diff --git a/DESCRIPTION b/DESCRIPTION
index c288e23..357bfb1 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,9 +1,11 @@
 Package: openxlsx2Extras
 Title: Extra Functions for the openxlsx2 package
 Version: 0.0.0.9000
-Authors@R: 
+Authors@R: c(
     person("Eli", "Pousson", , "eli.pousson@gmail.com", role = c("aut", "cre", "cph"),
-           comment = c(ORCID = "0000-0001-8280-1706"))
+           comment = c(ORCID = "0000-0001-8280-1706")),
+    person("Jan Marvin", "Garbuszus", , "jan.garbuszus@ruhr-uni-bochum.de", role = "ctb")
+  )
 Description: Extends the openxlsx2 package with wrapper and helper
     functions designed to add new features and options when working with
     Excel workbooks.
@@ -11,15 +13,16 @@ License: MIT + file LICENSE
 URL: https://github.com/elipousson/openxlsx2Extras,
     https://elipousson.github.io/openxlsx2Extras/
 BugReports: https://github.com/elipousson/openxlsx2Extras/issues
-Imports: 
+Imports:
     cli,
     fs,
     lifecycle,
     openxlsx2,
     purrr,
     rlang,
+    utils,
     vctrs
-Suggests: 
+Suggests:
     dplyr,
     gt,
     marquee,
@@ -27,8 +30,8 @@ Suggests:
     testthat (>= 3.0.0),
     tidyselect,
     withr
+Config/testthat/edition: 3
 Encoding: UTF-8
 Language: en-US
 Roxygen: list(markdown = TRUE)
 RoxygenNote: 7.3.2
-Config/testthat/edition: 3
diff --git a/NAMESPACE b/NAMESPACE
index dfab75b..b5cdaeb 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -3,6 +3,8 @@
 export(as_sheet_list)
 export(as_sheet_names)
 export(as_wb)
+export(csv_to_wb)
+export(csv_to_xlsx)
 export(fmt_lgl_cols)
 export(fmt_marquee_txt)
 export(map_wb)
@@ -24,10 +26,13 @@ export(wb_sheets_fmt)
 export(wb_split)
 export(wb_to_df_list)
 export(write_xlsx_ext)
+export(xlsx_to_csv)
 import(rlang)
 importFrom(cli,cli_abort)
 importFrom(cli,cli_warn)
 importFrom(fs,file_exists)
+importFrom(fs,file_temp)
+importFrom(fs,path_ext_set)
 importFrom(lifecycle,badge)
 importFrom(lifecycle,deprecated)
 importFrom(openxlsx2,current_sheet)
@@ -36,6 +41,9 @@ importFrom(openxlsx2,wb_add_numfmt)
 importFrom(openxlsx2,wb_data)
 importFrom(openxlsx2,wb_set_col_widths)
 importFrom(openxlsx2,wb_to_df)
+importFrom(openxlsx2,write_xlsx)
 importFrom(purrr,list_cbind)
 importFrom(purrr,map_chr)
+importFrom(utils,read.csv)
+importFrom(utils,write.csv)
 importFrom(vctrs,vec_recycle)
diff --git a/R/convert_to.R b/R/convert_to.R
new file mode 100644
index 0000000..207fa8a
--- /dev/null
+++ b/R/convert_to.R
@@ -0,0 +1,113 @@
+#' Convert CSV to XLSX files or XLSX to CSV
+#'
+#' @description A set of functions to convert between CSV and XLSX formats using
+#'  flexible input and output options.
+#'
+#' @details
+#' These functions allow seamless conversion between CSV and XLSX formats:
+#'
+#' - `csv_to_wb`: Reads one or more CSV files and writes them to a workbook
+#'  object.
+#' - `csv_to_xlsx`: Converts one or more CSV files to a XLSX file.
+#' - `xlsx_to_csv`: Converts an XLSX file to a CSV file.
+#'
+#' @name convert_to
+#' @author Jordan Mark Barbone \email{jmbarbone@gmail.com}
+#' @author Jan Marvin Garbuszus \email{jan.garbuszus@ruhr-uni-bochum.de}
+#' @author Eli Pousson \email{eli.pousson@gmail.com}
+#'
+#' @importFrom utils read.csv write.csv
+#' @importFrom openxlsx2 write_xlsx wb_to_df
+#'
+#' @examples
+#' # Create example CSV file
+#' csv <- tempfile(fileext = ".csv")
+#' utils::write.csv(x = mtcars, file = csv)
+#'
+#' # Convert CSV to Workbook
+#' wb <- csv_to_wb(csv = csv)
+#'
+#' # Convert CSV to XLSX
+#' xlsx <- openxlsx2::temp_xlsx()
+#' csv_to_xlsx(csv = csv, xlsx = xlsx)
+#'
+#' # Convert XLSX back to CSV
+#' xlsx_to_csv(x = xlsx, csv = csv)
+NULL
+
+#' @rdname convert_to
+#' @param file Path or paths to input files. For [csv_to_wb()], users
+#' can pass multiple CSV files when creating a workbook or xlsx file.  If these
+#' inputs are named, the names are used as worksheet names.
+#' @param new_file Path to output file. Optional. If `new_file` is not supplied
+#' and `file` is a string, `new_file` is set to use the same path with a new
+#' file extension or (if file is not a string) `new_file` is set to a temporary
+#' file.
+#' @param .f Function used to read or write the csv file. Defaults to
+#' `utils::read.csv` for [csv_to_wb()] and [csv_to_xlsx()] and
+#' `utils::write.csv` for [xlsx_to_csv()]. Other functions are allowed but must
+#' use the input or output file name as the second argument.
+#' @param ... additional arguments passed to [openxlsx2::write_xlsx()]
+#' @export
+csv_to_wb <- function(file,
+                      new_file = NULL,
+                      .f = utils::read.csv,
+                      ...) {
+  x <- lapply(file, .f)
+  openxlsx2::write_xlsx(x = x, file = set_new_file(file, new_file), ...)
+}
+
+#' @rdname convert_to
+#' @export
+csv_to_xlsx <- function(file,
+                        new_file = NULL,
+                        .f = utils::read.csv,
+                        ...) {
+  csv_to_wb(
+    file,
+    .f = .f,
+    ...
+  )$save(
+    file = set_new_file(file, new_file, ext = "xlsx")
+  )
+}
+
+#' @rdname convert_to
+#' @param sheet A sheet in the workbook specified by `file` (either an index or
+#' a sheet name). Defaults to 1.
+#' @param ext File extension for output file. Defaults to "csv".
+#' @param ... Additional arguments passed to `.f`
+#' @export
+xlsx_to_csv <- function(file,
+                        new_file = NULL,
+                        sheet = 1,
+                        .f = utils::write.csv,
+                        ext = "csv",
+                        ...) {
+  .f(
+    openxlsx2::wb_to_df(
+      file = file,
+      sheet = sheet
+    ),
+    set_new_file(file, new_file, ext = ext),
+    ...
+  )
+}
+
+#' [set_new_file()] sets new_file based on file or as temporary file.
+#' @noRd
+#' @importFrom fs path_ext_set file_temp
+set_new_file <- function(file = NULL,
+                         new_file = NULL,
+                         tmp_dir = tempdir(),
+                         ext = "xlsx") {
+  if (!is.null(new_file)) {
+    return(new_file)
+  }
+
+  if (is.character(file)) {
+    return(fs::path_ext_set(file, ext))
+  }
+
+  fs::file_temp(tmp_dir = tmp_dir, ext = ext)
+}
diff --git a/man/convert_to.Rd b/man/convert_to.Rd
new file mode 100644
index 0000000..8941732
--- /dev/null
+++ b/man/convert_to.Rd
@@ -0,0 +1,79 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/convert_to.R
+\name{convert_to}
+\alias{convert_to}
+\alias{csv_to_wb}
+\alias{csv_to_xlsx}
+\alias{xlsx_to_csv}
+\title{Convert CSV to XLSX files or XLSX to CSV}
+\usage{
+csv_to_wb(file, new_file = NULL, .f = utils::read.csv, ...)
+
+csv_to_xlsx(file, new_file = NULL, .f = utils::read.csv, ...)
+
+xlsx_to_csv(
+  file,
+  new_file = NULL,
+  sheet = 1,
+  .f = utils::write.csv,
+  ext = "csv",
+  ...
+)
+}
+\arguments{
+\item{file}{Path or paths to input files. For \code{\link[=csv_to_wb]{csv_to_wb()}}, users
+can pass multiple CSV files when creating a workbook or xlsx file.  If these
+inputs are named, the names are used as worksheet names.}
+
+\item{new_file}{Path to output file. Optional. If \code{new_file} is not supplied
+and \code{file} is a string, \code{new_file} is set to use the same path with a new
+file extension or (if file is not a string) \code{new_file} is set to a temporary
+file.}
+
+\item{.f}{Function used to read or write the csv file. Defaults to
+\code{utils::read.csv} for \code{\link[=csv_to_wb]{csv_to_wb()}} and \code{\link[=csv_to_xlsx]{csv_to_xlsx()}} and
+\code{utils::write.csv} for \code{\link[=xlsx_to_csv]{xlsx_to_csv()}}. Other functions are allowed but must
+use the input or output file name as the second argument.}
+
+\item{...}{Additional arguments passed to \code{.f}}
+
+\item{sheet}{A sheet in the workbook specified by \code{file} (either an index or
+a sheet name). Defaults to 1.}
+
+\item{ext}{File extension for output file. Defaults to "csv".}
+}
+\description{
+A set of functions to convert between CSV and XLSX formats using
+flexible input and output options.
+}
+\details{
+These functions allow seamless conversion between CSV and XLSX formats:
+\itemize{
+\item \code{csv_to_wb}: Reads one or more CSV files and writes them to a workbook
+object.
+\item \code{csv_to_xlsx}: Converts one or more CSV files to a XLSX file.
+\item \code{xlsx_to_csv}: Converts an XLSX file to a CSV file.
+}
+}
+\examples{
+# Create example CSV file
+csv <- tempfile(fileext = ".csv")
+utils::write.csv(x = mtcars, file = csv)
+
+# Convert CSV to Workbook
+wb <- csv_to_wb(csv = csv)
+
+# Convert CSV to XLSX
+xlsx <- openxlsx2::temp_xlsx()
+csv_to_xlsx(csv = csv, xlsx = xlsx)
+
+# Convert XLSX back to CSV
+xlsx_to_csv(x = xlsx, csv = csv)
+}
+\author{
+Jordan Mark Barbone \email{jmbarbone@gmail.com}
+
+Jan Marvin Garbuszus \email{jan.garbuszus@ruhr-uni-bochum.de}
+
+Eli Pousson \email{eli.pousson@gmail.com}
+}
diff --git a/man/openxlsx2Extras-package.Rd b/man/openxlsx2Extras-package.Rd
index 12af450..644358f 100644
--- a/man/openxlsx2Extras-package.Rd
+++ b/man/openxlsx2Extras-package.Rd
@@ -20,5 +20,10 @@ Useful links:
 \author{
 \strong{Maintainer}: Eli Pousson \email{eli.pousson@gmail.com} (\href{https://orcid.org/0000-0001-8280-1706}{ORCID}) [copyright holder]
 
+Other contributors:
+\itemize{
+  \item Jan Marvin Garbuszus \email{jan.garbuszus@ruhr-uni-bochum.de} [contributor]
+}
+
 }
 \keyword{internal}
diff --git a/man/wb_set_col_widths_ext.Rd b/man/wb_set_col_widths_ext.Rd
index 351b91e..792667b 100644
--- a/man/wb_set_col_widths_ext.Rd
+++ b/man/wb_set_col_widths_ext.Rd
@@ -26,7 +26,7 @@ software. See \strong{Details} for general information on column widths.}
 \description{
 \code{\link[=wb_set_col_widths_ext]{wb_set_col_widths_ext()}} extends \code{\link[openxlsx2:col_widths-wb]{openxlsx2::wb_set_col_widths()}} by making
 \code{cols} optional (defaults to all columns) and allows setting columns based on
-column names.
+column names (rather than index position alone).
 }
 \examples{
 wb <- as_wb(mtcars)
diff --git a/tests/testthat/test-convert_to.R b/tests/testthat/test-convert_to.R
new file mode 100644
index 0000000..f0c1316
--- /dev/null
+++ b/tests/testthat/test-convert_to.R
@@ -0,0 +1,31 @@
+test_that("magic conversion functions work", {
+  ## temporary files
+  csv <- tempfile(fileext = ".csv")
+  xlsx <- openxlsx2::temp_xlsx()
+
+  ## create example csv
+  utils::write.csv(x = mtcars, file = csv, row.names = FALSE)
+
+  ## works even with other packages
+  wb <- csv_to_wb(csv)
+  expect_equal(openxlsx2::wb_to_df(wb), mtcars, ignore_attr = TRUE)
+
+  csv_to_xlsx(csv, xlsx)
+  expect_equal(openxlsx2::wb_to_df(xlsx), mtcars, ignore_attr = TRUE)
+
+  csv_to_xlsx(list(foo = csv), xlsx)
+  expect_equal(
+    openxlsx2::wb_get_sheet_names(openxlsx2::wb_load(xlsx)),
+    c(foo = "foo")
+  )
+
+  ## use other arguments frequently passed to openxlsx2::write_xlsx()
+  csv_to_xlsx(csv, xlsx, as_table = TRUE)
+
+  expect_equal(openxlsx2::wb_load(xlsx)$get_tables()$tab_name, "Table1")
+
+  ## go the other way around from spreadsheet to csv
+  xlsx_to_csv(xlsx, csv, row.names = FALSE)
+
+  expect_equal(read.csv(csv), mtcars, ignore_attr = TRUE)
+})