diff --git a/internal/web/web.go b/internal/web/web.go
index 08f84ce..e484073 100644
--- a/internal/web/web.go
+++ b/internal/web/web.go
@@ -245,13 +245,20 @@ func (h *Handlers) renderPaste(w http.ResponseWriter, row *store.PasteRow, justC
 	if lang == "" {
 		lang = "text"
 	}
-	summary := fmt.Sprintf("%s · %s · %d views · %s", lang, humanSize(len(row.Content)), row.ViewCount, agoString(row.CreatedAt))
 	// #38: one optional file attachment per paste; nil when none.
 	attachment, err := h.Store.GetAttachmentForPaste(row.ID)
 	if err != nil {
 		http.Error(w, "db error", 500)
 		return
 	}
+	// #221: for attachment pastes the stored text content is empty (the file
+	// replaced it), so the summary size must come from the attachment blob,
+	// not len(row.Content), or the summary shows "0 B".
+	summarySize := len(row.Content)
+	if attachment != nil {
+		summarySize = int(attachment.Size)
+	}
+	summary := fmt.Sprintf("%s · %s · %d views · %s", lang, humanSize(summarySize), row.ViewCount, agoString(row.CreatedAt))
 	// #221: image attachments render the image, not a text/code box. Size
 	// comes from the attachment's actual file size, not the text content.
 	attImage := false