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Segmenter

Free API for segmenting long text into chunks and tokenization.

Segmenter API

Our Segmenter API is crucial for helping LLMs manage input within context limits, and optimizing model performance. It allows developers to count tokens and extract relevant text segments, ensuring efficient data processing and cost management.
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Use GET request to count tokens
Use POST request for more features
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Request
curl -X POST 'https://segment.jina.ai/' \
  -H "Content-Type: application/json" \
  -d @- <<EOFEOF
  {
    "content": "\n  Jina AI: Your Search Foundation, Supercharged! 🚀\n  Ihrer Suchgrundlage, aufgeladen! 🚀\n  您的搜索底座，从此不同！🚀\n  検索ベース,もう二度と同じことはありません！🚀\n"
  }
EOFEOF

What is a Segmenter?

A segmenter is a crucial component that converts text into tokens or chunks, which are the basic units of data that an embedding/reranker model or LLM processes. Tokens can represent whole words, parts of words, or even individual characters.

Chunking long documents, lightning fast!

You can also use Segmenter API to cut long documents into smaller chunks, making it easier to process them in embeddings or rerankers. We leverage common structural cues and build a set of rules and heuristics which perform well across diverse types of content, e.g. Markdown, HTML, LaTeX and CJK languages.
Maximum length of each chunk: 1000
Maximum number of characters in each chunk. In practice the chunk length can be smaller than this value, if there is a good boundary in the text.
0 chunks in total
Segmenter API is free!
By providing your API key, you can access a higher rate limit, and your key won't be charged.
Rate Limit
Rate limits are tracked in two ways: RPM (requests per minute) and TPM (tokens per minute). Limits are enforced per IP and can be reached based on whichever threshold—RPM or TPM—is hit first.
ProductAPI EndpointDescriptionarrow_upwardw/o API Keyw/ API Keyw/ Premium API KeyAverage LatencyToken Usage CountingAllowed Request
Embedding APIhttps://api.jina.ai/v1/embeddingsConvert text/images to fixed-length vectorsblock500 RPM & 1,000,000 TPM2,000 RPM & 5,000,000 TPM
bolt
depends on the input size
 help
Count the number of tokens in the input request.POST
Reranker APIhttps://api.jina.ai/v1/rerankTokenize and segment long textblock500 RPM & 1,000,000 TPM2,000 RPM & 5,000,000 TPM
bolt
depends on the input size
 help
Count the number of tokens in the input request.POST
Reader APIhttps://r.jina.aiConvert URL to LLM-friendly text20 RPM200 RPM1000 RPM4.6sCount the number of tokens in the output response.GET/POST
Reader APIhttps://s.jina.aiSearch the web and convert results to LLM-friendly textblock40 RPM100 RPM8.7sCount the number of tokens in the output response.GET/POST
Reader APIhttps://g.jina.aiGrounding a statement with web knowledgeblock10 RPM30 RPM22.7sCount the total number of tokens in the whole process.GET/POST
Classifier API (Zero-shot)https://api.jina.ai/v1/classifyClassify inputs using zero-shot classificationblock200 RPM & 500,000 TPM1,000 RPM & 3,000,000 TPM
bolt
depends on the input size
 
Tokens counted as: input_tokens + label_tokensPOST
Classifier API (Few-shot)https://api.jina.ai/v1/classifyClassify inputs using a trained few-shot classifierblock20 RPM & 200,000 TPM60 RPM & 1,000,000 TPM
bolt
depends on the input size
 
Tokens counted as: input_tokensPOST
Classifier APIhttps://api.jina.ai/v1/trainTrain a classifier using labeled examplesblock20 RPM & 200,000 TPM60 RPM & 1,000,000 TPM
bolt
depends on the input size
 
Tokens counted as: input_tokens × num_itersPOST
Segmenter APIhttps://segment.jina.aiTokenize and segment long text20 RPM200 RPM1,000 RPM0.3sToken is not counted as usage.GET/POST
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FAQ
How to get my API key?
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What's the rate limit?
Rate Limit
Rate limits are tracked in two ways: RPM (requests per minute) and TPM (tokens per minute). Limits are enforced per IP and can be reached based on whichever threshold—RPM or TPM—is hit first.
ProductAPI EndpointDescriptionarrow_upwardw/o API Keyw/ API Keyw/ Premium API KeyAverage LatencyToken Usage CountingAllowed Request
Embedding APIhttps://api.jina.ai/v1/embeddingsConvert text/images to fixed-length vectorsblock500 RPM & 1,000,000 TPM2,000 RPM & 5,000,000 TPM
bolt
depends on the input size
 help
Count the number of tokens in the input request.POST
Reranker APIhttps://api.jina.ai/v1/rerankTokenize and segment long textblock500 RPM & 1,000,000 TPM2,000 RPM & 5,000,000 TPM
bolt
depends on the input size
 help
Count the number of tokens in the input request.POST
Reader APIhttps://r.jina.aiConvert URL to LLM-friendly text20 RPM200 RPM1000 RPM4.6sCount the number of tokens in the output response.GET/POST
Reader APIhttps://s.jina.aiSearch the web and convert results to LLM-friendly textblock40 RPM100 RPM8.7sCount the number of tokens in the output response.GET/POST
Reader APIhttps://g.jina.aiGrounding a statement with web knowledgeblock10 RPM30 RPM22.7sCount the total number of tokens in the whole process.GET/POST
Classifier API (Zero-shot)https://api.jina.ai/v1/classifyClassify inputs using zero-shot classificationblock200 RPM & 500,000 TPM1,000 RPM & 3,000,000 TPM
bolt
depends on the input size
 
Tokens counted as: input_tokens + label_tokensPOST
Classifier API (Few-shot)https://api.jina.ai/v1/classifyClassify inputs using a trained few-shot classifierblock20 RPM & 200,000 TPM60 RPM & 1,000,000 TPM
bolt
depends on the input size
 
Tokens counted as: input_tokensPOST
Classifier APIhttps://api.jina.ai/v1/trainTrain a classifier using labeled examplesblock20 RPM & 200,000 TPM60 RPM & 1,000,000 TPM
bolt
depends on the input size
 
Tokens counted as: input_tokens × num_itersPOST
Segmenter APIhttps://segment.jina.aiTokenize and segment long text20 RPM200 RPM1,000 RPM0.3sToken is not counted as usage.GET/POST
Other questions
Segmenter-related common questions
How much does the Segmenter API cost?
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The Segmenter API is free to use. By providing your API key, you can access a higher rate limit, and your key won't be charged.
If I don't provide an API key, what is the rate limit?
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Without an API key, you can access the Segmenter API at a rate limit of 20 RPM.
If I provide an API key, what is the rate limit?
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With an API key, you can access the Segmenter API at a rate limit of 200 RPM. For premium paid users, the rate limit is 1000 RPM.
Will you charge the tokens from my API key?
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No, your API key is only used to access a higher rate limit.
Does the Segmenter API support multiple languages?
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Yes, the Segmenter API is multilingual and supports over 100 languages.
What is the difference between GET and POST requests?
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GET requests are solely used to count the number of tokens in a text, allows you easily integrate it as a counter in your application. POST requests supports more parameters and features, such as returning the first/last N tokens.
What is the maximum length I can tokenize per request?
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You can send up to 64k characters per request.
How does the chunking feature work? Is it semantic chunking?
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The chunking feature segments long documents into smaller chunks based on common structural cues, ensuring accurate segmentation of text into meaningful chunks. Essentially it is a (big!) regex pattern that segments text based on certain syntactical features that often align with semantic boundaries, such as sentence endings, paragraph breaks, punctuation, and certain conjunctions. It is not semantic chunking. This (big) regex is as powerful as it can be within the limitations of regular expressions. It balances complexity and performance. While true semantic understanding isn't possible with regex, it well-approximates context by common structural cues.
How do you handle special tokens such as 'endoftext' in the Segmenter API?
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If the input contains special tokens, our Segmenter API will put them in the field 'special_tokens'. This allows you to easily identify them and handle them accordingly for your downstream tasks, e.g. removing them before feeding the text into an LLM to prevent injection attacks.
Does chunking support other languages than English?
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Besides western languages, chunking also works well with Chinese, Japanese, and Korean.
API-related common questions
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Can I use the same API key for embedding, reranking, reader, fine-tuning APIs?
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Yes, the same API key is valid for all search foundation products from Jina AI. This includes the embedding, reranking, reader and fine-tuning APIs, with tokens shared between the all services.
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Can I monitor the token usage of my API key?
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Yes, token usage can be monitored in the 'Buy tokens' tab by entering your API key, allowing you to view the usage history and remaining tokens.
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What should I do if I forget my API key?
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If you have misplaced a topped-up key and wish to retrieve it, please contact support AT jina.ai with your registered email for assistance.
Contact
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Do API keys expire?
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No, our API keys do not have an expiration date. However, if you suspect your key has been compromised and wish to retire it or transfer its tokens to a new key, please contact our support team for assistance.
Contact
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Why is the first request for some models slow?
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This is because our serverless architecture offloads certain models during periods of low usage. The initial request activates or 'warms up' the model, which may take a few seconds. After this initial activation, subsequent requests process much more quickly.
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Is user input data used for training your models?
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We adhere to a strict privacy policy and do not use user input data for training our models.
Billing-related common questions
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Is billing based on the number of sentences or requests?
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Our pricing model is based on the total number of tokens processed, allowing users the flexibility to allocate these tokens across any number of sentences, offering a cost-effective solution for diverse text analysis requirements.
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Is there a free trial available for new users?
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We offer a welcoming free trial to new users, which includes one million tokens for use with any of our models, facilitated by an auto-generated API key. Once the free token limit is reached, users can easily purchase additional tokens for their API keys via the 'Buy tokens' tab.
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Are tokens charged for failed requests?
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No, tokens are not deducted for failed requests.
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What payment methods are accepted?
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Payments are processed through Stripe, supporting a variety of payment methods including credit cards, Google Pay, and PayPal for your convenience.
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Is invoicing available for token purchases?
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Yes, an invoice will be issued to the email address associated with your Stripe account upon the purchase of tokens.
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402, Floor 4, Fu'an Technology Building, Shenzhen Nanshan, China
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