This API is currently in "preview" mode, but please don't let that change your mind. While we have many developers using them all over the world, we are still doing some additional building and testing until we feel really comfortable that they are just right for general consumption. Go ahead, grab a key and try them.

Bing Spell Check API

Help users correct spelling errors, recognize the difference among names, brand names, and slang, as well as understand homophones as they’re typing.

See for yourself

Try out the spell check capabilities. Switch between spell correction for web searches (‘Spell’) and documents (‘Proof’) from the top-left drop-down. ‘Spell’ is more aggressive in order to return better search results, while ‘Proof’ is less aggressive and adds capitalization, basic punctuation, and other features to aid document creation.

Word breaks

Correct word-breaking issues with a single flag.


Easily recognize slang and informal language.


Spot common name errors in context.


Fix homonyms and other hard-to-spot errors in context.


Provide support for new brands and other coined expressions as they emerge.

Pricing options

Plan Description Price
Free 5000 calls per month Free
S1 Standard 10K calls per month $5 per month, no overage
S2 Standard 100K calls per month $50 per month, overage at $50 per 100K calls
S3 Standard 1M calls per month $450 per month, overage at $50 per 100K calls
Buy on Azure

Developer resources for Bing Spell Check API