diff --git a/R/format_tt.R b/R/format_tt.R
index f007876b..7a6250ce 100644
--- a/R/format_tt.R
+++ b/R/format_tt.R
@@ -8,7 +8,7 @@
 #' It allows various formatting options like significant digits, decimal points, and scientific notation.
 #' It also includes custom formatting for date and boolean values.
 #'
-#' @param x A data frame to be formatted.
+#' @param x A data frame or a vector to be formatted.
 #' @param digits Number of significant digits or decimal places.
 #' @param num_fmt The format for numeric values; one of 'significant', 'decimal', or 'scientific'.
 #' @param num_zero Logical; if TRUE, trailing zeros are kept in "decimal" format (but not in "significant" format).
@@ -51,6 +51,19 @@ format_tt <- function(x = NULL,
     msg <- "`format_tt()` must be called *before* `tt()`. You must format your dataset before drawing a table."
   }
 
+  if (isTRUE(check_atomic_vector(x))) {
+    atomic_vector <- TRUE
+    x <- data.frame(tinytable = x)
+    j <- 1
+  } else {
+    atomic_vector <- FALSE
+  }
+
+  if (!inherits(x, "data.frame")) {
+    msg <- "`x` must be a data frame or an atomic vector."
+    stop(msg, call. = FALSE)
+  }
+
   assert_data_frame(x)
   assert_integerish(digits, len = 1, null.ok = TRUE)
   assert_choice(num_fmt, c("significant", "decimal", "scientific"))
@@ -107,5 +120,10 @@ format_tt <- function(x = NULL,
 
   }
 
-  return(x)
+  if (isTRUE(atomic_vector)) {
+    return(x[[1]])
+  } else {
+    return(x)
+  }
+
 }
diff --git a/R/sanity.R b/R/sanity.R
index fd312537..9897c1d0 100644
--- a/R/sanity.R
+++ b/R/sanity.R
@@ -191,3 +191,15 @@ assert_function <- function(x, null.ok = FALSE, name = as.character(substitute(x
     stop(msg, call. = FALSE)
   }
 }
+
+check_atomic_vector<- function(x, null.ok = FALSE, name = as.character(substitute(x))) {
+  if (isTRUE(null.ok) && is.null(x)) return(invisible(TRUE))
+  flag <- is.atomic(x) && is.vector(x) && !is.list(x)
+  if (flag) {
+    out <- TRUE
+  } else {
+    out <- sprintf("`%s` must be an atomic vector.", name)
+  }
+  return(out)
+}
+
diff --git a/inst/tinytest/test-format_tt.R b/inst/tinytest/test-format_tt.R
index d343fde6..b07a493d 100644
--- a/inst/tinytest/test-format_tt.R
+++ b/inst/tinytest/test-format_tt.R
@@ -5,6 +5,10 @@ dat <- data.frame(
      y = as.Date(sample(1:1000, N)),
      z = sample(c(TRUE, FALSE), N, replace = TRUE)
 )
+
+# pkgload::load_all()
 dat |> 
   format_tt(digits = 4) |>
   tt()
+
+format_tt(dat$x, digits = 1)
diff --git a/man/format_tt.Rd b/man/format_tt.Rd
index 7de22778..d022cf13 100644
--- a/man/format_tt.Rd
+++ b/man/format_tt.Rd
@@ -20,7 +20,7 @@ format_tt(
 )
 }
 \arguments{
-\item{x}{A data frame to be formatted.}
+\item{x}{A data frame or a vector to be formatted.}
 
 \item{j}{Column indices where the styling should be applied. Can be a single value, a vector, or a Perl-style regular expression applied to column names of the original data frame. If \code{colspan} is used, \code{j} must be of length 1.}