Fix Grammarly Not Working in HubSpot: 6 Proven Steps (2026)

Usually, when Grammarly is not working in HubSpot, the trouble comes down to one of three culprits: a stubborn editor surface that rejects injections, a browser extension missing the right permissions, or a clash with another tool—most often the HubSpot Sales Outlook add-in. It feels like a small glitch, but it’s enough to derail your workflow.

Imagine you’re drafting a high-stakes follow-up email. You see the underlines, but clicking them does nothing. Or worse, the text suddenly duplicates. This isn’t your fault; it’s a typical rich text editor (RTE) conflict. These editors try to manage formatting while Grammarly tries to manage the text, and they end up fighting over the same paragraph. Still, you don’t have to just guess at the fix.

Step one: stop guessing. You need to pinpoint exactly where the breakdown happens—whether it’s a specific HubSpot screen, your browser choice, or that sneaky Outlook overlay. Once you’ve identified the failure mode, the solution becomes straightforward. Let’s look at how to get your writing assistant back on track without wasting your afternoon.

What you’ll need (Preparation for a 15-minute fix)

Before you start toggling settings at random, set up a clean baseline. Troubleshooting is much faster when you aren’t chasing ghosts. Plus, having a consistent test case proves the fix actually works.

• Access to a Chromium-based browser (Chrome or Edge) and a secondary browser for comparison.
• The Grammarly extension installed (and the desktop app, if you use it).
• Access to two different areas in HubSpot: a simple CRM note and a complex editor like the email template builder.
• The ability to disable or enable the HubSpot Sales Outlook add-in, even if just for a test.
• A specific test sentence. For example: “This are a test sentence with bad grammer, missing comma and doubled doubled words.”

Having a “sacrificial” paragraph helps because you can paste it everywhere to see if the engine triggers. Then again, if your company uses strict enterprise policies, you might find your extension permissions are locked. In that case, these tests will give you the evidence you need to hand over to your IT admin.

Grammarly not working in HubSpot: The Conflict: Why HubSpot editors break ext

The main reason Grammarly is not working in HubSpot is the complexity of the platform’s editors. HubSpot doesn’t use a single text box for everything. Instead, it employs various layers of rich text technology that rewrite your code as you type. While a simple note field is easy for Grammarly to read, a marketing email editor is a heavy DOM structure that can confuse the extension’s scripts.

Think of it like two people trying to edit the same Google Doc at once. One is trying to bold text; the other is trying to fix a typo. Sometimes they get in each other’s way. This leads to a few common patterns:

• The Absent Assistant: You see no icon and no underlines. The extension simply doesn’t recognize the field as a place to write.
• The Ghost Edit: Underlines appear, but clicking “accept” doesn’t change anything. The editor has blocked the change.
• The Snap-Back: The edit applies for a split second, then the HubSpot editor reverts it to the original version.
• The Formatting Glitch: The edit sticks, but your links or spacing suddenly disappear.

Since Grammarly uses different colored underlines for different tasks (red for grammar, blue for clarity), pay attention to what disappears. If you only lose the advanced suggestions, it’s a sign that the editor is too complex for full rewriting but can still handle basic spell-check.

The Fix: Browser permissions and Site Access

If the extension doesn’t show up on HubSpot pages at all, the issue is likely rooted in your browser’s security settings. In 2026, browsers like Chrome are increasingly picky about which sites can run extension scripts. You can find technical details on this in the Chrome extension permissions documentation, but the practical fix is simpler.

Check your extension settings to see if Grammarly is set to “On all sites” or “On click.” If it’s set to the latter, it will never activate automatically in HubSpot. Besides, you should verify that it has access to your specific HubSpot subdomain. Sometimes an extension is allowed on hubspot.com but blocked on app.hubspot.com by a corporate filter.

• Run a test in Incognito: This is the fastest way to see if another extension is interfering. If it works there, you have a conflict between extensions.
• Check the Pause status: It sounds basic, but ensure you haven’t accidentally paused the extension for the HubSpot domain during a previous session.
• Review Domain Permissions: Make sure both your portal domain and the login pages are allowed.

Unless you confirm these permissions, you might spend hours looking for a bug that’s actually just a browser lock. If you are on a managed device and cannot change these, you’ll need to ask your admin to allowlist the domain.

The Investigation: Outlook Add-ins and the Conflict Matrix

A specific clash occurs when you use the HubSpot Sales Outlook add-in. This tool changes the environment of the compose window, which can block Grammarly from “seeing” the text field properly. Microsoft explains how these integrations work in their Outlook add-ins overview, but for you, it just means things get buggy.

To solve this without guessing, use this matrix. It helps you find the smallest change that fixes the error. You can even copy this into a support ticket to get a faster response from IT.

While testing, categorize your result simply. Is it ABSENT (no icon), VISIBLE (underlines appear but don’t work), or OK (everything works)? This clarity prevents you from chasing the wrong solution. Since many people use both tools simultaneously, knowing which one to toggle is half the battle.

The Process: A Minimal Reproduction Checklist

When you report that Grammarly is not working in HubSpot, you’ll get a faster fix if you follow this specific checklist. It proves what’s broken and what’s not, which saves your support team from asking the same five questions. Plus, it might fix the problem for you during the process.

1. Fresh Start: Open an incognito window with only your writing assistant enabled. This removes background noise.
2. Permission Check: Verify the extension is active on the current HubSpot domain. If you’re on a unique portal URL, it might need manual approval.
3. The Simple Test: Go to a CRM contact and try to add a short note. If it works here but not in emails, the issue is the editor type, not the extension itself.
4. The Add-in Toggle: If you use Outlook, turn off the HubSpot add-in for one email. If the problem disappears, you’ve found the conflict.
5. The Fallback Check: Check if the Grammarly web editor works as a separate tab. It often supports pasting text directly.

If you usually draft in Google Docs, you might find it easier to do your heavy editing there first. You can even use AI assistants inside Google Docs to polish your draft before moving it to the CRM. Even though this adds a step, it’s more reliable than fighting a glitchy interface.

The Strategy: Workarounds when the fix won’t stick

Sometimes, an editor is just too restrictive. In those cases, don’t waste time trying to force a fix. Instead, use a “workaround ladder.” Start with the easiest fix and move up only if necessary. Since the goal is to send clean emails, the method matters less than the result.

• Rung 1: Accept only simple fixes. Use the tool for spelling and commas, but don’t try to use the “rewrite” feature inside HubSpot’s complex editors. It often causes formatting to break.
• Rung 2: The “Outside-In” method. Draft your long emails in a stable environment like Word or a dedicated writing app. Then, paste the finished text into the CRM. It’s the most reliable way to keep your formatting intact.
• Rung 3: Use Snippets. If you find yourself fixing the same phrases over and over, save them as snippets. This bypasses the need for live editing. Just remember that pricing for these features can change, so check the latest details on the official site.
• Rung 4: Manual override. If clicking “accept” causes the cursor to jump, just type the correction manually. It’s frustrating, but it’s faster than re-typing a whole deleted paragraph.

Still, be careful with AI-generated suggestions. They can sometimes make your sales emails sound a bit robotic or “sludge-like.” If you want to see how different assistants compare, you can look at this breakdown of AI tools in 2026. While it won’t fix your HubSpot plugin, it might help you decide where to draft your first version. Unless you’re in a rush, a second pass in a clean doc is usually worth the extra minute.

Affiliate disclaimer: This site may earn a commission if you buy through some links. We still recommend tools based on fit, not hype.

Conclusion: To get back to work, fill out the conflict matrix and run the minimal checklist in an incognito window. By separating the editor limitations from permission issues and add-in clashes, you’ll find a path forward. Whether you fix the root cause or move to a drafting-outside workflow, you can stop fighting the “why won’t it apply?” battle and focus on your writing.