# Grammalecte \[fr\]

> French grammar checker. Included: conjugation tool, lexicographer, text formatter and spelling dictionaries.

Canonical page: [https://chrome-stats.com/d/grammalecte-fr](https://chrome-stats.com/d/grammalecte-fr)

## Overview

- **ID:** `grammalecte-fr`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Algoo
- **Category:** language-support,other
- **Daily users:** 12,208
- **Weekly downloads:** 201
- **Rating:** 4.28 / 5 (103 ratings)
- **Version:** 2.3.0
- **Last updated:** 2025-12-22
- **First published:** 2016-05-06
- **Size:** 6.90 MB
- **Data as of:** 2026-09-10
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/grammalecte-fr/)
- **Website:** [https://grammalecte.net/forum.php?prj=fr&f=8](https://grammalecte.net/forum.php?prj=fr&f=8)

## Description

**Grammalecte** is a powerful French grammar checker designed to improve your writing with precision and convenience. It offers an extensive conjugation tool covering around 8,000 verbs, a lexicographer, and a text formatter that automatically corrects common typographical errors. 

Unlike many online grammar tools, Grammalecte is fully written in JavaScript and operates entirely offline, ensuring your data remains private with no information sent online. It integrates seamlessly with various platforms including Thunderbird, Chrome, LibreOffice, and OpenOffice, providing comprehensive support for French language users seeking accurate grammar and spelling assistance.

## Rankings

- #690 — Overall
- #28 — Language Support
- #93 — Other extensions
- #2 — ai grammar
- #5 — grammar
- #16 — french

## Permissions and access

### Permissions

- `*://localhost/*`
- `*://dic.grammalecte.net/*`
- `activeTab`
- `contextMenus`
- `cookies`
- `downloads`
- `clipboardWrite`
- `storage`

### Content script matches

- `<all_urls>`
- `*.wikisource.org`
- `*.wikipedia.org`
- `*.wiktionary.org`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension website URL may be invalid

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

Grammalecte \[fr\] is praised for its accurate French grammar error detection and usefulness across various platforms, making it indispensable for many users. However, multiple users report functional issues, especially with formatted text inputs like Overleaf, causing text corruption or duplication. Some find it complex to use or lacking visible error highlights. A few strong negative reports claim it injects ads and disables ad blockers, though these are less widespread. Overall, the add-on is valued but may face compatibility and usability challenges for certain users or contexts.

### Pros

- Detection of grammatical errors is accurate and pertinent.
- Very useful and even indispensable for those who want to avoid mistakes in French writing.
- Compatible and used across multiple platforms including LibreOffice, Firefox, Chrome, and Chromium.
- Provides comprehensive corrections and is appreciated by its user base.
- Free and open-source tool maintained actively by the developer.

### Cons

- Incompatibility issues with formatted text areas like Overleaf, leading to document corruption or loss.
- Not all users find it works well; some report it as unusable or causing text duplication and reordering errors.
- Reported that it may inject unwanted advertisements and block ad blockers (though this is a strong claim with limited corroboration).
- Some find the extension complicated, not intuitive, or difficult to use, especially for less tech-savvy users.
- Lack of visible error highlighting in some input areas frustrating users.

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Source: [Chrome-Stats](https://chrome-stats.com/d/grammalecte-fr)