diff --git a/crates/forms/src/af.rs b/crates/forms/src/af.rs
index 37ee30ca..be38a954 100644
--- a/crates/forms/src/af.rs
+++ b/crates/forms/src/af.rs
@@ -823,7 +823,8 @@ pub fn format_value(f: &Format, value: &str) -> String {
 /// (numbers are normalised), or Acrobat's message.
 pub fn keystroke(f: &Format, field: &str, value: &str) -> Result<String, String> {
     let bad = || format!("The value entered does not match the format of the field [ {field} ]");
-    if value.trim().is_empty() {
+    // Blank input clears a formatted field; without a format, whitespace is text like any other.
+    if *f != Format::None && value.trim().is_empty() {
         return Ok(String::new());
     }
     match f {
@@ -1045,6 +1046,9 @@ mod tests {
             keystroke(&n(2, 0, 0, "$", true), "Total", "ten"),
             Err("The value entered does not match the format of the field [ Total ]".into())
         );
+        // Blank input clears a formatted field (#1323); without a format it is text like any other.
+        assert_eq!(keystroke(&n(2, 0, 0, "$", true), "Total", " \t"), Ok(String::new()));
+        assert_eq!(keystroke(&Format::None, "Name", " \t"), Ok(" \t".into()));
     }
 
     #[test]
diff --git a/crates/forms/src/tests.rs b/crates/forms/src/tests.rs
index bee36653..5410d767 100644
--- a/crates/forms/src/tests.rs
+++ b/crates/forms/src/tests.rs
@@ -232,6 +232,21 @@ fn opt_export_values_select_button_states() {
     assert!(err.to_string().contains("options: Post, Pick-up"), "{err}");
 }
 
+/// Issue #1323: a text field without a format keeps a whitespace-only value as typed; only an
+/// empty value clears it.
+#[test]
+fn whitespace_only_text_is_kept_in_a_field_without_a_format() {
+    for value in [" ", "\t", "\u{a0}"] {
+        let mut doc = fixture();
+        set_value(&mut doc, "name", &FieldValue::Text(value.into())).unwrap();
+        let doc = reopen(&doc);
+        assert_eq!(field(&fields(&doc), "name").value, [value], "{value:?}");
+    }
+    let mut doc = fixture();
+    set_value(&mut doc, "name", &FieldValue::Text(String::new())).unwrap();
+    assert!(field(&fields(&reopen(&doc)), "name").value.is_empty());
+}
+
 #[test]
 fn text_fields_get_new_appearances() {
     let mut doc = fixture();