diff --git a/golden-files/results/pdf2txt-standard_pdf b/golden-files/results/pdf2txt-standard_pdf
index be97bed..cbc5f8c 100644
--- a/golden-files/results/pdf2txt-standard_pdf
+++ b/golden-files/results/pdf2txt-standard_pdf
@@ -1,3 +1,3 @@
 Cover Page
           
-          
\ No newline at end of file
+#         
\ No newline at end of file
diff --git a/golden-files/results/perl6_syntax-perl6_p6 b/golden-files/results/perl6_syntax-perl6_p6
index 032e5f9..a8583b5 100644
--- a/golden-files/results/perl6_syntax-perl6_p6
+++ b/golden-files/results/perl6_syntax-perl6_p6
@@ -1,7 +1,7 @@
-===SORRY!===                                                                 
+#[31m===#[0mSORRY!#[31m===#[0m                                                                 
 Two terms in a row across lines (missing semicolon or comma?)                                  
 at /tmp/vigil/golden-files/./input/perl6.p6:30                                                 
-------> say 'Hello from Perl 6!'⏏<EOL>                                      
+------> #[32msay 'Hello from Perl 6!'#[33m⏏#[31m<EOL>#[0m                                      
     expecting any of:                                                                          
         infix                                                                                  
         infix stopper                                                                          
@@ -12,5 +12,5 @@ at /tmp/vigil/golden-files/./input/perl6.p6:30
 Other potential difficulties:                                                                  
     Useless declaration of a has-scoped method in mainline (did you mean 'my regex http-verb'?)
     at /tmp/vigil/golden-files/./input/perl6.p6:11                                             
-    ------> regex ⏏http-verb {                                              
+    ------> #[32mregex #[33m⏏#[31mhttp-verb {#[0m                                              
                                                                                                
\ No newline at end of file
diff --git a/golden-files/results/perl_syntax-perl6_pl b/golden-files/results/perl_syntax-perl6_pl
index faa0933..0a1bb85 100644
--- a/golden-files/results/perl_syntax-perl6_pl
+++ b/golden-files/results/perl_syntax-perl6_pl
@@ -1,7 +1,7 @@
-===SORRY!===                                                                 
+#[31m===#[0mSORRY!#[31m===#[0m                                                                 
 Two terms in a row across lines (missing semicolon or comma?)                                  
 at /tmp/vigil/golden-files/./input/perl6.pl:30                                                 
-------> say 'Hello from Perl 6!'⏏<EOL>                                      
+------> #[32msay 'Hello from Perl 6!'#[33m⏏#[31m<EOL>#[0m                                      
     expecting any of:                                                                          
         infix                                                                                  
         infix stopper                                                                          
@@ -12,5 +12,5 @@ at /tmp/vigil/golden-files/./input/perl6.pl:30
 Other potential difficulties:                                                                  
     Useless declaration of a has-scoped method in mainline (did you mean 'my regex http-verb'?)
     at /tmp/vigil/golden-files/./input/perl6.pl:11                                             
-    ------> regex ⏏http-verb {                                              
+    ------> #[32mregex #[33m⏏#[31mhttp-verb {#[0m                                              
                                                                                                
\ No newline at end of file
diff --git a/tools.py b/tools.py
index 84cb6ea..0a482fc 100644
--- a/tools.py
+++ b/tools.py
@@ -18,6 +18,7 @@ import os.path
 import pickle
 import pwd
 import stat
+import string
 import subprocess
 import tempfile
 import time
@@ -84,9 +85,14 @@ _LS_COLOR_CODES = get_ls_color_codes()
 TIMEOUT = 60
 
 
+def _printable(text):
+    return "".join(char if ord(char) > 31 or char in ["\n", "\t"] else "#"
+                   for char in text)
+
+
 def _fix_input(input_):
     input_str = input_.decode("utf-8") if isinstance(input_, bytes) else input_
-    return input_str.expandtabs(tabsize=4)
+    return _printable(input_str).expandtabs(tabsize=4)
 
 
 def _do_command(command, timeout=None, **kwargs):
@@ -248,7 +254,7 @@ def contents(path):
     root, ext = splitext(path)
     if ext == "":
         with open(path) as file_:
-            return Status.normal, fill3.Text(file_.read())
+            return Status.normal, fill3.Text(_fix_input(file_.read()))
     else:
         return pygments_(path)
 contents.dependencies = {"python3-pygments"}