diff --git a/Cargo.lock b/Cargo.lock
index 459879b..445c458 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1569,6 +1569,7 @@ dependencies = [
  "glob",
  "thiserror",
  "tracing",
+ "zip",
 ]
 
 [[package]]
@@ -1581,6 +1582,7 @@ dependencies = [
  "thiserror",
  "tracing",
  "tracing-subscriber",
+ "zip",
 ]
 
 [[package]]
diff --git a/eco-cbz/src/cbz.rs b/eco-cbz/src/cbz.rs
index 69ed245..7da2915 100644
--- a/eco-cbz/src/cbz.rs
+++ b/eco-cbz/src/cbz.rs
@@ -244,6 +244,19 @@ where
         self.insert_with_extension_and_file_options(image, extension, FileOptions::default())
     }
 
+    /// ## Errors
+    ///
+    /// Same behavior as `insert_with_extension_and_file_options`
+    #[allow(clippy::missing_panics_doc)]
+    pub fn insert_with_file_options<R: BufRead + Seek>(
+        &mut self,
+        image: Image<R>,
+        file_options: FileOptions,
+    ) -> Result<()> {
+        let extension = image.format().extensions_str().first().unwrap();
+        self.insert_with_extension_and_file_options(image, extension, file_options)
+    }
+
     /// ## Errors
     ///
     /// Same behavior as `insert_with_extension_and_file_options`
diff --git a/eco-convert/src/lib.rs b/eco-convert/src/lib.rs
index 0a1ddef..a54d15c 100644
--- a/eco-convert/src/lib.rs
+++ b/eco-convert/src/lib.rs
@@ -53,6 +53,9 @@ pub struct ConvertOptions {
 
     /// Reading order
     pub reading_order: ReadingOrder,
+
+    /// If not provided the images are stored as is (fastest), value must be between 0-9
+    pub compression_level: Option<i32>,
 }
 
 #[allow(clippy::missing_errors_doc)]
@@ -70,6 +73,7 @@ pub fn convert(opts: ConvertOptions) -> Result<()> {
                 opts.blur,
                 opts.autosplit,
                 opts.reading_order,
+                opts.compression_level,
             )?
         }
         Format::Pdf => {
@@ -83,6 +87,7 @@ pub fn convert(opts: ConvertOptions) -> Result<()> {
                 opts.blur,
                 opts.autosplit,
                 opts.reading_order,
+                opts.compression_level,
             )?
         }
     };
diff --git a/eco-merge/Cargo.toml b/eco-merge/Cargo.toml
index 3c4ce1d..1dee124 100644
--- a/eco-merge/Cargo.toml
+++ b/eco-merge/Cargo.toml
@@ -10,3 +10,4 @@ eco-cbz.workspace = true
 glob.workspace = true
 thiserror.workspace = true
 tracing.workspace = true
+zip.workspace = true
diff --git a/eco-merge/src/lib.rs b/eco-merge/src/lib.rs
index c81367b..20eedae 100644
--- a/eco-merge/src/lib.rs
+++ b/eco-merge/src/lib.rs
@@ -4,6 +4,7 @@ use camino::Utf8PathBuf;
 use eco_cbz::{CbzReader, CbzWriter};
 use glob::glob;
 use tracing::warn;
+use zip::{write::FileOptions, CompressionMethod};
 
 pub use crate::errors::{Error, Result};
 
@@ -19,12 +20,22 @@ pub struct MergeOptions {
 
     /// The merged archive name
     pub name: String,
+
+    /// If not provided the images are stored as is (fastest), value must be between 0-9
+    pub compression_level: Option<i32>,
 }
 
 #[allow(clippy::missing_errors_doc, clippy::needless_pass_by_value)]
 pub fn merge(opts: MergeOptions) -> Result<()> {
     let mut merged_cbz_writer = CbzWriter::default();
 
+    let mut file_options = FileOptions::default();
+    if let Some(compression_level) = opts.compression_level {
+        file_options = file_options.compression_level(Some(compression_level));
+    } else {
+        file_options = file_options.compression_method(CompressionMethod::Stored);
+    }
+
     for path in glob(&opts.archives_glob)? {
         let mut current_cbz = CbzReader::try_from_path(path?)?;
 
@@ -36,7 +47,7 @@ pub fn merge(opts: MergeOptions) -> Result<()> {
                     return Ok::<(), Error>(());
                 }
             };
-            merged_cbz_writer.insert(image)?;
+            merged_cbz_writer.insert_with_file_options(image, file_options)?;
 
             Ok::<(), Error>(())
         })?;
diff --git a/eco-pack/Cargo.toml b/eco-pack/Cargo.toml
index 739dde6..acb957c 100644
--- a/eco-pack/Cargo.toml
+++ b/eco-pack/Cargo.toml
@@ -11,3 +11,4 @@ glob.workspace = true
 thiserror.workspace = true
 tracing.workspace = true
 tracing-subscriber.workspace = true
+zip.workspace = true
diff --git a/eco-pack/src/lib.rs b/eco-pack/src/lib.rs
index fc2a0b9..134f6d1 100644
--- a/eco-pack/src/lib.rs
+++ b/eco-pack/src/lib.rs
@@ -13,6 +13,7 @@ use eco_cbz::{
 };
 use glob::glob;
 use tracing::{debug, error};
+use zip::{write::FileOptions, CompressionMethod};
 
 pub use crate::errors::{Error, Result};
 
@@ -45,8 +46,17 @@ pub fn pack_imgs_to_cbz<R: BufRead + Seek>(
     blur: Option<f32>,
     autosplit: bool,
     reading_order: ReadingOrder,
+    compression_level: Option<i32>,
 ) -> Result<CbzWriter<Cursor<Vec<u8>>>> {
     let mut cbz_writer = CbzWriter::default();
+
+    let mut file_options = FileOptions::default();
+    if let Some(compression_level) = compression_level {
+        file_options = file_options.compression_level(Some(compression_level));
+    } else {
+        file_options = file_options.compression_method(CompressionMethod::Stored);
+    }
+
     for mut img in imgs {
         if let Some(contrast) = contrast {
             img = img.set_contrast(contrast);
@@ -60,10 +70,10 @@ pub fn pack_imgs_to_cbz<R: BufRead + Seek>(
         if autosplit && img.is_landscape() {
             debug!("splitting landscape file");
             let (img_left, img_right) = img.autosplit(reading_order);
-            cbz_writer.insert(img_left)?;
-            cbz_writer.insert(img_right)?;
+            cbz_writer.insert_with_file_options(img_left, file_options)?;
+            cbz_writer.insert_with_file_options(img_right, file_options)?;
         } else {
-            cbz_writer.insert(img)?;
+            cbz_writer.insert_with_file_options(img, file_options)?;
         }
     }
 
@@ -95,6 +105,9 @@ pub struct PackOptions {
 
     /// Reading order
     pub reading_order: ReadingOrder,
+
+    /// If not provided the images are stored as is (fastest), value must be between 0-9
+    pub compression_level: Option<i32>,
 }
 
 #[allow(clippy::missing_errors_doc)]
@@ -117,6 +130,7 @@ pub fn pack(opts: PackOptions) -> Result<()> {
         opts.blur,
         opts.autosplit,
         opts.reading_order,
+        opts.compression_level,
     )?;
 
     cbz_writer.write_to_path(outdir.join(format!("{}.cbz", opts.name)))?;
diff --git a/eco/src/main.rs b/eco/src/main.rs
index 077c1b4..7cf7337 100644
--- a/eco/src/main.rs
+++ b/eco/src/main.rs
@@ -62,6 +62,10 @@ enum Command {
         /// Reading order
         #[clap(long, default_value_t = ReadingOrder::Rtl)]
         reading_order: ReadingOrder,
+
+        /// If not provided the images are stored as is (fastest), value must be between 0-9
+        #[clap(long)]
+        compression_level: Option<i32>,
     },
     Merge {
         /// A glob that matches all the archive to merge
@@ -75,6 +79,10 @@ enum Command {
         /// The merged archive name
         #[clap(short, long)]
         name: String,
+
+        /// If not provided the images are stored as is (fastest), value must be between 0-9
+        #[clap(long)]
+        compression_level: Option<i32>,
     },
     Pack {
         /// A glob that matches all the files to pack
@@ -107,6 +115,10 @@ enum Command {
         /// Reading order
         #[clap(long, default_value_t = ReadingOrder::Rtl)]
         reading_order: ReadingOrder,
+
+        /// If not provided the images are stored as is (fastest), value must be between 0-9
+        #[clap(long)]
+        compression_level: Option<i32>,
     },
     View {
         /// The path to the e-book file to view
@@ -133,6 +145,7 @@ fn main() -> Result<()> {
             blur,
             autosplit,
             reading_order,
+            compression_level,
         } => eco_convert::convert(eco_convert::ConvertOptions {
             path,
             from: from.into(),
@@ -143,15 +156,18 @@ fn main() -> Result<()> {
             blur,
             autosplit,
             reading_order: reading_order.into(),
+            compression_level,
         })?,
         Command::Merge {
             archives_glob,
             outdir,
             name,
+            compression_level,
         } => eco_merge::merge(eco_merge::MergeOptions {
             archives_glob,
             outdir,
             name,
+            compression_level,
         })?,
         Command::Pack {
             files_descriptor,
@@ -162,6 +178,7 @@ fn main() -> Result<()> {
             blur,
             autosplit,
             reading_order,
+            compression_level,
         } => eco_pack::pack(eco_pack::PackOptions {
             files_descriptor,
             outdir,
@@ -171,6 +188,7 @@ fn main() -> Result<()> {
             blur,
             autosplit,
             reading_order: reading_order.into(),
+            compression_level,
         })?,
         Command::View { path, type_ } => eco_view::view(eco_view::ViewOptions {
             path,