diff --git a/Cargo.lock b/Cargo.lock
index ffdd71b..ff1f3dd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -292,6 +292,7 @@ dependencies = [
  "num_cpus",
  "regex",
  "rustls-native-certs",
+ "sanitize-filename",
  "signal-hook",
  "sys-locale",
  "tempfile",
@@ -1361,6 +1362,16 @@ version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4501abdff3ae82a1c1b477a17252eb69cee9e66eb915c1abaa4f44d873df9f09"
 
+[[package]]
+name = "sanitize-filename"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08c502bdb638f1396509467cb0580ef3b29aa2a45c5d43e5d84928241280296c"
+dependencies = [
+ "lazy_static",
+ "regex",
+]
+
 [[package]]
 name = "schannel"
 version = "0.1.20"
diff --git a/crunchy-cli-core/Cargo.lock b/crunchy-cli-core/Cargo.lock
index 4fa983a..b842f38 100644
--- a/crunchy-cli-core/Cargo.lock
+++ b/crunchy-cli-core/Cargo.lock
@@ -260,6 +260,7 @@ dependencies = [
  "num_cpus",
  "regex",
  "rustls-native-certs",
+ "sanitize-filename",
  "signal-hook",
  "sys-locale",
  "tempfile",
@@ -1323,6 +1324,16 @@ version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4501abdff3ae82a1c1b477a17252eb69cee9e66eb915c1abaa4f44d873df9f09"
 
+[[package]]
+name = "sanitize-filename"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08c502bdb638f1396509467cb0580ef3b29aa2a45c5d43e5d84928241280296c"
+dependencies = [
+ "lazy_static",
+ "regex",
+]
+
 [[package]]
 name = "schannel"
 version = "0.1.20"
diff --git a/crunchy-cli-core/Cargo.toml b/crunchy-cli-core/Cargo.toml
index 30e6d44..d797098 100644
--- a/crunchy-cli-core/Cargo.toml
+++ b/crunchy-cli-core/Cargo.toml
@@ -20,6 +20,7 @@ isahc = { git = "https://github.com/sagebind/isahc", rev = "c39f6f8" }
 log = { version = "0.4", features = ["std"] }
 num_cpus = "1.13"
 regex = "1.6"
+sanitize-filename = "0.4"
 signal-hook = "0.3"
 tempfile = "3.3"
 terminal_size = "0.2"
diff --git a/crunchy-cli-core/src/cli/archive.rs b/crunchy-cli-core/src/cli/archive.rs
index a057aed..e798e75 100644
--- a/crunchy-cli-core/src/cli/archive.rs
+++ b/crunchy-cli-core/src/cli/archive.rs
@@ -206,8 +206,7 @@ impl Execute for Archive {
                         .to_string(),
                         primary,
                     )),
-                )
-                .0;
+                );
 
                 info!(
                     "Downloading {} to '{}'",
@@ -387,7 +386,7 @@ async fn download_video(ctx: &Context, format: &Format, only_audio: bool) -> Res
         ctx,
         &mut ffmpeg.stdin.unwrap(),
         Some(format!("Download {}", format.audio)),
-        format.stream.clone()
+        format.stream.clone(),
     )
     .await?;
 
diff --git a/crunchy-cli-core/src/cli/download.rs b/crunchy-cli-core/src/cli/download.rs
index 8535869..acb086b 100644
--- a/crunchy-cli-core/src/cli/download.rs
+++ b/crunchy-cli-core/src/cli/download.rs
@@ -178,8 +178,7 @@ impl Execute for Download {
                         .to_string(),
                         &format,
                     )),
-                )
-                .0;
+                );
 
                 let use_ffmpeg = if let Some(extension) = path.extension() {
                     if extension != "ts" {
@@ -228,11 +227,7 @@ impl Execute for Download {
     }
 }
 
-async fn download_ffmpeg(
-    ctx: &Context,
-    variant_data: VariantData,
-    target: &Path,
-) -> Result<()> {
+async fn download_ffmpeg(ctx: &Context, variant_data: VariantData, target: &Path) -> Result<()> {
     let ffmpeg = Command::new("ffmpeg")
         .stdin(Stdio::piped())
         .stdout(Stdio::null())
diff --git a/crunchy-cli-core/src/utils/os.rs b/crunchy-cli-core/src/utils/os.rs
index 317381d..92e4e9f 100644
--- a/crunchy-cli-core/src/utils/os.rs
+++ b/crunchy-cli-core/src/utils/os.rs
@@ -19,7 +19,7 @@ pub fn has_ffmpeg() -> bool {
     }
 }
 
-/// Any tempfiles should be created with this function. The prefix and directory of every file
+/// Any tempfile should be created with this function. The prefix and directory of every file
 /// created with this method stays the same which is helpful to query all existing tempfiles and
 /// e.g. remove them in a case of ctrl-c. Having one function also good to prevent mistakes like
 /// setting the wrong prefix if done manually.
@@ -36,17 +36,20 @@ pub fn tempfile<S: AsRef<str>>(suffix: S) -> io::Result<NamedTempFile> {
 }
 
 /// Check if the given path exists and rename it until the new (renamed) file does not exist.
-pub fn free_file(mut path: PathBuf) -> (PathBuf, bool) {
+pub fn free_file(mut path: PathBuf) -> PathBuf {
     let mut i = 0;
     while path.exists() {
         i += 1;
 
-        let ext = path.extension().unwrap().to_str().unwrap();
-        let mut filename = path.file_name().unwrap().to_str().unwrap();
-
-        filename = &filename[0..filename.len() - ext.len() - 1];
+        let ext = path.extension().unwrap().to_string_lossy();
+        let filename = path.file_stem().unwrap().to_string_lossy();
 
         path.set_file_name(format!("{} ({}).{}", filename, i, ext))
     }
-    (path, i != 0)
+    sanitize_file(path)
+}
+
+/// Sanitizes the given path to not contain any invalid file character.
+pub fn sanitize_file(path: PathBuf) -> PathBuf {
+    path.with_file_name(sanitize_filename::sanitize(path.file_name().unwrap().to_string_lossy()))
 }