[Tex2002ans]

Originally Posted by KevinH

Sigil supports user and/or book specific dictionaries. Add correct words missing from the main dictionary to your user dictionary. Then load that user dictionary the next time you load the book to continue spellchecking.

Originally Posted by MicroDrie

Another thing you can do if you have a very large epub file is to consider putting each chapter in a separate file and checking it for typos. That will go faster, and it will be easier to find where you left off. Once checked and corrected, you can copy the chapter back and overwrite the original file.

Another helpful method I use is adjusting shortcut keys:

Edit > Preferences > Keyboard Shortcuts

I've reassigned these two:

• Ignore Misspelled Word (I use F5)
• Next Misspelled Word (I use F4)

(You could even assign these to side mouse buttons [using AutoHotKey or something similar].)

This lets me easily blast through the entire book with a lightning-fast two-button press:

Correctly spelled (like a name)? F5. (Ignore.)

Word is fine in this case? F4. (Skip.)

I start from the beginning of the book, then:

F5, F5, F4, F5, [...]

making my way through in a single pass with two fingers only.

Note: This "from beginning-to-end method" is extremely helpful when reaching the Index. Any red squigglies you see there are probably actual errors in the book itself. (So common to have typos, misspellings of names, etc. sneak into the Index.)

And if you reach the Index, then see a correct word/name, that means your actual book had the typo and you accidentally "Ignored" it (or it existed in the dictionary)!

I've caught hundreds of otherwise-slipped-through-the-cracks typos this way.

* * *

If you use Tools > Spellcheck > Spellcheck, you can also add words to dictionary from there.

If you uncheck "Show All Words" + sort by Count, you can see the most common "misspelled words" within your book.

You can quickly look through that list, adding the most common first/last names (etc.) to the User dictionary.

Then you can do the one-by-one checking with much fewer squigglies.