diff --git a/README.md b/README.md
index acf2f06..504825c 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,15 @@ Swap language.
 `<C-q>`
 Clear all text in left window.
 
+`<C-y>`
+Copy selected text in left window.
+
+`<C-g>`
+Copy all text in left window.
+
+`<C-r>`
+Copy all text in right window.
+
 `<C-o>`
 Play sound on left window.
 
@@ -47,6 +56,12 @@ Cycle through the pop out widget.
 `<1>`, `<2>`, `<3>`
 Switch pop out window.
 
+## Dependencies
+
+`xclip` For Linux to copy text.
+
+`pbcopy` For macOS to copy text.
+
 ## Credit
 
 [snsd0805/GoogleTranslate-TUI](https://github.com/snsd0805/GoogleTranslate-TUI) For inspiration.
diff --git a/ui.go b/ui.go
index ebd33bf..7341af7 100644
--- a/ui.go
+++ b/ui.go
@@ -20,6 +20,12 @@ const (
 	Swap language.
 [#%[1]s]<C-q>[-]
 	Clear all text in left window.
+[#%[1]s]<C-y>[-]
+	Copy selected text in left window.
+[#%[1]s]<C-g>[-]
+	Copy all text in left window.
+[#%[1]s]<C-r>[-]
+	Copy all text in right window.
 [#%[1]s]<C-o>[-]
 	Play sound on left window.
 [#%[1]s]<C-p>[-]
@@ -370,6 +376,30 @@ func translatePageHandler(event *tcell.EventKey) *tcell.EventKey {
 		}
 	case tcell.KeyCtrlQ:
 		srcInput.SetText("", true)
+	case tcell.KeyCtrlY:
+		// copy selected text
+		text, _, _ := srcInput.GetSelection()
+
+		// only copy when text selected
+		if len(text) > 0 {
+			CopyToClipboard(text)
+		}
+	case tcell.KeyCtrlG:
+		// copy all text in Input
+		text := srcInput.GetText()
+
+		// only copy when text exist
+		if len(text) > 0 {
+			CopyToClipboard(text)
+		}
+	case tcell.KeyCtrlR:
+		// copy all text in Output
+		text := dstOutput.GetText(false)
+
+		// only copy when text exist
+		if len(text) > 0 {
+			CopyToClipboard(text[:len(text)-1])
+		}
 	case tcell.KeyCtrlS:
 		translator.SrcLang, translator.DstLang = translator.DstLang, translator.SrcLang
 		updateTitle()
diff --git a/utils.go b/utils.go
index 39b0a17..7a35826 100644
--- a/utils.go
+++ b/utils.go
@@ -1,5 +1,11 @@
 package main
 
+import (
+	"fmt"
+	"os/exec"
+	"runtime"
+)
+
 func IndexOf(candidate string, arr []string) int {
 	for index, element := range arr {
 		if element == candidate {
@@ -12,3 +18,16 @@ func IndexOf(candidate string, arr []string) int {
 func SetTermTitle(title string) {
 	print("\033]0;", title, "\007")
 }
+
+func CopyToClipboard(text string) {
+	switch runtime.GOOS {
+	case "linux":
+		exec.Command("sh", "-c",
+			fmt.Sprintf("echo -n '%s' | xclip -selection clipboard", text)).
+			Start()
+	case "darwin":
+		exec.Command("sh", "-c",
+			fmt.Sprintf("echo -n '%s' | pbcopy", text)).
+			Start()
+	}
+}