Request limits for Translator Text
This article provides throttling limits for the Translator Text API. Services include translation, transliteration, sentence length detection, language detection, and alternate translations.
Character and array limits per request
Each Translate request is limited to 5,000 characters. You're charged per character, not by the number of requests. It's recommended to send shorter requests.
The following table lists array element and character limits for each operation of the Translator Text API.
|Operation||Maximum Size of Array Element||Maximum Number of Array Elements||Maximum Request Size (characters)|
|Dictionary Examples||100 for text and 100 for translation (200 total)||10||2,000|
Character limits per hour
Your character limit per hour is based on your Translator Text subscription tier. The hourly quota should be consumed evenly throughout the hour. If you reach or surpass these limits, or send too large of a portion of the quota in a short period of time, you'll likely receive an out of quota response.
|F0||2 million characters per hour|
|S1||40 million characters per hour|
|S2 / C2||40 million characters per hour|
|S3 / C3||120 million characters per hour|
|S4 / C4||200 million characters per hour|
Limits for multi-service subscriptions are the same as the S1 tier.
These limits are restricted to Microsoft's standard translation models. Custom translation models that use Custom Translator are limited to 1,800 character per second.
The Translator Text API has a maximum latency of 15 seconds using standard models. Translation using custom models has a maximum latency of 25 seconds. By this time you'll have received a result or a timeout response. Typically, responses are returned in 150 milliseconds to 300 milliseconds. Response times will vary based on the size of the request and language pair. If you don’t receive a translation or an error response within that timeframe, you should check your network connection and retry.
Sentence length limits
When using the BreakSentence function, sentence length is limited to 275 characters. There are exceptions for these languages:
This limit doesn't apply to translations.
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