diff --git a/README.md b/README.md
index 61001f9..1dc8e96 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,27 @@
 # pixelfed-imgproxy-apache2
 
-Media proxy project for pixelfed. This project makes images, videos from remote pixelfed instances URLs proxied through the homeserver.
\ No newline at end of file
+Media proxy project for pixelfed. This project makes images, 
+videos from remote pixelfed instances URLs proxied through the homeserver.
+
+
+## Installation (standalone)
+
+Copy the code to your pixelfed installation
+```bash
+cp -a imgproxy /var/www/public/imgproxy
+```
+
+Add the following lines in your apache Virtualhost configuration 
+(replace pixel.nogafam.es to your instance URL)
+```apache2
+AddOutputFilterByType SUBSTITUTE application/json
+Substitute "s@(?<=\")https:\\\/\\\/[^\"]+\.(png|jpg|jpeg)@https:\\\/\\\/pixel.nogafam.es\\\/imgproxy\\\/?url=$0@i"
+Substitute "s@(?<=\")https://[^\"]+\.(png|jpg|jpeg)@https://pixel.nogafam.es/imgproxy/?url=$0@i"
+```
+
+Enable `mod_substitute` on Apache
+```bash
+a2enmod substitute
+```
+
+
diff --git a/imgproxy/index.php b/imgproxy/index.php
new file mode 100644
index 0000000..cd02d64
--- /dev/null
+++ b/imgproxy/index.php
@@ -0,0 +1,14 @@
+<?php
+
+$url = trim($_GET['url']);
+
+# check url matches a https://domain/storage/whatever.jpeg url for images
+if (preg_match('/^https:\/\/[^\/]+\/storage\/[^\s\%]+\.(png|jpg|jpeg)(\?v=[^\&])?$/', $url)) {
+	if (preg_match('/^.*\.png(\?v=[^\&])?$/', $url))
+		header('Content-Type: image/png');
+	else if (preg_match('/^.*\.(jpg|jpeg)(\?v=[^\&])?$/', $url))
+		header('Content-Type: image/jpeg');
+	echo file_get_contents($url);
+}
+
+?>