diff --git a/test/urlencode.c b/test/urlencode.c
new file mode 100644
index 0000000..51df16e
--- /dev/null
+++ b/test/urlencode.c
@@ -0,0 +1,17 @@
+#include <string.h>
+#include "buffer.h"
+#include "textcode.h"
+
+void urlencode(const char* c) {
+  char* buf=alloca(strlen(c)*3+1);
+  buffer_put(buffer_1,buf,fmt_urlencoded(buf,c,strlen(c)));
+  buffer_putnlflush(buffer_1);
+}
+
+main(int argc,char* argv[]) {
+  int i;
+  for (i=1; i<argc; ++i) {
+    urlencode(argv[i]);
+  }
+  return 0;
+}