jump backwards between input fields	`Tab` / `Shift` + `Tab`
Control Main Browser Window (General Browser Shortcuts) Refresh page. Sometimes GMail seems to get stuck on certain pages won't allow shortcuts. Things tend to work fine after a page refresh.	`Command` + `R`