diff --git a/pyproject.toml b/pyproject.toml
index d29eaa0c..562bf343 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,8 @@ dependencies = [
     "structlog>=25.4.0",
     "docling-serve==1.5.0",
     "docling-core==2.48.1",
-    "easyocr>=1.7.1; sys_platform != 'darwin'"
+    "easyocr>=1.7.1; sys_platform != 'darwin'",
+    "zxcvbn>=4.5.0"
 ]
 
 [dependency-groups]
diff --git a/src/tui/screens/config.py b/src/tui/screens/config.py
index 1cb03477..6852b480 100644
--- a/src/tui/screens/config.py
+++ b/src/tui/screens/config.py
@@ -1,6 +1,7 @@
 """Configuration screen for OpenRAG TUI."""
 
 import re
+from zxcvbn import zxcvbn
 from textual.app import ComposeResult
 from textual.containers import Container, Vertical, Horizontal, ScrollableContainer
 from textual.screen import Screen
@@ -98,35 +99,36 @@ class DocumentsPathValidator(Validator):
 
 
 class PasswordValidator(Validator):
-    """Validator for OpenSearch admin password."""
+    """Validator for OpenSearch admin password using zxcvbn strength estimation."""
+
+    # Minimum acceptable score (0-4 scale: 0=weak, 4=very strong)
+    MIN_SCORE = 3
 
     def validate(self, value: str) -> ValidationResult:
         # Allow empty value (will be auto-generated)
         if not value:
             return self.success()
 
-        # Minimum length: 8 characters
-        if len(value) < 8:
-            return self.failure("Password must be at least 8 characters long")
+        # Use zxcvbn to evaluate password strength
+        result = zxcvbn(value)
+        score = result["score"]
 
-        # Check for required character types
-        has_uppercase = bool(re.search(r"[A-Z]", value))
-        has_lowercase = bool(re.search(r"[a-z]", value))
-        has_digit = bool(re.search(r"[0-9]", value))
-        has_special = bool(re.search(r"[!@#$%^&*()_+\-=\[\]{};':\"\\|,.<>/?]", value))
+        if score < self.MIN_SCORE:
+            # Get feedback from zxcvbn
+            feedback = result.get("feedback", {})
+            warning = feedback.get("warning", "")
+            suggestions = feedback.get("suggestions", [])
 
-        missing = []
-        if not has_uppercase:
-            missing.append("uppercase letter")
-        if not has_lowercase:
-            missing.append("lowercase letter")
-        if not has_digit:
-            missing.append("digit")
-        if not has_special:
-            missing.append("special character")
+            # Build error message
+            strength_labels = ["very weak", "weak", "fair", "strong", "very strong"]
+            current_strength = strength_labels[score]
 
-        if missing:
-            return self.failure(f"Password must contain: {', '.join(missing)}")
+            if warning:
+                return self.failure(f"Password is {current_strength}: {warning}")
+            elif suggestions:
+                return self.failure(f"Password is {current_strength}. {suggestions[0]}")
+            else:
+                return self.failure(f"Password is {current_strength}. Use a longer, more unique password.")
 
         return self.success()
 
@@ -200,7 +202,7 @@ class ConfigScreen(Screen):
         # OpenSearch Admin Password
         yield Label("OpenSearch Admin Password *")
         yield Static(
-            "Min 8 chars with uppercase, lowercase, digit, and special character",
+            "Validate your password here: https://lowe.github.io/tryzxcvbn/",
             classes="helper-text",
         )
         current_value = getattr(self.env_manager.config, "opensearch_password", "")
diff --git a/uv.lock b/uv.lock
index 868950f3..b1aa2c8e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -2383,6 +2383,7 @@ dependencies = [
     { name = "torch", version = "2.7.1+cu128", source = { registry = "https://download.pytorch.org/whl/cu128" }, marker = "platform_machine == 'x86_64' and sys_platform == 'linux'" },
     { name = "torch", version = "2.8.0", source = { registry = "https://pypi.org/simple" }, marker = "platform_machine != 'x86_64' or sys_platform != 'linux'" },
     { name = "uvicorn" },
+    { name = "zxcvbn" },
 ]
 
 [package.dev-dependencies]
@@ -2422,6 +2423,7 @@ requires-dist = [
     { name = "torch", marker = "platform_machine != 'x86_64' or sys_platform != 'linux'", specifier = ">=2.7.1" },
     { name = "torch", marker = "platform_machine == 'x86_64' and sys_platform == 'linux'", specifier = ">=2.7.1", index = "https://download.pytorch.org/whl/cu128" },
     { name = "uvicorn", specifier = ">=0.35.0" },
+    { name = "zxcvbn", specifier = ">=4.5.0" },
 ]
 
 [package.metadata.requires-dev]
@@ -4173,3 +4175,12 @@ sdist = { url = "https://files.pythonhosted.org/packages/e3/02/0f2892c661036d50e
 wheels = [
     { url = "https://files.pythonhosted.org/packages/2e/54/647ade08bf0db230bfea292f893923872fd20be6ac6f53b2b936ba839d75/zipp-3.23.0-py3-none-any.whl", hash = "sha256:071652d6115ed432f5ce1d34c336c0adfd6a884660d1e9712a256d3d3bd4b14e", size = 10276, upload-time = "2025-06-08T17:06:38.034Z" },
 ]
+
+[[package]]
+name = "zxcvbn"
+version = "4.5.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/ae/40/9366940b1484fd4e9423c8decbbf34a73bf52badb36281e082fe02b57aca/zxcvbn-4.5.0.tar.gz", hash = "sha256:70392c0fff39459d7f55d0211151401e79e76fcc6e2c22b61add62900359c7c1", size = 411249, upload-time = "2025-02-19T19:03:02.699Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/c2/16/7410f8e714a109d43d17f4e27c8eabb351557653a9b570db1bd7dfdfd822/zxcvbn-4.5.0-py2.py3-none-any.whl", hash = "sha256:2b6eed621612ce6d65e6e4c7455b966acee87d0280e257956b1f06ccc66bd5ff", size = 409397, upload-time = "2025-02-19T19:03:00.521Z" },
+]