diff --git a/functions.lua b/functions.lua
index 576caed..ead2197 100644
--- a/functions.lua
+++ b/functions.lua
@@ -85,39 +85,6 @@ function fediauth.generate_tfediauth(secret_b32, unix_time)
     return padded_code, valid_seconds
 end
 
-function fediauth.create_qr_png(data)
-    local height = #data + 2
-    local width = height
-
-    local png_data = {}
-    -- top padding
-    for _=1,width do
-        table.insert(png_data, 0xFFFFFFFF)
-    end
-
-    for _, row in ipairs(data) do
-        -- left padding
-        table.insert(png_data, 0xFFFFFFFF)
-        for _, v in ipairs(row) do
-            if v > 0 then
-                table.insert(png_data, 0xFF000000)
-            else
-                table.insert(png_data, 0xFFFFFFFF)
-            end
-        end
-        -- right padding
-        table.insert(png_data, 0xFFFFFFFF)
-    end
-
-    -- bottom padding
-    for _=1,width do
-        table.insert(png_data, 0xFFFFFFFF)
-    end
-
-    assert(#png_data == width*height)
-    return minetest.encode_png(width, height, png_data, 2)
-end
-
 function fediauth.generate_secret()
     local buf = minetest.sha1("" .. math.random(10000), true)
     local s = buf:sub(1, 20)