The comment "Spellchecking should always take place in the tool you write text with" just doesn't hold water. (a) Documents I receive as pdfs need a spellcheck because the original creator either didn't do a spellcheck or did an inadequate job. (b) You can make text edits in a pdf, and those need to be spellchecked. (c) I send word docs to typesetters, but they introduce errors in the typesetting process.
I have been using Acrobat since its advent. That argument was given by Adobe from the beginning. The world "runs on pdfs." It needs a spellchecker!

How does Acrobat not have a spellcheck as an option at least in preflight? I have to open pdfs in another program to check the spelling even though Acrobat can read everything on a pdf and presumably even just send the text through aspell

How could this get so many votes? Acrobat isn't a text writing and checking tool. It's for editing the results, the exported document. Spellchecking should always take place in the tool you write text with.
If I could vote this down I would, because Adobe may waste valuable resources for this ****.

Please have your engineering team look at this issue from the OCR correction standpoint. See my request/bug. If the OCR is corrected, then it should export to word with the corrections, so the work is not duplicated in word.

spellchecking for Arabic and Persian is most needed for me

agree with the comment above

You can do it using this (paid-for) tool I've developed for Acrobat, and even for Reader:
http://try67.blogspot.com/2009/07/acrobat-spell-check-suite.html
http://try67.blogspot.com/2010/07/reader-spell-check-suite.html

I proofread documents digitally as pdfs, and it blows my mind that there isn't a spell check tool available on Acrobat. Acrobat is used by millions to review documents. Why not build in a spell check tool?

Spell check is a KEY feature for any software that is used to perform reviews. This is especially important in today's world where the majority of edits are being done electronically.

In the case of my company, which publishes world language textbooks, we cannot afford to purchase InDesign for each and every editor. The people designing our files in InDesign are often not fluent speakers of the target language, so it is crucial that we find a way for our editors to spell check PDFs.

I concur, with such robust functionality, a built in spell checker should be very prominent and standard fare, I would think?

Thank you for any follow up on this or updates!

It's kind of ridiculous that you can't spell-check on non-editable content. Every reviewer is looking at a PDF. Why make them jump through hoops to do a simple spell-check?