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Question

How much is max size of document you can send from Appian to external system via Integration?

A
Anonymous
December 19, 2025

Answer

The Content Type you set in the Request Body section decides the request body limit. Below table shows all the limits


Request Body Content Type

Request Body Limits

Document (auto-detect)

If it document there no strict limit imposed by Appian. Best practice it to keep binary request bodies under 250 MB

JSON (application/json) (if are sending data to external system as JSON)

Limit : 5 MB & 75 MB of base64

XML (application/xml) (if are sending data to external system as XML)

Limit : 5 MB & 75 MB of base64

Multipart Form Data (multipart/form-data)

Limit is 5 MB , except for documents which have no limit. For a single multipart request , keep the total size of all the documents to 250 MB or less

Text (text/plain)

5 MB

Custom

5 MB

Conclusion : In appian for sending document there is no limit , only thing is best practice to maintain doc file under 250MB.

Below the one example how can we send the document through

ContentType: "Document (auto-detect)"

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Request : Appian automatically converts your document into binary

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Sending document through JSON


Similarly we can send the document through Json , as shown in the image

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Appian converts the document to Base64 as shown in the below image, even it exceed the 5mb appian will process it and converts the document into Base 64

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For more about the integration object visit official Appian Documentation

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