I am looking for a Chrome extension that can, with a keyboard shortcut, convert text to Sentence case and vice versa.

For example:


should be converted to

.This is a sample text


  • Keeps letter after . as a capital (for a sentence)
  • Keyboard shortcut
  • Works in website textboxes/textareas etc.
  • Works on Chrome in Windows 7 and OSX 10.6.8

NOTE: I am not looking for this to convert the text in the clipboard. I am looking for a solution that works with the selected text inside a textbox/textarea in a website.

  • Are you wanting that for text you copy out of browser or for text displayed in the browser? Commented Jul 4, 2014 at 16:18
  • 1
    Also it sounds to me that you want Sentence Case rather than strictly speaking lower case - not that it matters a lot but they are slightly different. Commented Jul 4, 2014 at 16:18
  • @NickWilde Ahhh... OK, I didn't know the term 'Sentence case' was actually real! Commented Jul 4, 2014 at 16:21
  • @NickWilde And, for text selected in the browser, that's it Commented Jul 4, 2014 at 16:40

2 Answers 2


A script to do it with AutoHotkey (scripting language for desktop automation on Windows), in case it's ok not to be browser only:

CTL+ALT+k - Sentence case (what you asked for)
CTL+L - convert to lowercase
CTL+U - convert to uppercase
CTL+K - invert the case (e.g. "The Big Dog" becomes "tHE bIG dOG")
SHIFT+CTL+K - convert to capitalized (e.g. "the big dog" becomes "The Big Dog")
SHIFT+CTL+U - convert to sentence case


!^k::                                           ; Sentence case
StringLower, Clipboard, Clipboard
Clipboard := RegExReplace(Clipboard, "((?:^|[.!?]\s+)[a-z])", "$u1")
Send %Clipboard%

^u::                                                                 ; Convert text to upper
 StringUpper Clipboard, Clipboard
 Send %Clipboard%

^l::                                                                 ; Convert text to lower
 StringLower Clipboard, Clipboard
 Send %Clipboard%

+^k::                                                                ; Convert text to capitalized
 StringUpper Clipboard, Clipboard, T
 Send %Clipboard%

^k::                                                                 ; Convert text to inverted
 Lab_Invert_Char_Out:= ""
 Loop % Strlen(Clipboard) {
    Lab_Invert_Char:= Substr(Clipboard, A_Index, 1)
    if Lab_Invert_Char is upper
       Lab_Invert_Char_Out:= Lab_Invert_Char_Out Chr(Asc(Lab_Invert_Char) + 32)
    else if Lab_Invert_Char is lower
       Lab_Invert_Char_Out:= Lab_Invert_Char_Out Chr(Asc(Lab_Invert_Char) - 32)
       Lab_Invert_Char_Out:= Lab_Invert_Char_Out Lab_Invert_Char
 Send %Lab_Invert_Char_Out%


  • dvfv dKMLM sdf. sdf SDFKLMSF sdf. -> Dvfv dkmlm sdf. Sdf sdfklmsf sdf.
  • Does this convert the clipboard text? I didn't mean that, sorry. I want to have a way to convert the text inside a textbox/textfield on a website... Commented Jul 4, 2014 at 16:46
  • @shub In this case adding a few more commands in the AHK script should do the trick. autohotkey.com/docs/commands/Send.htm Commented Jul 4, 2014 at 16:51

Building on Franck's AutoHotKey answer, mostly from here, is this script:

#d:: ConvertSentence()

    clipSave := Clipboard
    Clipboard = ; Empty the clipboard so that ClipWait has something to detect
    SendInput, ^c ;copies selected text
    StringReplace, Clipboard, Clipboard, `r`n, `n, All ;Fix for SendInput sending Windows linebreaks 
    StringLower, Clipboard, Clipboard ;Convert case
    Clipboard := RegExReplace(Clipboard, "(((^|([.!?]+\s+))[a-z])| i | i')", "$u1")
    Len:= Strlen(Clipboard) ;Set number of characters
    Send %Clipboard% ;Send new string
    Send +{left %Len%} ;Re-select text
    VarSetCapacity(OutputText, 0) ;free memory
    Clipboard := clipSave ;Restore previous clipboard

When you press Windows + D, the selected text will be converted to Sentence case.

Unfortunately AutoHotKey is only for Windows, so this won't work on Chrome on all platforms!

  • it works by copying the selected text, converting the copied text, pasting the converted text, and clearing the clipboard afterwards. Commented Jul 21, 2014 at 16:52

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