diff --git a/src/main.rs b/src/main.rs
index e08daec..99a4b11 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -19,7 +19,7 @@ use bytesize::ByteSize;
 use log::{error, warn};
 use password_hash::PasswordHashString;
 use serde::{Deserialize, Serialize};
-use state::StateDb;
+use state::{StateDb, prelude::SizedFile};
 use store::{StoredFile, StoredFiles};
 use tokio::fs::File;
 
diff --git a/src/state.rs b/src/state.rs
index b7e6635..352971a 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -1,6 +1,6 @@
 use jsondb::JsonDb;
 
-mod prelude {
+pub mod prelude {
     pub use std::collections::HashMap;
 
     pub use jsondb::Schema;
@@ -8,8 +8,17 @@ mod prelude {
     pub use serde_with::serde_as;
     pub use serde_with::skip_serializing_none;
     pub use time::OffsetDateTime;
+
+    pub trait SizedFile {
+        fn size(&self) -> u64;
+
+        fn formatted_size(&self) -> String {
+            bytesize::to_string(self.size(), false).replace(" ", "")
+        }
+    }
 }
 
+
 mod v0;
 
 pub mod v1 {
@@ -42,6 +51,9 @@ pub mod v1 {
             }
         }
     }
+    impl SizedFile for UploadedFile {
+        fn size(&self) -> u64 { self.size }
+    }
 
     #[derive(Debug, Clone, Deserialize, Serialize)]
     pub struct FileSet {
@@ -70,6 +82,9 @@ pub mod v1 {
         pub expiry: OffsetDateTime,
         pub contents: Option<FileSet>,
     }
+    impl SizedFile for StoredFile {
+        fn size(&self) -> u64 { self.size }
+    }
 
     #[derive(Debug, Clone, Deserialize, Serialize)]
     pub struct StoredFileWithPassword {
diff --git a/templates/download.html b/templates/download.html
index 1c6e13c..91fbc48 100644
--- a/templates/download.html
+++ b/templates/download.html
@@ -4,7 +4,7 @@
 
 {% block og_title %}{{ info.file.name }}{% endblock %}
 {% block og_description -%}
-  {% let formatted_total_size = bytesize::to_string(info.file.size.clone(), false).replace(" ", "") -%}
+  {% let formatted_total_size = info.file.formatted_size() -%}
   {% match info.file.contents -%}
     {% when Some with (files) -%}
       {{ files.files.len() }} files, {{ formatted_total_size }} total
@@ -26,7 +26,7 @@
 {% block body %}
   <div id="download_toplevel" class="section">
     <div class="file_name">{{ info.file.name }}</div>
-    <div class="file_size">{{ bytesize::to_string(info.file.size.clone(), false).replace(" ", "") }}</div>
+    <div class="file_size">{{ info.file.formatted_size() }}</div>
     <div class="file_download"><a class="download_button" href="download?code={{ info.code }}&download=all"></a></div>
     <div class="file_expiry">Expires {{ info.file.expiry.format(DATE_DISPLAY_FORMAT).unwrap() }}</div>
   </div>
@@ -39,7 +39,7 @@
             {% let offsets = info.offsets.as_ref().unwrap() %}
             {% for f in files.files %}
               <tr class="{% if offsets.get(loop.index0.clone()).unwrap().clone() > info.available %}unavailable{% endif %}">
-                <td class="file_size">{{ bytesize::to_string(f.size.clone(), false).replace(" ", "") }}</td>
+                <td class="file_size">{{ f.formatted_size() }}</td>
                 <td class="file_name">{{ f.name }}</td>
                 <td class="file_download"><a class="download_button" href="download?code={{ info.code }}&download={{ loop.index0 }}"></a></td>
                 <td class="file_unavailable"></td>