# Introduction The OnVision API is an HTTP JSON REST API that provides AI-based document extraction for all types of documents with a high success rate. Different types of documents such as invoices, contracts, identity cards and custom documents can be extracted with ease. Table rows such as invoice line items are extracted efficiently. The OnVision API supports the following features: * OnVision support 119 different [languages](https://docs.onvision.ai/api-book/language-support). * Handwritten texts for English based documents * Scan documents such as PDF's with up to 1000 pages, within a single file. * We also support other formats such as JPEG, PNG, BMP, and TIFF, up to 25Mb's per file. * Extract documents synchronous and asynchronous depending on your needs. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.onvision.ai/api-book/master.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.