I want to confirm what is the total search keywords can be searched at a single query in Azure AI Search

Question

I want to confirm what is the total search keywords can be searched at a single query in Azure AI Search

Nagar, Sunil 0

I am searching within Azure Index via REST API, now I want to confirm what is the search query limit such as how many keywords searches I can do within one single query with AI Search.

kagiyama yutaka 4,915 Reputation points

2026-08-11T09:56:56.6366667+00:00

If you don’t mind, could you share which query syntax you’re using in Azure AI Search? The limits aren’t the same for simple query, full Lucene, and semantic search, so knowing the exact syntax helps check how many keywords a single query can handle.

3 answers

Your answer

kagiyama yutaka 4,915 Reputation points

2026-08-11T09:56:56.6366667+00:00

If you don’t mind, could you share which query syntax you’re using in Azure AI Search? The limits aren’t the same for simple query, full Lucene, and semantic search, so knowing the exact syntax helps check how many keywords a single query can handle.

Answer 1

Nithin 245

Hi,

Here are the official query and search keyword limits for Azure AI Search:

Individual Search Term Limit: Maximum 32,766 bytes (~32 KB) per keyword term (or 1,000 characters for prefix/regex searches).
Total Search Clause Limit: Maximum 100,000 characters in the search query string.
Maximum Query Expressions: Up to 3,000 clauses (or 1,024 in simple syntax) joined by AND/OR.
Request Payload: Up to 16 MB for POST requests (or 8 KB URL length for GET requests).

Ref: Azure AI Search Query & Service Limits

0 comments

Answer 2

Hi @Nagar, Sunil

Thanks for reaching out to Microsoft Q&A. I understand you are evaluating the Azure AI Search capabilities, and for such there isn't really a "number of keywords" limit, but instead, what Azure AI Search actually caps is the number of search clauses (terms/expressions joined by AND/OR) in a single search query, plus a few related size limits on the query and on individual terms.

Based on the Service limits in Azure AI Search documentation, the current limits for the Query APIs are:

Maximum number of clauses in a search query: 3,000
Maximum length of a single search clause: 100,000 characters
Maximum search term size: 32,766 bytes (32 KB minus 2 bytes) of UTF-8 encoded text for keyword search and vector-search text
Maximum search term size for prefix search or regex search: 1,000 characters
Overall request payload: up to 16 MB for POST requests; GET requests are limited to an 8‑KB URL

One thing worth flagging: the Simple query syntax doc page lists the max clause count as 1,024 rather than 3,000. I'd treat the dedicated Service limits page as the current source of truth for capacity planning, since it's the article Microsoft maintains specifically for these numbers. Still, if you're building a query composer that could realistically approach these limits, it's worth designing it so it can't generate an unbounded number of clauses in the first place, since both pages call out that unbounded queries can destabilize the search service.

Please 'Upvote ' (thumbs-up) and 'Accept' as an answer. This will be helpful to other community members facing the same issue.

Best regards, Andrew S Taylor

Answer 3

For a single Azure AI Search query, the supported limits are:

Maximum search clause length: 100,000 characters
Maximum number of clauses in search: 3,000 for Query APIs
For simple query syntax: 1,024 clauses when expressions are separated by AND or OR
Maximum search term size: about 32 KB for a term in UTF-8 text
Prefix search term size: 1,000 characters
REST GET URL length: 8 KB maximum
POST request payload size: 16 MB maximum

If “how many keywords” means how many terms can be combined in one query, the practical limit is controlled by the number of clauses and the total search clause length, not by a separate keyword-count setting.

If the query is being built programmatically, keep it bounded because very large queries can destabilize the service.

References: