Limits

Plugins

Package (.html or .zip)	up to 10 MB and 500 files
Unpacked .zip	up to 64 MB and 2000 files
Sheets and tables per plugin	up to 20
Webhooks per plugin	up to 20; each one’s example, up to 4 KB
id and type	up to 120 characters
name, title and author	up to 120 characters
description	up to 1000 characters

The document

A field’s name	up to 64 characters: unaccented letters, numbers and _
A path’s depth	up to 12 levels (up to 24 segments counting list items)
A field’s text	up to 100,000 characters
The whole document	up to 5 MB and 20,000 nodes (each group of fields, list or item counts as a node); a write that would go past that is refused (doc.on('rejected', …))
Numbers	finite (no Infinity or NaN)

Per open sheet

Rolls	10 every 10 seconds
Chat messages	10 every 10 seconds (up to 2000 characters each)
Webhooks	20 per minute
RPGDesk.storage	1 MB per plugin, per person
RPGDesk.ui.download	up to 20 MB
Card lines	up to 120 characters

Webhooks in the room

Sends	30 per minute, per room
Data sent	up to 16 KB as JSON
The service’s answer	up to 64 KB
Answer time	10 seconds

Rolls

Dice of one kind	from 1 to 255, with 1 to 255 faces
Roll size	up to 300 dice and terms

The room

Room name	from 5 to 60 characters
Traits	up to 12
Welcome message	up to 500 characters
Status message	up to 120 characters
Rooms open at the same time	up to 8
Card bars and lines	4 of each (indexes 0 to 3 in rpgdesk.js)
Macros	name up to 30 characters, up to 20 lines

Files and accounts

Each person’s space	the plan’s: 100 MB on Free, 5, 25 or 100 GB on the paid ones (Plans and space)
One file	the plan’s: up to 25 MB on Free and up to 100 MB on the paid ones
Profile and room picture	up to 2 MB (PNG, JPEG, WebP or GIF)
UVTT map	about 4/3 of the plan’s largest file, plus 2 MB (the image is embedded in the file)
Account name	from 3 to 24 characters
Password	at least 8 characters