diff --git a/Cargo.toml b/Cargo.toml
index 8c2992c..b5dfdce 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,11 +5,14 @@ edition = "2024"
 
 [dependencies]
 clap = { version = "4.5.48", features = ["derive"] }
-polars = {version = "0.53.0", optional = true}
+polars = {version = "0.53.0", optional = true, features=["lazy"]}
 rhai = "1.23.6"
 umya-spreadsheet = "2.3.3"
 
 [features]
-default = ["csv"]
+default = ["csv", "lazyframe"]
 csv = []
 lazyframe = ["dep:polars"]
+
+[package.metadata.docs.rs]
+all-features = true
\ No newline at end of file
diff --git a/src/arguments.rs b/src/arguments.rs
index c725c34..bfd657f 100644
--- a/src/arguments.rs
+++ b/src/arguments.rs
@@ -88,7 +88,7 @@ impl fmt::Display for NumberRows {
 }
 
 #[derive(Parser, Debug, Clone)]
-pub struct RawArguments {
+pub(crate) struct RawArguments {
     /// Path to the xlsx file
     #[arg()]
     pub file: String,
@@ -128,45 +128,47 @@ pub struct RawArguments {
     /// replacement for end of line character inside cells
     #[arg(short = 'R', long)]
     pub replace_end_of_line_by: Option<String>,
-    /// a rhai function to filter lines
-    #[arg(long)]
-    pub filter: Option<String>,
 }
 
+/// Arguments structure is used to parse shell arguments (using clap)
+///
+/// Argument is also implicitly used by the XlsxReader .with_...() methods.
 #[derive(Debug, Clone)]
 pub struct Arguments {
     /// Path to the xlsx file
-    pub file: String,
-    /// List all worksheets
-    pub list_worksheets: bool,
-    /// Separator
-    pub separator: char,
-    /// Replace separator char in cells by
-    pub replace_separator_by: Option<String>,
-    /// include hidden lines to output
-    // pub include_hidden: IncludeHidden,
-    pub include_hidden_rows: bool,
-    pub include_hidden_columns: bool,
-    /// If merged cells, fill horizontally, vertically, both, or none
-    // pub fill_merged_cells: FillMergedCells,
-    pub fill_merged_cells_horizontal: bool,
-    pub fill_merged_cells_vertical: bool,
-    /// Chosse worksheet
-    pub worksheet: String,
+    pub(crate) file: String,
+    /// List all worksheets in the xlsx file
+    pub(crate) list_worksheets: bool,
+    /// Choose worksheet as name or number
+    pub(crate) worksheet: String,
     /// Use the worksheet that was active when the file was last saved
-    pub active_worksheet: bool,
+    pub(crate) active_worksheet: bool,
     /// Trim white spaces at end of cells
-    pub trim: TrimSpaces,
+    /// Include hidden lines to output
+    // pub(crate) include_hidden: IncludeHidden,
+    pub(crate) include_hidden_rows: bool,
+    /// Include hidden columns to output
+    pub(crate) include_hidden_columns: bool,
+    /// If merged cells, fill horizontally
+    // pub(crate) fill_merged_cells: FillMergedCells,
+    pub(crate) fill_merged_cells_horizontal: bool,
+    /// If merged cells, fill vertically
+    pub(crate) fill_merged_cells_vertical: bool,
+    /// trim spaces at end of file
+    pub(crate) trim: TrimSpaces,
     /// number the rows in first cell of each line
-    pub number_rows: NumberRows,
-    /// avoid nth first rows of xlsx file
-    pub skip_rows: u32,
-    /// change end of line character
-    pub end_of_line: String,
-    /// replacement for end of line character inside cells
-    pub replace_end_of_line_by: Option<String>,
-    /// a rhai function to filter lines
-    pub filter: Option<String>,
+    pub(crate) number_rows: NumberRows,
+    /// Avoid nth first rows of xlsx file
+    pub(crate) skip_rows: u32,
+    ///# csv output specific options
+    /// Separator for output
+    pub(crate) separator: char,
+    /// Replace separator char in cells by another
+    pub(crate) replace_separator_by: Option<String>,
+    /// Set the end of line string, defaults to "\n"
+    pub(crate) end_of_line: String,
+    /// replacement for end of line string inside cells
+    pub(crate) replace_end_of_line_by: Option<String>,
 }
 
 impl Arguments {
@@ -194,7 +196,6 @@ impl Default for Arguments {
             skip_rows: Default::default(),
             end_of_line: String::from("\n"),
             replace_end_of_line_by: Default::default(),
-            filter: Default::default(),
         }
     }
 }
@@ -232,7 +233,6 @@ impl From<RawArguments> for Arguments {
             skip_rows: raw.skip_rows,
             end_of_line: raw.end_of_line,
             replace_end_of_line_by: raw.replace_end_of_line_by,
-            filter: raw.filter,
         }
     }
 }
diff --git a/src/error.rs b/src/error.rs
index 9011a9f..5b38f86 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -5,6 +5,7 @@ pub enum Error {
     Msg(String),
     XlsxError(String),
     IoError(String),
+    PolarsError(String),
 }
 
 impl fmt::Display for Error {
@@ -13,6 +14,7 @@ impl fmt::Display for Error {
             Error::Msg(msg) => write!(f, "XlsxToCsvError: {msg}"),
             Error::XlsxError(msg) => write!(f, "XlsxError: {msg}"),
             Error::IoError(msg) => write!(f, "IoError: {msg}"),
+            Error::PolarsError(msg) => write!(f, "PolarsError: {msg}"),
         }
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 99e41e2..2e10389 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -3,7 +3,7 @@ pub mod error;
 pub mod xlsx;
 pub mod xlsx_builder;
 
-//#[cfg(feature = "csv")]
+#[cfg(feature = "csv")]
 pub mod xlsx_to_csv;
 
 #[cfg(feature = "lazyframe")]
diff --git a/src/main.rs b/src/main.rs
index b9187ed..d978d34 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,9 +1,13 @@
-use xlsxtocsv::{error::Error, xlsx::XlsxReader, xlsx_to_csv::Output};
+pub use xlsxtocsv::{error::Error, xlsx::XlsxReader};
 
 fn main() -> Result<(), Error> {
-    XlsxReader::new("noms.xlsx")
+    let lf = XlsxReader::new("noms.xlsx")
         .with_active_worksheet()
-        .to_csv(Output::Stdout)?;
+        .to_lazyframe()?;
+
+    let df = lf.collect()?;
+
+    println!("{df}");
 
     Ok(())
 }
diff --git a/src/xlsx.rs b/src/xlsx.rs
index 11eb030..9baf3ea 100644
--- a/src/xlsx.rs
+++ b/src/xlsx.rs
@@ -6,12 +6,13 @@ use umya_spreadsheet::{Cell, Range, Spreadsheet, Worksheet, reader};
 use crate::arguments::{Arguments, IntoArgs, NumberRows, TrimSpaces};
 use crate::error::Error;
 
+/// A reader for .xlsx files with extended options.
 #[derive(Debug, Clone)]
 pub struct XlsxReader {
     pub(crate) args: Arguments,
     pub(crate) book: Option<Spreadsheet>,
     pub(crate) sheet_index: Option<usize>,
-    pub worksheet_dimensions: RefCell<Option<(u32, u32)>>,
+    pub(crate) worksheet_dimensions: RefCell<Option<(u32, u32)>>,
 }
 
 impl XlsxReader {
diff --git a/src/xlsx_to_lazyframe.rs b/src/xlsx_to_lazyframe.rs
index e69de29..231f7f6 100644
--- a/src/xlsx_to_lazyframe.rs
+++ b/src/xlsx_to_lazyframe.rs
@@ -0,0 +1,51 @@
+use crate::{error::Error, xlsx::XlsxReader};
+use polars::prelude::*;
+
+impl From<PolarsError> for Error {
+    fn from(value: PolarsError) -> Self {
+        Error::PolarsError(value.to_string())
+    }
+}
+
+impl XlsxReader {
+    pub fn to_lazyframe(mut self) -> Result<LazyFrame, Error> {
+        self.finish()?;
+        let (num_cols, num_rows) = self.get_worksheet_dimensions();
+
+        let mut columns: Vec<Column> = (0..num_cols)
+            .map(|i| Column::new(format!("column_{i}").into(), Vec::<String>::new()))
+            .collect();
+
+        const CHUNK_SIZE: usize = 1000;
+        let mut chunk: Vec<Vec<String>> = Vec::with_capacity(CHUNK_SIZE);
+
+        for current_row in 0..num_rows {
+            let row = self.get_row(current_row);
+
+            chunk.push(row);
+
+            if chunk.len() >= CHUNK_SIZE {
+                append_chunk(&mut columns, &chunk);
+                chunk.clear();
+            }
+        }
+
+        if !chunk.is_empty() {
+            append_chunk(&mut columns, &chunk);
+        }
+
+        let df =
+            DataFrame::new(num_rows as usize, columns).map_err(|e| Error::from(e.to_string()))?;
+
+        Ok(df.lazy())
+    }
+}
+
+fn append_chunk(columns: &mut [Column], chunk: &[Vec<String>]) {
+    for (col_idx, column) in columns.iter_mut().enumerate() {
+        let chunk_data: Vec<String> = chunk.iter().map(|row| row[col_idx].clone()).collect();
+
+        let chunk_column = Column::new("temp".into(), chunk_data);
+        column.append(&chunk_column).unwrap();
+    }
+}