diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 5d8fccb..4a8295d 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -4,11 +4,10 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="b30e2810-c4c1-4aad-b134-794e52cc1c7d" name="Changes" comment="chore: add array key">
+    <list default="true" id="b30e2810-c4c1-4aad-b134-794e52cc1c7d" name="Changes" comment="fix:">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/components/Hero.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/src/components/Hero.tsx" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/pages/tools-by-category/index.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/tools-by-category/index.tsx" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/utils/string.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/utils/string.ts" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/pages/tools/time/crontab-guru/index.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/tools/time/crontab-guru/index.tsx" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/pages/tools/time/crontab-guru/meta.ts" beforeDir="false" afterPath="$PROJECT_DIR$/src/pages/tools/time/crontab-guru/meta.ts" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -41,178 +40,178 @@
     &quot;state&quot;: &quot;OPEN&quot;
   }
 }</component>
-  <component name="GitHubPullRequestState"><![CDATA[{
-  "prStates": [
+  <component name="GitHubPullRequestState">{
+  &quot;prStates&quot;: [
     {
-      "id": {
-        "id": "PR_kwDOMJIfts51PkS9",
-        "number": 22
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts51PkS9&quot;,
+        &quot;number&quot;: 22
       },
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+      &quot;lastSeen&quot;: 1741207144695
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-      "id": {
-        "id": "PR_kwDOMJIfts6NiNYl",
-        "number": 32
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6NiNYl&quot;,
+        &quot;number&quot;: 32
       },
-      "lastSeen": 1741209723869
+      &quot;lastSeen&quot;: 1741209723869
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6Nheyd",
-        "number": 31
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6Nheyd&quot;,
+        &quot;number&quot;: 31
       },
-      "lastSeen": 1741213371410
+      &quot;lastSeen&quot;: 1741213371410
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6NmRBs",
-        "number": 33
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6NmRBs&quot;,
+        &quot;number&quot;: 33
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+      &quot;lastSeen&quot;: 1741282429036
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-      "id": {
-        "id": "PR_kwDOMJIfts5zyFTs",
-        "number": 15
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts5zyFTs&quot;,
+        &quot;number&quot;: 15
       },
-      "lastSeen": 1741535540953
+      &quot;lastSeen&quot;: 1741535540953
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6QQB3c",
-        "number": 59
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6QQB3c&quot;,
+        &quot;number&quot;: 59
       },
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+      &quot;lastSeen&quot;: 1743018960900
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     {
-      "id": {
-        "id": "PR_kwDOMJIfts6QMPEg",
-        "number": 58
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6QMPEg&quot;,
+        &quot;number&quot;: 58
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+      &quot;lastSeen&quot;: 1743019452983
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-      "id": {
-        "id": "PR_kwDOMJIfts6QZvRI",
-        "number": 61
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6QZvRI&quot;,
+        &quot;number&quot;: 61
       },
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+      &quot;lastSeen&quot;: 1743103196866
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-        "id": "PR_kwDOMJIfts6QqPrQ",
-        "number": 73
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6QqPrQ&quot;,
+        &quot;number&quot;: 73
       },
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+      &quot;lastSeen&quot;: 1743265865001
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6Qp5nI",
-        "number": 72
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6Qp5nI&quot;,
+        &quot;number&quot;: 72
       },
-      "lastSeen": 1743338472110
+      &quot;lastSeen&quot;: 1743338472110
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6QsjlS",
-        "number": 76
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6QsjlS&quot;,
+        &quot;number&quot;: 76
       },
-      "lastSeen": 1743352150953
+      &quot;lastSeen&quot;: 1743352150953
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     {
-      "id": {
-        "id": "PR_kwDOMJIfts6Q0JBe",
-        "number": 82
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6Q0JBe&quot;,
+        &quot;number&quot;: 82
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+      &quot;lastSeen&quot;: 1743470267269
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-      "id": {
-        "id": "PR_kwDOMJIfts6UE9-x",
-        "number": 102
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6UE9-x&quot;,
+        &quot;number&quot;: 102
       },
-      "lastSeen": 1747171977348
+      &quot;lastSeen&quot;: 1747171977348
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6XPua_",
-        "number": 117
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6XPua_&quot;,
+        &quot;number&quot;: 117
       },
-      "lastSeen": 1747929835864
+      &quot;lastSeen&quot;: 1747929835864
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6XY-mZ",
-        "number": 119
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6XY-mZ&quot;,
+        &quot;number&quot;: 119
       },
-      "lastSeen": 1748028108508
+      &quot;lastSeen&quot;: 1748028108508
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6Xdz4n",
-        "number": 120
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6Xdz4n&quot;,
+        &quot;number&quot;: 120
       },
-      "lastSeen": 1748282672214
+      &quot;lastSeen&quot;: 1748282672214
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6X_zxl",
-        "number": 131
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6X_zxl&quot;,
+        &quot;number&quot;: 131
       },
-      "lastSeen": 1748881279494
+      &quot;lastSeen&quot;: 1748881279494
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6bhieT",
-        "number": 152
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6bhieT&quot;,
+        &quot;number&quot;: 152
       },
-      "lastSeen": 1751848489082
+      &quot;lastSeen&quot;: 1751848489082
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6dOyRk",
-        "number": 154
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6dOyRk&quot;,
+        &quot;number&quot;: 154
       },
-      "lastSeen": 1751849436454
+      &quot;lastSeen&quot;: 1751849436454
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6cHjNi",
-        "number": 153
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6cHjNi&quot;,
+        &quot;number&quot;: 153
       },
-      "lastSeen": 1751849501498
+      &quot;lastSeen&quot;: 1751849501498
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6Zs1FN",
-        "number": 145
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6Zs1FN&quot;,
+        &quot;number&quot;: 145
       },
-      "lastSeen": 1751849770308
+      &quot;lastSeen&quot;: 1751849770308
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6bgKi9",
-        "number": 150
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6bgKi9&quot;,
+        &quot;number&quot;: 150
       },
-      "lastSeen": 1751850367300
+      &quot;lastSeen&quot;: 1751850367300
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6dv21R",
-        "number": 162
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6dv21R&quot;,
+        &quot;number&quot;: 162
       },
-      "lastSeen": 1751893739514
+      &quot;lastSeen&quot;: 1751893739514
     },
     {
-      "id": {
-        "id": "PR_kwDOMJIfts6dwQJi",
-        "number": 163
+      &quot;id&quot;: {
+        &quot;id&quot;: &quot;PR_kwDOMJIfts6dwQJi&quot;,
+        &quot;number&quot;: 163
       },
-      "lastSeen": 1751893861615
+      &quot;lastSeen&quot;: 1751893861615
     }
   ]
-}]]></component>
+}</component>
   <component name="GithubPullRequestsUISettings">{
   &quot;selectedUrlAndAccountId&quot;: {
     &quot;url&quot;: &quot;https://github.com/iib0011/omni-tools.git&quot;,
@@ -244,56 +243,56 @@
     <option name="hideEmptyMiddlePackages" value="true" />
     <option name="showLibraryContents" value="true" />
   </component>
-  <component name="PropertiesComponent"><![CDATA[{
-  "keyToString": {
-    "ASKED_ADD_EXTERNAL_FILES": "true",
-    "ASKED_SHARE_PROJECT_CONFIGURATION_FILES": "true",
-    "Docker.Dockerfile build.executor": "Run",
-    "Docker.Dockerfile.executor": "Run",
-    "Playwright.Create transparent PNG.should make png color transparent.executor": "Run",
-    "Playwright.JoinText Component.executor": "Run",
-    "Playwright.JoinText Component.should merge text pieces with specified join character.executor": "Run",
-    "RunOnceActivity.OpenProjectViewOnStart": "true",
-    "RunOnceActivity.ShowReadmeOnStart": "true",
-    "RunOnceActivity.git.unshallow": "true",
-    "Vitest.compute function (1).executor": "Run",
-    "Vitest.compute function.executor": "Run",
-    "Vitest.mergeText.executor": "Run",
-    "Vitest.mergeText.should merge lines and preserve blank lines when deleteBlankLines is false.executor": "Run",
-    "Vitest.mergeText.should merge lines, preserve blank lines and trailing spaces when both deleteBlankLines and deleteTrailingSpaces are false.executor": "Run",
-    "Vitest.parsePageRanges.executor": "Run",
-    "Vitest.removeDuplicateLines function.executor": "Run",
-    "Vitest.removeDuplicateLines function.newlines option.executor": "Run",
-    "Vitest.removeDuplicateLines function.newlines option.should filter newlines when newlines is set to filter.executor": "Run",
-    "Vitest.replaceText function (regexp mode).should return the original text when passed an invalid regexp.executor": "Run",
-    "Vitest.replaceText function.executor": "Run",
-    "Vitest.timeBetweenDates.executor": "Run",
-    "git-widget-placeholder": "#163 on fork/y1hao/grouping",
-    "ignore.virus.scanning.warn.message": "true",
-    "kotlin-language-version-configured": "true",
-    "last_opened_file_path": "C:/Users/Ibrahima/IdeaProjects/omni-tools/src/pages/tools/json",
-    "node.js.detected.package.eslint": "true",
-    "node.js.detected.package.tslint": "true",
-    "node.js.selected.package.eslint": "(autodetect)",
-    "node.js.selected.package.tslint": "(autodetect)",
-    "nodejs_package_manager_path": "npm",
-    "npm.build.executor": "Run",
-    "npm.dev.executor": "Run",
-    "npm.lint.executor": "Run",
-    "npm.prebuild.executor": "Run",
-    "npm.script:create:tool.executor": "Run",
-    "npm.test.executor": "Run",
-    "npm.test:e2e.executor": "Run",
-    "npm.test:e2e:run.executor": "Run",
-    "prettierjs.PrettierConfiguration.Package": "C:\\Users\\Ibrahima\\IdeaProjects\\omni-tools\\node_modules\\prettier",
-    "project.structure.last.edited": "Problems",
-    "project.structure.proportion": "0.0",
-    "project.structure.side.proportion": "0.2",
-    "settings.editor.selected.configurable": "refactai_advanced_settings",
-    "ts.external.directory.path": "C:\\Users\\Ibrahima\\IdeaProjects\\omni-tools\\node_modules\\typescript\\lib",
-    "vue.rearranger.settings.migration": "true"
+  <component name="PropertiesComponent">{
+  &quot;keyToString&quot;: {
+    &quot;ASKED_ADD_EXTERNAL_FILES&quot;: &quot;true&quot;,
+    &quot;ASKED_SHARE_PROJECT_CONFIGURATION_FILES&quot;: &quot;true&quot;,
+    &quot;Docker.Dockerfile build.executor&quot;: &quot;Run&quot;,
+    &quot;Docker.Dockerfile.executor&quot;: &quot;Run&quot;,
+    &quot;Playwright.Create transparent PNG.should make png color transparent.executor&quot;: &quot;Run&quot;,
+    &quot;Playwright.JoinText Component.executor&quot;: &quot;Run&quot;,
+    &quot;Playwright.JoinText Component.should merge text pieces with specified join character.executor&quot;: &quot;Run&quot;,
+    &quot;RunOnceActivity.OpenProjectViewOnStart&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.ShowReadmeOnStart&quot;: &quot;true&quot;,
+    &quot;RunOnceActivity.git.unshallow&quot;: &quot;true&quot;,
+    &quot;Vitest.compute function (1).executor&quot;: &quot;Run&quot;,
+    &quot;Vitest.compute function.executor&quot;: &quot;Run&quot;,
+    &quot;Vitest.mergeText.executor&quot;: &quot;Run&quot;,
+    &quot;Vitest.mergeText.should merge lines and preserve blank lines when deleteBlankLines is false.executor&quot;: &quot;Run&quot;,
+    &quot;Vitest.mergeText.should merge lines, preserve blank lines and trailing spaces when both deleteBlankLines and deleteTrailingSpaces are false.executor&quot;: &quot;Run&quot;,
+    &quot;Vitest.parsePageRanges.executor&quot;: &quot;Run&quot;,
+    &quot;Vitest.removeDuplicateLines function.executor&quot;: &quot;Run&quot;,
+    &quot;Vitest.removeDuplicateLines function.newlines option.executor&quot;: &quot;Run&quot;,
+    &quot;Vitest.removeDuplicateLines function.newlines option.should filter newlines when newlines is set to filter.executor&quot;: &quot;Run&quot;,
+    &quot;Vitest.replaceText function (regexp mode).should return the original text when passed an invalid regexp.executor&quot;: &quot;Run&quot;,
+    &quot;Vitest.replaceText function.executor&quot;: &quot;Run&quot;,
+    &quot;Vitest.timeBetweenDates.executor&quot;: &quot;Run&quot;,
+    &quot;git-widget-placeholder&quot;: &quot;#167 on fork/AshAnand34/crontab-guru-tool&quot;,
+    &quot;ignore.virus.scanning.warn.message&quot;: &quot;true&quot;,
+    &quot;kotlin-language-version-configured&quot;: &quot;true&quot;,
+    &quot;last_opened_file_path&quot;: &quot;C:/Users/Ibrahima/IdeaProjects/omni-tools/src/pages/tools/json&quot;,
+    &quot;node.js.detected.package.eslint&quot;: &quot;true&quot;,
+    &quot;node.js.detected.package.tslint&quot;: &quot;true&quot;,
+    &quot;node.js.selected.package.eslint&quot;: &quot;(autodetect)&quot;,
+    &quot;node.js.selected.package.tslint&quot;: &quot;(autodetect)&quot;,
+    &quot;nodejs_package_manager_path&quot;: &quot;npm&quot;,
+    &quot;npm.build.executor&quot;: &quot;Run&quot;,
+    &quot;npm.dev.executor&quot;: &quot;Run&quot;,
+    &quot;npm.lint.executor&quot;: &quot;Run&quot;,
+    &quot;npm.prebuild.executor&quot;: &quot;Run&quot;,
+    &quot;npm.script:create:tool.executor&quot;: &quot;Run&quot;,
+    &quot;npm.test.executor&quot;: &quot;Run&quot;,
+    &quot;npm.test:e2e.executor&quot;: &quot;Run&quot;,
+    &quot;npm.test:e2e:run.executor&quot;: &quot;Run&quot;,
+    &quot;prettierjs.PrettierConfiguration.Package&quot;: &quot;C:\\Users\\Ibrahima\\IdeaProjects\\omni-tools\\node_modules\\prettier&quot;,
+    &quot;project.structure.last.edited&quot;: &quot;Problems&quot;,
+    &quot;project.structure.proportion&quot;: &quot;0.0&quot;,
+    &quot;project.structure.side.proportion&quot;: &quot;0.2&quot;,
+    &quot;settings.editor.selected.configurable&quot;: &quot;refactai_advanced_settings&quot;,
+    &quot;ts.external.directory.path&quot;: &quot;C:\\Users\\Ibrahima\\IdeaProjects\\omni-tools\\node_modules\\typescript\\lib&quot;,
+    &quot;vue.rearranger.settings.migration&quot;: &quot;true&quot;
   }
-}]]></component>
+}</component>
   <component name="ReactDesignerToolWindowState">
     <option name="myId2Visible">
       <map>
diff --git a/package-lock.json b/package-lock.json
index 173cc4e..5cefa39 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -26,6 +26,8 @@
         "browser-image-compression": "^2.0.2",
         "buffer": "^6.0.3",
         "color": "^4.2.3",
+        "cron-validator": "^1.3.1",
+        "cronstrue": "^3.0.0",
         "dayjs": "^1.11.13",
         "formik": "^2.4.6",
         "jimp": "^0.22.12",
@@ -4819,6 +4821,21 @@
         "node": ">= 6"
       }
     },
+    "node_modules/cron-validator": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/cron-validator/-/cron-validator-1.3.1.tgz",
+      "integrity": "sha512-C1HsxuPCY/5opR55G5/WNzyEGDWFVG+6GLrA+fW/sCTcP6A6NTjUP2AK7B8n2PyFs90kDG2qzwm8LMheADku6A==",
+      "license": "MIT"
+    },
+    "node_modules/cronstrue": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/cronstrue/-/cronstrue-3.0.0.tgz",
+      "integrity": "sha512-acwNTPzndJUmfDmcUN2cpBH4EgVn30rg5BYDAP8n5ENPP8A3IH2Z0UbxaNjvCkKxccjtfsTVhF6d+eHhv/GK5g==",
+      "license": "MIT",
+      "bin": {
+        "cronstrue": "bin/cli.js"
+      }
+    },
     "node_modules/cross-spawn": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
diff --git a/package.json b/package.json
index ed7ebcf..86276e5 100644
--- a/package.json
+++ b/package.json
@@ -43,6 +43,8 @@
     "browser-image-compression": "^2.0.2",
     "buffer": "^6.0.3",
     "color": "^4.2.3",
+    "cron-validator": "^1.3.1",
+    "cronstrue": "^3.0.0",
     "dayjs": "^1.11.13",
     "formik": "^2.4.6",
     "jimp": "^0.22.12",
diff --git a/src/components/result/ValidatedToolResult.tsx b/src/components/result/ValidatedToolResult.tsx
new file mode 100644
index 0000000..c1a0b86
--- /dev/null
+++ b/src/components/result/ValidatedToolResult.tsx
@@ -0,0 +1,60 @@
+import React from 'react';
+import { Alert } from '@mui/material';
+
+interface ValidatedToolResultProps {
+  isValid: boolean | null;
+  hasInteracted: boolean;
+  errorMessage?: string;
+  children: React.ReactNode;
+}
+
+const ValidatedToolResult: React.FC<ValidatedToolResultProps> = ({
+  isValid,
+  hasInteracted,
+  errorMessage = 'Invalid input.',
+  children
+}) => (
+  <div style={{ position: 'relative', minHeight: 80 }}>
+    {hasInteracted && isValid === false && (
+      <div
+        style={{
+          position: 'absolute',
+          top: 0,
+          left: 0,
+          width: '100%',
+          height: '100%',
+          zIndex: 2,
+          pointerEvents: 'auto',
+          display: 'flex',
+          alignItems: 'center',
+          justifyContent: 'center',
+          background: 'transparent'
+        }}
+      >
+        <Alert
+          severity="error"
+          style={{
+            width: '80%',
+            opacity: 0.85,
+            textAlign: 'center',
+            pointerEvents: 'none'
+          }}
+        >
+          {errorMessage}
+        </Alert>
+      </div>
+    )}
+    <div
+      style={{
+        filter: hasInteracted && isValid === false ? 'blur(1px)' : 'none',
+        transition: 'filter 0.2s'
+      }}
+    >
+      {hasInteracted && isValid === false
+        ? React.cloneElement(children as React.ReactElement, { value: '' })
+        : children}
+    </div>
+  </div>
+);
+
+export default ValidatedToolResult;
diff --git a/src/pages/tools/time/crontab-guru/crontab-guru.service.test.ts b/src/pages/tools/time/crontab-guru/crontab-guru.service.test.ts
new file mode 100644
index 0000000..bce7fd9
--- /dev/null
+++ b/src/pages/tools/time/crontab-guru/crontab-guru.service.test.ts
@@ -0,0 +1,26 @@
+import { expect, describe, it } from 'vitest';
+import { validateCrontab, explainCrontab } from './service';
+
+describe('crontab-guru service', () => {
+  it('validates correct crontab expressions', () => {
+    expect(validateCrontab('35 16 * * 0-5')).toBe(true);
+    expect(validateCrontab('* * * * *')).toBe(true);
+    expect(validateCrontab('0 12 1 * *')).toBe(true);
+  });
+
+  it('invalidates incorrect crontab expressions', () => {
+    expect(validateCrontab('invalid expression')).toBe(false);
+    expect(validateCrontab('61 24 * * *')).toBe(false);
+  });
+
+  it('explains valid crontab expressions', () => {
+    expect(explainCrontab('35 16 * * 0-5')).toMatch(/At 04:35 PM/);
+    expect(explainCrontab('* * * * *')).toMatch(/Every minute/);
+  });
+
+  it('returns error for invalid crontab explanation', () => {
+    expect(explainCrontab('invalid expression')).toMatch(
+      /Invalid crontab expression/
+    );
+  });
+});
diff --git a/src/pages/tools/time/crontab-guru/index.tsx b/src/pages/tools/time/crontab-guru/index.tsx
new file mode 100644
index 0000000..11246e7
--- /dev/null
+++ b/src/pages/tools/time/crontab-guru/index.tsx
@@ -0,0 +1,128 @@
+import { Alert } from '@mui/material';
+import React, { useState } from 'react';
+import ToolContent from '@components/ToolContent';
+import { ToolComponentProps } from '@tools/defineTool';
+import ToolTextInput from '@components/input/ToolTextInput';
+import ToolTextResult from '@components/result/ToolTextResult';
+import { CardExampleType } from '@components/examples/ToolExamples';
+import { main, validateCrontab } from './service';
+
+const initialValues = {};
+
+type InitialValuesType = typeof initialValues;
+
+const exampleCards: CardExampleType<InitialValuesType>[] = [
+  {
+    title: 'Every day at 16:35, Sunday to Friday',
+    description: 'At 16:35 on every day-of-week from Sunday through Friday.',
+    sampleText: '35 16 * * 0-5',
+    sampleResult: 'At 04:35 PM, Sunday through Friday',
+    sampleOptions: {}
+  },
+  {
+    title: 'Every minute',
+    description: 'Runs every minute.',
+    sampleText: '* * * * *',
+    sampleResult: 'Every minute',
+    sampleOptions: {}
+  },
+  {
+    title: 'Every 5 minutes',
+    description: 'Runs every 5 minutes.',
+    sampleText: '*/5 * * * *',
+    sampleResult: 'Every 5 minutes',
+    sampleOptions: {}
+  },
+  {
+    title: 'At 12:00 PM on the 1st of every month',
+    description: 'Runs at noon on the first day of each month.',
+    sampleText: '0 12 1 * *',
+    sampleResult: 'At 12:00 PM, on day 1 of the month',
+    sampleOptions: {}
+  }
+];
+
+export default function CrontabGuru({
+  title,
+  longDescription
+}: ToolComponentProps) {
+  const [input, setInput] = useState<string>('');
+  const [result, setResult] = useState<string>('');
+  const [isValid, setIsValid] = useState<boolean | null>(null);
+  const [hasInteracted, setHasInteracted] = useState<boolean>(false);
+
+  const compute = (values: InitialValuesType, input: string) => {
+    if (hasInteracted) {
+      setIsValid(validateCrontab(input));
+    }
+    setResult(main(input, values));
+  };
+
+  const handleInputChange = (val: string) => {
+    if (!hasInteracted) setHasInteracted(true);
+    setInput(val);
+  };
+
+  return (
+    <ToolContent
+      title={title}
+      input={input}
+      inputComponent={
+        <ToolTextInput
+          value={input}
+          onChange={handleInputChange}
+          placeholder="e.g. 35 16 * * 0-5"
+        />
+      }
+      resultComponent={
+        <div style={{ position: 'relative', minHeight: 80 }}>
+          {hasInteracted && isValid === false && (
+            <div
+              style={{
+                position: 'absolute',
+                top: 0,
+                left: 0,
+                width: '100%',
+                height: '100%',
+                zIndex: 2,
+                pointerEvents: 'auto',
+                display: 'flex',
+                alignItems: 'center',
+                justifyContent: 'center',
+                background: 'transparent'
+              }}
+            >
+              <Alert
+                severity="error"
+                style={{
+                  width: '80%',
+                  opacity: 0.85,
+                  textAlign: 'center',
+                  pointerEvents: 'none'
+                }}
+              >
+                Invalid crontab expression.
+              </Alert>
+            </div>
+          )}
+          <div
+            style={{
+              filter: hasInteracted && isValid === false ? 'blur(1px)' : 'none',
+              transition: 'filter 0.2s'
+            }}
+          >
+            <ToolTextResult
+              value={hasInteracted && isValid === false ? '' : result}
+            />
+          </div>
+        </div>
+      }
+      initialValues={initialValues}
+      exampleCards={exampleCards}
+      getGroups={null}
+      setInput={setInput}
+      compute={compute}
+      toolInfo={{ title: `What is a ${title}?`, description: longDescription }}
+    />
+  );
+}
diff --git a/src/pages/tools/time/crontab-guru/meta.ts b/src/pages/tools/time/crontab-guru/meta.ts
new file mode 100644
index 0000000..1ce0744
--- /dev/null
+++ b/src/pages/tools/time/crontab-guru/meta.ts
@@ -0,0 +1,24 @@
+import { defineTool } from '@tools/defineTool';
+import { lazy } from 'react';
+
+export const tool = defineTool('time', {
+  name: 'Crontab explainer',
+  path: 'crontab-guru',
+  icon: 'mdi:calendar-clock',
+  description:
+    'Parse, validate, and explain crontab expressions in plain English.',
+  shortDescription: 'Crontab expression parser and explainer',
+  keywords: [
+    'crontab',
+    'cron',
+    'schedule',
+    'guru',
+    'time',
+    'expression',
+    'parser',
+    'explain'
+  ],
+  longDescription:
+    'Enter a crontab expression (like "35 16 * * 0-5") to get a human-readable explanation and validation. Useful for understanding and debugging cron schedules. Inspired by crontab.guru.',
+  component: lazy(() => import('./index'))
+});
diff --git a/src/pages/tools/time/crontab-guru/service.ts b/src/pages/tools/time/crontab-guru/service.ts
new file mode 100644
index 0000000..638636c
--- /dev/null
+++ b/src/pages/tools/time/crontab-guru/service.ts
@@ -0,0 +1,22 @@
+import cronstrue from 'cronstrue';
+import { isValidCron } from 'cron-validator';
+
+export function explainCrontab(expr: string): string {
+  try {
+    return cronstrue.toString(expr);
+  } catch (e: any) {
+    return `Invalid crontab expression: ${e.message}`;
+  }
+}
+
+export function validateCrontab(expr: string): boolean {
+  return isValidCron(expr, { seconds: false, allowBlankDay: true });
+}
+
+export function main(input: string, _options: any): string {
+  if (!input.trim()) return '';
+  if (!validateCrontab(input)) {
+    return 'Invalid crontab expression.';
+  }
+  return explainCrontab(input);
+}
diff --git a/src/pages/tools/time/epoch-converter/index.tsx b/src/pages/tools/time/epoch-converter/index.tsx
index e9a5b34..c685fe1 100644
--- a/src/pages/tools/time/epoch-converter/index.tsx
+++ b/src/pages/tools/time/epoch-converter/index.tsx
@@ -7,6 +7,7 @@ import ToolTextResult from '@components/result/ToolTextResult';
 import { CardExampleType } from '@components/examples/ToolExamples';
 import { main } from './service';
 import { InitialValuesType } from './types';
+import ValidatedToolResult from '@components/result/ValidatedToolResult';
 
 const initialValues: InitialValuesType = {};
 
@@ -67,48 +68,13 @@ export default function EpochConverter({
         />
       }
       resultComponent={
-        <div style={{ position: 'relative', minHeight: 80 }}>
-          {hasInteracted && isValid === false && (
-            <div
-              style={{
-                position: 'absolute',
-                top: 0,
-                left: 0,
-                width: '100%',
-                height: '100%',
-                zIndex: 2,
-                pointerEvents: 'auto',
-                display: 'flex',
-                alignItems: 'center',
-                justifyContent: 'center',
-                background: 'transparent'
-              }}
-            >
-              <Alert
-                severity="error"
-                style={{
-                  width: '80%',
-                  opacity: 0.85,
-                  textAlign: 'center',
-                  pointerEvents: 'none'
-                }}
-              >
-                Invalid input. Please enter a valid epoch timestamp or date
-                string.
-              </Alert>
-            </div>
-          )}
-          <div
-            style={{
-              filter: hasInteracted && isValid === false ? 'blur(1px)' : 'none',
-              transition: 'filter 0.2s'
-            }}
-          >
-            <ToolTextResult
-              value={hasInteracted && isValid === false ? '' : result}
-            />
-          </div>
-        </div>
+        <ValidatedToolResult
+          isValid={isValid}
+          hasInteracted={hasInteracted}
+          errorMessage="Invalid input. Please enter a valid epoch timestamp or date string."
+        >
+          <ToolTextResult value={result} />
+        </ValidatedToolResult>
       }
       initialValues={initialValues}
       exampleCards={exampleCards}
diff --git a/src/pages/tools/time/index.ts b/src/pages/tools/time/index.ts
index 79c2cd4..8df601b 100644
--- a/src/pages/tools/time/index.ts
+++ b/src/pages/tools/time/index.ts
@@ -1,4 +1,5 @@
 import { tool as timeEpochConverter } from './epoch-converter/meta';
+import { tool as timeCrontabGuru } from './crontab-guru/meta';
 import { tool as timeBetweenDates } from './time-between-dates/meta';
 import { tool as daysDoHours } from './convert-days-to-hours/meta';
 import { tool as hoursToDays } from './convert-hours-to-days/meta';
@@ -13,5 +14,6 @@ export const timeTools = [
   convertTimetoSeconds,
   truncateClockTime,
   timeBetweenDates,
-  timeEpochConverter
+  timeEpochConverter,
+  timeCrontabGuru
 ];