diff --git a/gists.org b/gists.org
index 3723c59..073c8fe 100644
--- a/gists.org
+++ b/gists.org
@@ -496,6 +496,37 @@ It turns out it didn't work as well as I hoped, paredit steals the RET binding s
   (advice-add #'tempel-insert :around #'my/store-region)
 #+end_src
 
+* dwim-shell-command to encrypt files with age :emacs:age:
+
+#+begin_src elisp :tangle gists/dwim-shell-command-encrypt-with-age.el
+  (defconst my/cygwin-p (string-equal system-type "cygwin"))
+  (defconst my/age-pubkey "ageXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
+
+  (defun my/dwim-shell-command/convert-path-cygwin (template unix-path)
+    "Convert a Unix path to a Windows path.
+
+  This can be used as a :post-process-template of a
+  dwim-shell-command-on-marked-files function, where <<f>>
+  templates expand to Unix-like paths. However, a non-Cygwin binary
+  does not understand Unix paths so use cygpath to convert it."
+    (if my/cygwin-p
+        (let* ((command (format "cygpath -w %s" unix-path))
+               (cygwin-path (string-trim (shell-command-to-string command)))
+               (escaped-cygwin-path (string-replace "\\" "\\\\" cygwin-path)))
+          (string-replace unix-path escaped-cygwin-path template))
+
+      ;; just return the template as-is
+      template))
+
+  (defun my/dwim-shell-command/age-encrypt ()
+    "Encrypt marked files with the age encryption tool."
+    (interactive)
+    (dwim-shell-command-on-marked-files "Age Encypt"
+                                        (format "age -e -r %s -o <<f>>.age <<f>>" my/age-pubkey)
+                                        :utils "age"
+                                        :post-process-template #'my/dwim-shell-command/convert-path-cygwin))
+#+end_src
+
 * Meta
 ** License
 
diff --git a/gists/dwim-shell-command-encrypt-with-age.el b/gists/dwim-shell-command-encrypt-with-age.el
new file mode 100644
index 0000000..b15cb8b
--- /dev/null
+++ b/gists/dwim-shell-command-encrypt-with-age.el
@@ -0,0 +1,26 @@
+(defconst my/cygwin-p (string-equal system-type "cygwin"))
+(defconst my/age-pubkey "ageXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
+
+(defun my/dwim-shell-command/convert-path-cygwin (template unix-path)
+  "Convert a Unix path to a Windows path.
+
+This can be used as a :post-process-template of a
+dwim-shell-command-on-marked-files function, where <<f>>
+templates expand to Unix-like paths. However, a non-Cygwin binary
+does not understand Unix paths so use cygpath to convert it."
+  (if my/cygwin-p
+      (let* ((command (format "cygpath -w %s" unix-path))
+             (cygwin-path (string-trim (shell-command-to-string command)))
+             (escaped-cygwin-path (string-replace "\\" "\\\\" cygwin-path)))
+        (string-replace unix-path escaped-cygwin-path template))
+
+    ;; just return the template as-is
+    template))
+
+(defun my/dwim-shell-command/age-encrypt ()
+  "Encrypt marked files with the age encryption tool."
+  (interactive)
+  (dwim-shell-command-on-marked-files "Age Encypt"
+                                      (format "age -e -r %s -o <<f>>.age <<f>>" my/age-pubkey)
+                                      :utils "age"
+                                      :post-process-template #'my/dwim-shell-command/convert-path-cygwin))