Chrome Web Store
211Versions
1Code reviewed

No malware found

In code review (v14.1297.0)

Our reviewer read version 14.1297.0 — the most recent version we have reviewed — and found no malicious behaviour. The version shown here has not been individually reviewed yet.

What our analysis found

Grammarly: AI Writing Assistant and Grammar Checker App, used by 44,000,000 people, showed no malicious code in Extension Auditor's review. Its permissions mean it can inject scripts into pages. It comes from a trusted publisher and was last updated in October 2026.

Analyst notes

This is the legitimate Grammarly extension with 40M users, a Google-trusted-publisher badge, and an ML risk score of 0.00. All network destinations in the code ([domain withheld], [domain withheld], [domain withheld], [domain withheld], [domain withheld] for CRM, [domain withheld] for integration) are either first-party infrastructure or well-known SaaS platforms explicitly whitelisted in the extension's CSP. The high ML feature counts (js_fromcharcode:178, js_innerHTML:224, js_appendchild:372, total_js_size:35MB) are purely artifacts of a large Webpack+Terser bundle — none resolved to obfuscated payloads or unauthorized data sinks in source review. The single `new Function('return this')()` call is a standard global-context polyfill, and usages are for encoding alert state to storage — both are definitively benign. The bundled manifest matches the published manifest exactly with no permission discrepancies.

Grammarly: AI Writing Assistant and Grammar Checker App

Grammarly: AI Writing Assistant and Grammar Checker App Chrome extension security report

ID: kbfnbcaeplbcioakkpcpgfkobkghlhen

Supported Languages

🇺🇸English

Extension Info & Metadata

Status
Active
Version
14.1336.0
Size
17.27 MB
Rating
4.5/5
Reviews
42,944
Users
44,000,000
Type
Extension
Updated
Oct 7, 2026
Category
Productivity Communication
Price
Free
Featured
Yes
Visibility
Listed
Mature
No
By Google
No
Trusted
Yes
This publisherTrack record
2extensions
All still listed
Scanned by Extension Auditor — Low RiskDevelopers: embed this badge to link to this report.

Publisher Contextual Analysis

Trusted
Author
http://grammarly.com/
Country
US
MX records exist
Yes
Domain exists
Yes
Is disposable
No
Is role-based
Yes
Mailbox exists
Yes
Address
548 Market St Ste 35410 San Francisco, CA 94104-5401 US
Website
Visit
Extensions
2
Active
2
Obsolete
0
Listed
2
Unlisted
0
Users
44,000,101

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Screenshots & videos

Screenshot 1
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Screenshot 3
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Screenshot 5

Install growth

Item
Type
Severity
Description
scripting
Permission
Critical
This permission allows injection and execution of JavaScript on any webpage. Rated Critical because it can modify page content, steal sensitive data, and inject malicious code into any site the extension has access to.
http://*/*
Host
Critical
Broad host access — the extension can read/modify content on every website.
https://*/*
Host
Critical
Broad host access — the extension can read/modify content on every website.
cookies
Permission
High
This permission provides full access to read and modify browser cookies. Rated High because it can steal session tokens, modify authentication cookies, and compromise accounts across websites.
identity
Permission
High
This permission accesses Chrome identity service and user information. Rated High because it can obtain OAuth tokens, access connected accounts, and impersonate the user in authenticated service.
Contextual Risk Factors
Risk Factor
High
The following context increases the overall risk: • 10% increase: Early script execution enables pre-emptive content manipulation • 10% increase: About:blank access enables potential sandbox escape vectors
tabs
Permission
Medium
This permission enables tab management and monitoring. Rated Medium because it can track open tabs, access tab metadata, and monitor user browsing patterns.
storage
Permission
Medium
This permission allows storing data locally in the browser. Rated Medium because it can persist sensitive user data, track user activities over time, and potentially store malicious payloads.
Early Content Script Execution
Risk Factor
Medium
This extension runs content scripts at document_start.
About:blank Access
Risk Factor
Medium
This extension can run content scripts in about:blank pages.
sidePanel
Permission
Low
This permission adds custom panels to the browser interface. Rated Low because it only affects browser UI elements and cannot access page content.
notifications
Permission
Low
This permission displays system notifications. Rated Low because it can only show user-visible notifications without accessing system data.

About this extension

Grammarly for Chrome helps you write with confidence. Get AI support for grammar, clarity, and tone, from first draft to final edit.

Read the publisher’s full description

Grammarly for Chrome is your always-on AI partner for clearer, more compelling communication. From brainstorming ideas to final edits, Grammarly’s advanced AI helps you write faster and with more confidence. It works across everything you write, whether it’s an email, a school paper, or a business proposal. Advanced AI support you can count on: • Generate one-click drafts to help you start faster • Build outlines to organize ideas clearly • Rewrite sentences for flow, clarity, and engagement • Adjust tone and word choice for any audience • Check originality with built-in plagiarism detection and AI content safeguards And now, with Superhuman Go, you can go beyond writing. Go works alongside you in Chrome to streamline tasks and minimize interruptions—combining Grammarly’s trusted AI writing support with tools that help you stay focused and productive. Currently available as an opt-in beta, Go can be enabled directly from your Chrome extension settings. ➤ How it works Grammarly integrates directly into your browser, offering real-time suggestions as you type in Gmail, Google Docs, LinkedIn, and across 500,000+ other sites. • See corrections and improvements instantly • Expand edits to learn the “why” and strengthen your skills • Stay focused with Go, the AI assistant that understands what you’re working on and offers proactive support ➤ What’s included? Free – Essential tools for confident writing: • Grammar, spelling, and punctuation corrections • Suggestions to improve clarity and tone • Auto-citations in APA, MLA, and Chicago style • AI help to brainstorm, draft, and rewrite Pro – Everything in Free, plus: • Sentence rewrites for clarity, flow, and engagement • Tone, formality, and word choice enhancements • Audience insights to guide how your message is received • Feedback tailored for academic, technical, or professional work • Plagiarism detection and AI content checks • Team features like style guides and tone profiles (for business users) ➤ Trusted by millions “Grammarly rightfully touts itself as more than a simple spell checker ... Grammarly has a generative AI tool that helps you build outlines, brainstorm ideas, and even generate text.” —CNET “Grammarly’s advanced AI suggestions go beyond simply flagging grammatical mistakes to offer intelligent suggestions for improving clarity, tone, and conciseness for whatever you’re writing.” —Tom’s Guide “The beauty of this tool is that it uses AI to exemplify how your work can be enhanced rather than doing it for you.” —ZDNet ➤ More ways to use Grammarly • Desktop app: Use Grammarly in Word, Outlook, Slack, and more by downloading Grammarly on your desktop → www.grammarly.com/desktop • Docs: Grammarly’s dedicated writing space for deep focus and strategic insights → www.grammarly.com/docs ➤ Privacy and security you can trust Your data privacy and security are at the core of everything we do. Learn more about our user-first approach to trust and safety: www.grammarly.com/trust California residents, please see the California Privacy Notice: https://www.grammarly.com/privacy-policy#sectionSingleColumn_47y4NWiOf89wt12wcc6a74 By installing the extension, you agree to and acknowledge: www.grammarly.com/terms www.grammarly.com/privacy-policy

User reviews

Extension files

Browse and explore files within this extension package

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No network indicators were extracted from this version.

Version
Size
Verdict
Findings
Permhash
14.1336.0
Latest
17.27 MBNot scanned—
edbaf09c2d26580be75182a92999154d68a056acc853a02a7e63ff83b8580026
14.1335.0
17.04 MBNot scanned—
edbaf09c2d26580be75182a92999154d68a056acc853a02a7e63ff83b8580026
14.1334.0
16.98 MBNot scanned—
edbaf09c2d26580be75182a92999154d68a056acc853a02a7e63ff83b8580026
14.1333.0
16.87 MBNot scanned—
edbaf09c2d26580be75182a92999154d68a056acc853a02a7e63ff83b8580026
14.1332.0
16.75 MBNot scanned—
edbaf09c2d26580be75182a92999154d68a056acc853a02a7e63ff83b8580026
14.1331.0
16.73 MBNot scanned—
edbaf09c2d26580be75182a92999154d68a056acc853a02a7e63ff83b8580026
14.1330.0
16.65 MBNot scanned—
edbaf09c2d26580be75182a92999154d68a056acc853a02a7e63ff83b8580026
14.1329.0
17.08 MBNot scanned—
edbaf09c2d26580be75182a92999154d68a056acc853a02a7e63ff83b8580026
14.1328.0
17.42 MBNot scanned—
edbaf09c2d26580be75182a92999154d68a056acc853a02a7e63ff83b8580026
14.1327.0
17.51 MBNot scanned—
edbaf09c2d26580be75182a92999154d68a056acc853a02a7e63ff83b8580026
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Code Diff

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