diff --git a/tools/make_favicon.php b/tools/make_favicon.php
deleted file mode 100644
index 8f59ac9..0000000
--- a/tools/make_favicon.php
+++ /dev/null
@@ -1,60 +0,0 @@
-<?php
-
-const W = 10;
-const H = 10;
-
-$img = imagecreatetruecolor(W, H);
-imagealphablending($img, false);
-imagesavealpha($img, true);
-
-// Allocate a transparent color and fill the image with it
-$transparent = imagecolorallocatealpha($img, 0, 0, 0, 127);
-imagefill($img, 0, 0, $transparent);
-
-
-$x = 0;
-$y = 0;
-
-$plaintext = 'knowledge  is  power';
-$alphabet = 'ABCDEFGHIKLMNOPQRSTVWXYZ';
-
-function move_cursor(): void {
-    global $x, $y;
-    if ($x >= W-1) {
-        $x = 0;
-        $y++;
-    } else {
-        $x++;
-    }
-}
-
-function encode(string $letter): array {
-    global $alphabet;
-    $letter = strtoupper($letter);
-    $n = strpos($alphabet, $letter);
-    if ($n === false)
-        throw new Exception("letter $letter not found in the alphabet");
-    $ab = [];
-    for ($i = 0; $i < 5; $i++)
-        $ab[] = ($n >> $i) & 0x01;
-    return array_reverse($ab);
-}
-
-$a = imagecolorallocate($img, 0xcc, 0xcc, 0xcc);
-$b = imagecolorallocate($img, 0x99, 0x99, 0x99);
-
-for ($i = 0; $i < strlen($plaintext); $i++) {
-    $c = $plaintext[$i];
-    if ($c == ' ') {
-        for ($j = 0; $j < 5; $j++)
-            move_cursor();
-        continue;
-    }
-
-    foreach (encode($c) as $bit) {
-        imagesetpixel($img, $x, $y, $bit ? $b : $a);
-        move_cursor();
-    }
-}
-
-imagepng($img, '/tmp/4in1_fav.png');
\ No newline at end of file