diff --git a/crates/formats/src/html.rs b/crates/formats/src/html.rs
index d651ea2462..839f973e8a 100644
--- a/crates/formats/src/html.rs
+++ b/crates/formats/src/html.rs
@@ -341,6 +341,25 @@ struct El {
 struct TableB {
     rows: Vec<Vec<Cell>>,
     row: Option<Vec<Cell>>,
+    /// The table or one of its cells asks for borders.
+    bordered: bool,
+}
+
+/// Whether an element's `border` attribute or `style` declares a visible border.
+fn declares_border(attrs: &[(String, String)], is_table: bool) -> bool {
+    if is_table && attr(attrs, "border").is_some_and(|b| b.trim().parse::<u32>().map(|n| n > 0).unwrap_or(b.trim().is_empty())) {
+        return true;
+    }
+    let Some(style) = attr(attrs, "style") else { return false };
+    style.split(';').any(|decl| {
+        let Some((name, value)) = decl.split_once(':') else { return false };
+        let name = name.trim().to_ascii_lowercase();
+        if !matches!(name.as_str(), "border" | "border-top" | "border-right" | "border-bottom" | "border-left") {
+            return false;
+        }
+        let value = value.trim().to_ascii_lowercase();
+        !value.is_empty() && !value.split_whitespace().any(|tok| matches!(tok, "none" | "hidden" | "0" | "0px" | "0pt"))
+    })
 }
 
 struct Builder {
@@ -750,7 +769,8 @@ impl Builder {
                     if let Some(r) = t.row.take() {
                         t.rows.push(r);
                     }
-                    let mut ft = FTable { rows: t.rows.into_iter().filter(|r| !r.is_empty()).collect(), widths: Vec::new() };
+                    let borderless = !t.bordered;
+                    let mut ft = FTable { rows: t.rows.into_iter().filter(|r| !r.is_empty()).collect(), widths: Vec::new(), borderless };
                     if !ft.rows.is_empty() {
                         ft.insert_covered();
                         self.container().push(FBlock::Table(ft));
@@ -959,7 +979,7 @@ impl Builder {
             preserve = true;
         }
         match kind {
-            ElKind::Table => self.tables.push(TableB { rows: Vec::new(), row: None }),
+            ElKind::Table => self.tables.push(TableB { rows: Vec::new(), row: None, bordered: declares_border(attrs, true) }),
             ElKind::Tr => {
                 if let Some(t) = self.tables.last_mut()
                     && let Some(r) = t.row.take()
@@ -969,6 +989,11 @@ impl Builder {
             }
             ElKind::Cell => {
                 let tb = self.find_open(|e| e.kind == ElKind::Tr, |e| e.kind == ElKind::Table).is_none();
+                if let Some(t) = self.tables.last_mut()
+                    && declares_border(attrs, false)
+                {
+                    t.bordered = true;
+                }
                 if tb && let Some(t) = self.tables.last_mut() {
                     // A cell without a row: start one.
                     if let Some(r) = t.row.take() {
@@ -1389,6 +1414,24 @@ mod tests {
             .collect()
     }
 
+    fn table_style(html: &str) -> Option<String> {
+        let doc = crate::model::to_doc(&parse(html));
+        doc.body.iter().find_map(|b| match &**b {
+            wordcraft_doc::Block::Table(t) => Some(t.props.style.clone().unwrap_or_default()),
+            _ => None,
+        })
+    }
+
+    #[test]
+    fn borderless_tables_get_no_grid_style() {
+        assert_eq!(table_style("<table><tr><td>a<td>b</table>").as_deref(), Some(""));
+        assert_eq!(table_style("<table style='border:none'><tr><td style='border:0'>a</table>").as_deref(), Some(""));
+        assert_eq!(table_style("<table border=0><tr><td style='border: 0px none'>a</table>").as_deref(), Some(""));
+        assert_eq!(table_style("<table border=1><tr><td>a</table>").as_deref(), Some("TableGrid"));
+        assert_eq!(table_style("<table style='border:1px solid #000'><tr><td>a</table>").as_deref(), Some("TableGrid"));
+        assert_eq!(table_style("<table><tr><td style='border:1px solid #999'>a</table>").as_deref(), Some("TableGrid"));
+    }
+
     #[test]
     fn tag_soup() {
         let f = parse(
diff --git a/crates/formats/src/model.rs b/crates/formats/src/model.rs
index 78efba93f9..f4f3ba911b 100644
--- a/crates/formats/src/model.rs
+++ b/crates/formats/src/model.rs
@@ -180,6 +180,8 @@ pub struct FTable {
     pub rows: Vec<Vec<Cell>>,
     /// Grid column widths in points (empty = equal widths).
     pub widths: Vec<f32>,
+    /// The source table had no borders (HTML default); the document table gets no grid style.
+    pub borderless: bool,
 }
 
 impl FTable {
@@ -426,6 +428,9 @@ impl Builder<'_> {
         let cols = t.cols().clamp(1, wordcraft_doc::table::MAX_COLS);
         let width = self.doc.last_section.text_width().max(72.0);
         let mut tb = Table::new(rows.len(), cols, width);
+        if t.borderless {
+            tb.props.style = None;
+        }
         if t.widths.len() == cols && t.widths.iter().all(|w| w.is_finite() && *w > 1.0) {
             tb.grid = t.widths.iter().map(|w| w.clamp(6.0, 1584.0)).collect();
         }
@@ -704,7 +709,7 @@ fn flow_table(doc: &Document, t: &Table, depth: usize) -> FTable {
         }
         rows.push(cells);
     }
-    FTable { rows, widths: t.grid.clone() }
+    FTable { rows, widths: t.grid.clone(), borderless: false }
 }
 
 /// The document body as a flow.
@@ -980,7 +985,11 @@ mod tests {
 
     #[test]
     fn covered_cells_inserted() {
-        let mut t = FTable { rows: vec![vec![Cell { rowspan: 2, ..Default::default() }, Cell::default()], vec![Cell::default()]], widths: vec![] };
+        let mut t = FTable {
+            rows: vec![vec![Cell { rowspan: 2, ..Default::default() }, Cell::default()], vec![Cell::default()]],
+            widths: vec![],
+            borderless: false,
+        };
         t.insert_covered();
         assert_eq!(t.rows[1].len(), 2);
         assert!(t.rows[1][0].covered);
diff --git a/crates/formats/src/odt.rs b/crates/formats/src/odt.rs
index af6c134d3b..151b8c2ed4 100644
--- a/crates/formats/src/odt.rs
+++ b/crates/formats/src/odt.rs
@@ -1243,7 +1243,7 @@ impl Body<'_> {
                 if let Some(t) = self.tables.pop()
                     && !t.rows.is_empty()
                 {
-                    self.container().push(FBlock::Table(FTable { rows: t.rows, widths: Vec::new() }));
+                    self.container().push(FBlock::Table(FTable { rows: t.rows, widths: Vec::new(), borderless: false }));
                 }
             }
             "desc" | "title" => self.in_desc = false,
@@ -1366,7 +1366,7 @@ pub fn parse(bytes: &[u8]) -> Result<Flow, String> {
     let mut blocks = body.containers.pop().unwrap_or_default();
     for t in body.tables.drain(..) {
         if !t.rows.is_empty() {
-            blocks.push(FBlock::Table(FTable { rows: t.rows, widths: Vec::new() }));
+            blocks.push(FBlock::Table(FTable { rows: t.rows, widths: Vec::new(), borderless: false }));
         }
     }
     if blocks.is_empty() {
diff --git a/crates/formats/src/rtf.rs b/crates/formats/src/rtf.rs
index ebe033ee5e..e8aebf09f9 100644
--- a/crates/formats/src/rtf.rs
+++ b/crates/formats/src/rtf.rs
@@ -850,7 +850,7 @@ impl Reader {
         }
         if !self.table.is_empty() {
             let rows = std::mem::take(&mut self.table);
-            self.body.push(FBlock::Table(FTable { rows, widths: Vec::new() }));
+            self.body.push(FBlock::Table(FTable { rows, widths: Vec::new(), borderless: false }));
         }
     }