API Documentation > IntelliDocs API > Standards.

Transport Security

The connection must be over HTTPS and TLS 1.2+.

Supported File Formats

The following image types are supported:

  • Microsoft Office: DOC, DOCX, XLS, XLS, PPT, PPTX
  • Open Office: ODS, ODT, ODP
  • PDF: Both digital and image-only files are supported. PDFs may be single or multi-page and may contain multiple document types (e.g., 3 ID pages plus 1 invoice).
  • ZIP: Must contain the supported file formats
  • MSG: Outlook message files and the contents within (e.g., email's PDFs attachments)

You can submit files up to 20 MB, and the total request can be up to 32 MB.

Submission Process and Requirements

If you need to submit a file, you can do so by sending it in binary format encoded in Base64.

  1. Encode your file: Convert your file into a Base64-encoded string. For instance, you can send something like this:
    • For a JPEG image: data:image/jpeg;base64,/9j/4AAQSkZJR...
    • For a PDF document: data:application/pdf;base64,/9j/4AAQSkZJR...
  2. Include file type: Make sure to specify the file type in the encoded data, whether it's an image or a document.

That's it! You've successfully encoded your file in Base64 format for submission. Alternatively, you can provide the document's URL.

Error handling

The API returns standard HTTP status codes. Hence, if you face one of the following warning messages, here is what they mean:

Response codeMeaning
401invalid authentication
402lack of payment
403disabled accounts
404invalid URLs
429rate-limited requests
500internal errors

Plus, all error responses contain a message attribute to communicate the problem.


The API is rate-limited at 10 requests/second. If the API takes longer than 5 minutes to process a document it will return 500 with a timeout error.

Each image/document should be less than 20 MB, and the total request should be under 32 MB containing at maximum 20 pages each one.