diff --git a/PROJECT_STATE.md b/PROJECT_STATE.md
index f60d23d..7348b98 100644
--- a/PROJECT_STATE.md
+++ b/PROJECT_STATE.md
@@ -1,3 +1,19 @@
+## v3.0.0 selected portal invoice downloads - 2026-05-29 UTC
+
+- Added invoice selection checkboxes to the client portal dashboard.
+- Added a select-all checkbox in the portal invoice table header.
+- Converted portal invoice ZIP download from all-only GET behavior to GET/POST behavior.
+- Clicking “Download All Invoices” with no invoices selected still downloads all portal invoices.
+- Clicking “Download All Invoices” with checked invoices downloads only the selected invoices.
+- Selected downloads use `selected_invoices.zip`; full downloads continue using `all_invoices.zip`.
+- Auto-refresh now pauses when one or more invoice checkboxes are selected so the page does not reload during selection.
+- Existing portal invoice authorization is preserved: downloads are restricted to the logged-in client’s own invoices.
+
+Verified:
+- No selected invoices downloads all invoices.
+- Selected invoices download only those invoice PDFs.
+- Header checkbox selects/deselects visible invoices.
+
 ## v2.0.9 portal account-credit payments - 2026-05-29 UTC
 
 - Added portal “Use available credit” payment option for unpaid CAD invoices.
diff --git a/README.md b/README.md
index 264270d..8e8469c 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,19 @@
+## v3.0.0 selected portal invoice downloads - 2026-05-29 UTC
+
+- Added invoice selection checkboxes to the client portal dashboard.
+- Added a select-all checkbox in the portal invoice table header.
+- Converted portal invoice ZIP download from all-only GET behavior to GET/POST behavior.
+- Clicking “Download All Invoices” with no invoices selected still downloads all portal invoices.
+- Clicking “Download All Invoices” with checked invoices downloads only the selected invoices.
+- Selected downloads use `selected_invoices.zip`; full downloads continue using `all_invoices.zip`.
+- Auto-refresh now pauses when one or more invoice checkboxes are selected so the page does not reload during selection.
+- Existing portal invoice authorization is preserved: downloads are restricted to the logged-in client’s own invoices.
+
+Verified:
+- No selected invoices downloads all invoices.
+- Selected invoices download only those invoice PDFs.
+- Header checkbox selects/deselects visible invoices.
+
 ## v2.0.9 portal account-credit payments - 2026-05-29 UTC
 
 - Added portal “Use available credit” payment option for unpaid CAD invoices.
diff --git a/VERSION b/VERSION
index c03bb3d..ad55eb8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-v2.0.9
+v3.0.0
diff --git a/backend/app.py b/backend/app.py
index 92b02e1..aeec769 100644
--- a/backend/app.py
+++ b/backend/app.py
@@ -5463,7 +5463,7 @@ def portal_set_password():
 
 
 
-@app.route("/portal/invoices/download-all")
+@app.route("/portal/invoices/download-all", methods=["GET", "POST"])
 def portal_download_all_invoices():
     import io
     import zipfile
@@ -5471,19 +5471,44 @@ def portal_download_all_invoices():
     client = _portal_current_client()
     if not client:
         return redirect("/portal")
+    if portal_terms_required(client):
+        return redirect("/portal/terms")
+
+    selected_ids = []
+    if request.method == "POST":
+        for raw_id in request.form.getlist("invoice_ids"):
+            raw_id = str(raw_id or "").strip()
+            if raw_id.isdigit():
+                selected_ids.append(int(raw_id))
 
     conn = get_db_connection()
     cursor = conn.cursor(dictionary=True)
 
-    cursor.execute("""
-        SELECT id, invoice_number
-        FROM invoices
-        WHERE client_id = %s
-        ORDER BY id
-    """, (client["id"],))
+    if selected_ids:
+        placeholders = ",".join(["%s"] * len(selected_ids))
+        cursor.execute(f"""
+            SELECT id, invoice_number
+            FROM invoices
+            WHERE client_id = %s
+              AND id IN ({placeholders})
+            ORDER BY id
+        """, tuple([client["id"]] + selected_ids))
+        zip_name = "selected_invoices.zip"
+    else:
+        cursor.execute("""
+            SELECT id, invoice_number
+            FROM invoices
+            WHERE client_id = %s
+            ORDER BY id
+        """, (client["id"],))
+        zip_name = "all_invoices.zip"
+
     invoices = cursor.fetchall()
     conn.close()
 
+    if not invoices:
+        return redirect("/portal/dashboard")
+
     memory_file = io.BytesIO()
 
     with zipfile.ZipFile(memory_file, "w", zipfile.ZIP_DEFLATED) as zf:
@@ -5499,7 +5524,7 @@ def portal_download_all_invoices():
 
     return send_file(
         memory_file,
-        download_name="all_invoices.zip",
+        download_name=zip_name,
         as_attachment=True,
         mimetype="application/zip",
     )
diff --git a/templates/portal_dashboard.html b/templates/portal_dashboard.html
index aeecda5..e7760bf 100644
--- a/templates/portal_dashboard.html
+++ b/templates/portal_dashboard.html
@@ -3,6 +3,7 @@
 {% block title %}Client Dashboard - OutsideTheBox{% endblock %}
 
 {% block portal_content %}
+<form id="portal-invoice-download-form" method="post" action="/portal/invoices/download-all">
 <div class="portal-page-header">
   <div>
     <h1 class="portal-page-title">Client Dashboard</h1>
@@ -13,7 +14,7 @@
   <div class="portal-toolbar" style="display:flex;flex-direction:column;align-items:flex-end;gap:10px;">
     <div style="display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap;">
       <a class="portal-btn primary" href="/portal/services">Services Here</a>
-      <a class="portal-btn primary" href="/portal/invoices/download-all">Download All Invoices</a>
+      <button type="submit" class="portal-btn primary" style="border:0;cursor:pointer;">Download All Invoices</button>
       <a class="portal-btn" href="mailto:support@outsidethebox.top?subject=Customer%20Support">Customer Support</a>
       <a class="portal-btn" href="/portal/logout">Logout</a>
     </div>
@@ -56,6 +57,7 @@
   <table class="portal-table">
     <thead>
       <tr>
+        <th style="width:44px;"><input type="checkbox" id="select-all-invoices" aria-label="Select all invoices"></th>
         <th>Invoice</th>
         <th>Status</th>
         <th>Created</th>
@@ -67,6 +69,9 @@
     <tbody>
       {% for row in invoices %}
       <tr>
+        <td>
+          <input type="checkbox" class="invoice-select" name="invoice_ids" value="{{ row.id }}" aria-label="Select invoice {{ row.invoice_number or row.id }}">
+        </td>
         <td>
           <a class="invoice-link" href="/portal/invoice/{{ row.id }}">
             {{ row.invoice_number or ("INV-" ~ row.id) }}
@@ -96,18 +101,49 @@
       </tr>
       {% else %}
       <tr>
-        <td colspan="6">No invoices available.</td>
+        <td colspan="7">No invoices available.</td>
       </tr>
       {% endfor %}
     </tbody>
   </table>
 </div>
+</form>
 {% endblock %}
 
 {% block scripts %}
 <script>
 (function() {
-  setTimeout(function() { window.location.reload(); }, 20000);
+  const selectAll = document.getElementById("select-all-invoices");
+  const invoiceChecks = Array.from(document.querySelectorAll(".invoice-select"));
+
+  function anyChecked() {
+    return invoiceChecks.some(function(cb) { return cb.checked; });
+  }
+
+  if (selectAll) {
+    selectAll.addEventListener("change", function() {
+      invoiceChecks.forEach(function(cb) {
+        cb.checked = selectAll.checked;
+      });
+    });
+  }
+
+  invoiceChecks.forEach(function(cb) {
+    cb.addEventListener("change", function() {
+      if (!selectAll) {
+        return;
+      }
+      const checkedCount = invoiceChecks.filter(function(x) { return x.checked; }).length;
+      selectAll.checked = checkedCount === invoiceChecks.length && invoiceChecks.length > 0;
+      selectAll.indeterminate = checkedCount > 0 && checkedCount < invoiceChecks.length;
+    });
+  });
+
+  setTimeout(function() {
+    if (!anyChecked()) {
+      window.location.reload();
+    }
+  }, 20000);
 })();
 </script>
 {% endblock %}