diff --git a/libimaglink/Cargo.toml b/libimaglink/Cargo.toml
index 22d20f61..54c3b15a 100644
--- a/libimaglink/Cargo.toml
+++ b/libimaglink/Cargo.toml
@@ -6,6 +6,7 @@ authors = ["Matthias Beyer <mail@beyermatthias.de>"]
 [dependencies]
 log = "0.3.4"
 toml = "0.1.27"
+url = "0.5.5"
 
 [dependencies.libimagstore]
 path = "../libimagstore"
diff --git a/libimaglink/src/external.rs b/libimaglink/src/external.rs
index b9168b20..59d6c0e1 100644
--- a/libimaglink/src/external.rs
+++ b/libimaglink/src/external.rs
@@ -8,6 +8,7 @@ use result::Result;
 
 use toml::Value;
 use toml::Table;
+use url::Url;
 
 #[derive(PartialOrd, Ord, Eq, PartialEq, Clone, Debug)]
 pub struct Link {
@@ -20,6 +21,10 @@ impl Link {
         Link { link: s }
     }
 
+    pub fn is_valid(&self) -> bool {
+        Url::parse(&self.link[..]).is_ok()
+    }
+
 }
 
 #[derive(Eq, PartialEq, Clone, Debug)]
@@ -41,6 +46,10 @@ impl Links {
         self.links.retain(|link| l != link.clone());
     }
 
+    pub fn all_valid(&self) -> bool {
+        self.links.iter().all(|l| l.is_valid())
+    }
+
 }
 
 impl Into<String> for Link {
diff --git a/libimaglink/src/lib.rs b/libimaglink/src/lib.rs
index 0ea1f956..abb3a7ab 100644
--- a/libimaglink/src/lib.rs
+++ b/libimaglink/src/lib.rs
@@ -1,5 +1,6 @@
 #[macro_use] extern crate log;
 extern crate toml;
+extern crate url;
 
 extern crate libimagstore;