Set a message as your oldest unread message

`Alt` + `Mouse left click`

All hotkeys for Slack

Quick list of shortcuts View all Slack keyboard shortcuts	`Ctrl` + `/`
Message autocomplete Autocomplete emoji. Example: :emoji	`⭾ Tab`
Navigation Move Move focus to previous element	`↑ Shift` + `⭾ Tab`
Navigation Move focus through messages in a channel or DM	`↑ ↓`
Navigation Move focus to the next section	`Ctrl` + `
Navigation Move focus to the previous section	`↑ Shift` + `Ctrl` + `
Navigation Take action or "click" on buttons	`Space`
Navigation Take action or "click" on links	`⤶ Enter`
Mark messages read or unread Mark all messages in current channel or DM as read	`Esc`
Navigation Zoom in	`Ctrl` + `+`
Navigation Zoom out	`Ctrl` + `-`
Navigation Scroll up	`Home`
Navigation Scroll up	`Page Up`
Navigation Scroll down	`End`
Navigation Scroll down	`Page Down`
Navigation Quick switcher	`Ctrl` + `K`
Navigation Quick switcher (only in desktop app)	`Ctrl` + `T`
Navigation Direct messages menu	`Ctrl` + `↑ Shift` + `K`
Navigation Open all threads view	`Ctrl` + `↑ Shift` + `T`
Navigation Previous channel or DM	`Alt` + `↑`
Navigation Next channel or DM	`Alt` + `↓`
Navigation Previous unread channel or DM	`Alt` + `↑ Shift` + `↑`
Navigation Previous channel or DM visited	`Alt` + `←`
Navigation Next channel or DM visited	`Alt` + `→`
Navigation Preferences	`Ctrl` + `,`
Navigation Open or close right pane	`Ctrl` + `.`
Navigation Channel info page	`Ctrl` + `↑ Shift` + `I`
Navigation Activity	`Ctrl` + `↑ Shift` + `M`
Navigation Directory	`Ctrl` + `↑ Shift` + `E`
Navigation Starred items	`Ctrl` + `↑ Shift` + `S`
Navigation Search the current channel or conversation	`Ctrl` + `F`
Navigation Toggle full screen view	`Ctrl` + `↑ Shift` + `F`
All unreads navigation Open all unreads view	`Ctrl` + `↑ Shift` + `A`
Mark messages read or unread Set a message as your oldest unread message	`Alt` + `Mouse left click`
All unreads navigation Move between channels	`← →`
All unreads navigation Toggle current channel read or unread	`R`
Switch teams Switch to previous team	`Ctrl` + `↑ Shift` + `⭾ Tab`
Switch teams Switch to next team	`Ctrl` + `⭾ Tab`
Switch teams (...to <keybs>9</keybs>) Switch to a specific team (you can see assigned number under the team icon in your Slack app)	`Ctrl` + `1`
Mark messages read or unread Mark all messages as read	`↑ Shift` + `Esc`
Message shortcuts (in empty message box) Edit your last message	`↑`
Message shortcuts Select text to the beginning of current line	`↑ Shift` + `↑`
Message shortcuts Select text to the end of current line	`↑ Shift` + `↓`
Message shortcuts Create a new line in your message	`↑ Shift` + `⤶ Enter`
Message shortcuts Add emoji reactions to a message	`Ctrl` + `↑ Shift` + `\`
Files and snippets Upload a file	`Ctrl` + `U`
Files and snippets Create a new snippet	`Ctrl` + `↑ Shift` + `⤶ Enter`
Call actions Toggle mute on and off	`M`
Call actions Toggle video on and off	`V`
Call actions Show invite list	`+`
Call actions Show invite list	`A`
Call actions (...to <keybs>9</keybs>) View and select and emoji reactions	`E` + `1`
Call actions Sharing options	`S`