diff --git a/docs/changelog.rst b/docs/changelog.rst
index 6cc7e6102..b083c7b18 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -229,6 +229,8 @@ Detailed list of changes
 
 - hints kitten: Fix trailing punctuation not being removed from URLs (:pull:`9828`)
 
+- Fix copy/paste dropping spaces at soft-wrap boundaries when ``strip_trailing_spaces`` is set (:iss:`9834`)
+
 0.46.2 [2026-03-21]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/kitty/screen.c b/kitty/screen.c
index c0e8864b2..705fc5656 100644
--- a/kitty/screen.c
+++ b/kitty/screen.c
@@ -3967,7 +3967,10 @@ text_for_range(Screen *self, const Selection *sel, bool insert_newlines, bool st
         while (x_limit && !line->cpu_cells[x_limit - 1].temp_flag) x_limit--;
         while (x_start < x_limit && !line->cpu_cells[x_start].temp_flag) x_start++;
         bool is_only_whitespace_line = false;
-        if (strip_trailing_whitespace) {
+        // Don't strip trailing whitespace from soft-wrapped lines as those spaces
+        // are part of the original text content that continues on the next line
+        const bool line_is_continued = x_limit == line->xnum && line->cpu_cells[line->xnum-1].next_char_was_wrapped;
+        if (strip_trailing_whitespace && !line_is_continued) {
             index_type new_limit = limit_without_trailing_whitespace(line, x_limit);
             if (new_limit != x_limit) {
                 x_limit = new_limit;
@@ -4018,7 +4021,10 @@ ansi_for_range(Screen *self, const Selection *sel, bool insert_newlines, bool st
         while (x_limit && !line->cpu_cells[x_limit - 1].temp_flag) x_limit--;
         while (x_start < x_limit && !line->cpu_cells[x_start].temp_flag) x_start++;
         bool is_only_whitespace_line = false;
-        if (strip_trailing_whitespace) {
+        // Don't strip trailing whitespace from soft-wrapped lines as those spaces
+        // are part of the original text content that continues on the next line
+        const bool line_is_continued = x_limit == line->xnum && line->cpu_cells[line->xnum-1].next_char_was_wrapped;
+        if (strip_trailing_whitespace && !line_is_continued) {
             index_type new_limit = limit_without_trailing_whitespace(line, x_limit);
             if (new_limit != x_limit) {
                 x_limit = new_limit;
diff --git a/kitty_tests/screen.py b/kitty_tests/screen.py
index d0c604862..e444a6318 100644
--- a/kitty_tests/screen.py
+++ b/kitty_tests/screen.py
@@ -702,13 +702,15 @@ class TestScreen(BaseTest):
         s.start_selection(0, 0)
         s.update_selection(1, 3)
         self.ae(ts(), ''.join(('ab   ', 'cd')))
-        self.ae(ts(False, True), ''.join(('ab', 'cd')))
+        # soft-wrapped lines preserve trailing spaces (issue #9834)
+        self.ae(ts(False, True), 'ab   cd')
         s.reset()
         s.draw('ab        cd')
         s.start_selection(0, 0)
         s.update_selection(3, 4)
         self.ae(s.text_for_selection(), ('ab   ', '     ', 'cd'))
-        self.ae(s.text_for_selection(False, True), ('ab', '\n', 'cd'))
+        # soft-wrapped lines preserve trailing spaces (issue #9834)
+        self.ae(s.text_for_selection(False, True), ('ab   ', '     ', 'cd'))
         s.reset()
         s.draw('a')
         s.select_graphic_rendition(32)
@@ -719,7 +721,8 @@ class TestScreen(BaseTest):
         s.update_selection(1, 3)
         self.ae(s.text_for_selection(), ('abc  ', 'xy'))
         self.ae(s.text_for_selection(True), ('a\x1b[32mb\x1b[39mc  ', 'xy', '\x1b[m'))
-        self.ae(s.text_for_selection(True, True), ('a\x1b[32mb\x1b[39mc', 'xy', '\x1b[m'))
+        # soft-wrapped lines preserve trailing spaces in ANSI mode too (issue #9834)
+        self.ae(s.text_for_selection(True, True), ('a\x1b[32mb\x1b[39mc  ', 'xy', '\x1b[m'))
         # ]]]]]]]]]]]]]]]]]]]]
         s.reset()
         s.draw('a'), s.carriage_return(), s.linefeed(), s.linefeed(), s.draw('b')
@@ -727,6 +730,16 @@ class TestScreen(BaseTest):
         s.update_selection(4, 4)
         self.ae(''.join(s.text_for_selection()), 'a\n\nb')
         self.ae(''.join(s.text_for_selection(True)), 'a\n\nb')
+        # Trailing spaces on soft-wrapped lines must be preserved when strip_trailing_whitespace
+        # is set: a space at the line-wrap boundary is word-separator content, not padding
+        # (regression test for issue #9834)
+        s.reset()
+        s.draw('1234 5')  # "1234 " soft-wraps at col 4; space must survive stripping
+        s.start_selection(0, 0)
+        s.update_selection(4, 4)
+        self.ae(s.text_for_selection(), ('1234 ', '5'))
+        self.ae(s.text_for_selection(False, True), ('1234 ', '5'))
+        self.ae(s.text_for_selection(True, True), ('1234 ', '5', ''))
 
     def test_soft_hyphen(self):
         s = self.create_screen()