API limits

The Issuu API is open to Premium and Optimum users, but certain restrictions are in place to ensure fair usage and stability.

APIs available

Using the API you can manage many of the same resources that are available on the web site: Specifically documents, folders, bookmarks, managing document embeds, and generating embed code for easy integration into your own website.

Upload limits

• On the Premium plan, there is a maximum number of documents you can upload via the API per month
• The limit applies to direct uploads as well as URL uploads
• The limit does NOT apply to documents uploaded via the issuu.com website.
• The error code returned will be "295 - Limit of monthly API uploads exceeded". See table below

	Premium	Optimum
Uploads	Max 10 per month	Unlimited

Format limits

The file you upload needs to adhere to a few limitations regarding the format. The file type must be one of PDF, ODT, DOC, WPD, SXW, SXI, RTF, ODP or PPT, and the page count cannot exceed 500 pages.

	Premium	Optimum
File size	Max 500mb	Max 500mb
Document size	Max 500 pages	Max 500 pages

Request limits

• API calls are bound by a rate limit restriction to ensure that system resources are distributed evenly among all users
• The load is calculated using a leaky bucket algorithm where infrequent bursts of requests are allowed
• After having depleted the burst limit errors will be returned in subsequent API calls if these are performed at a rate higher than the sustained limit
• The error code returned will be "012 - Request throttled". See table below
• If you are careful to always query the API at a rate lower than the sustained rate you won't ever run into rate limit issues
• If you run into rate limit errors on read requests consider caching earlier responses as API data often won't change very fast
• For rate limit errors on write request try to spread them over a larger time period if possible
• It should be pretty rare to hit the throttling affect unless you are doing something unusual

	Premium	Optimum
Burst limit	20 requests	20 requests
Sustained limit	3 request per sec.	3 request per sec.

The table below lists the error codes that relate to API limits:

Code	Message	Explanation
012	Request throttled	Requests are submitted at a rate that exceeds burst and sustained limits
205	File size is too large	File uploaded exceeds the size limit of the account type
294	Limit of unlisted publications exceeded	File uploaded exceeds the limit of unlisted publications purchased
295	Limit of monthly API uploads exceeded	File uploaded exceeds the limit of the account type