Spell Check

Mathcha includes a built-in spell checker powered by Hunspell. It highlights misspelled words with a red underline and offers correction suggestions through the right-click context menu.

Enabling Spell Check

Spell check is disabled by default (language set to None). To enable it, open Document Settings from the Menu:

In the Document Settings dialog, find the Spell check language dropdown and select your language:

Supported Languages

The following languages are available out of the box:

Code	Language
de	German
de-at	German (Austria)
de-ch	German (Switzerland)
en-au	English (Australia)
en-ca	English (Canada)
en-gb	English (United Kingdom)
en-us	English (United States)

You can also add custom dictionaries for additional languages (see Adding Custom Dictionaries).

How It Works

Once a spell check language is selected, misspelled words are underlined in red:

Right-click on a misspelled word to see the Spell Check submenu with:

• Ignore (current doc) — add the word to the ignore list for this document only
• Ignore (globally) — add the word to the global ignore list across all documents
• Suggestions — click a suggestion to replace the misspelled word

Status Bar

The status bar at the bottom of the editor shows the current spell check language, word count, and math count:

Click More to open a detailed view with word and character statistics, plus a [Change] link to quickly switch the spell check language:

Ignore Lists

When you ignore a misspelled word, it is added to an ignore list so it will no longer be underlined. There are two levels:

• Per-document — the word is ignored only in the current document
• Global — the word is ignored across all your documents

You can manage the per-document ignore list by clicking the More button next to the spell check language in Document Settings. The ignore dialog lets you add or remove words:

Click Configure Ignore Globally to manage the global ignore list.

Adding Custom Dictionaries

To add support for a language not in the built-in list, click the More button next to the spell check language dropdown in Document Settings. This opens the dictionary manager where you can add a custom Hunspell dictionary.

The dialog has two types:

• Preset — select from a built-in language and Mathcha provides the dictionary files automatically
• Define — specify a custom language with your own Hunspell dictionary files

For a custom dictionary, provide:

Field	Description
Language Code	A short identifier (e.g., vi, fr)
Language Name	Display name (e.g., Vietnamese, French)
Unicode Ranges	Character range filter (default: All)
Hunspell .dic Url	URL to the Hunspell .dic dictionary file
Hunspell .aff Url	URL to the Hunspell .aff affix/rules file