Browser - Cookies limits.

Typically, the following are allowed:

• 300 cookies in total
• 4096 bytes per cookie
• 20 cookies per domain
• 81920 bytes per domain^*

* Given 20 cookies of max size 4096 = 81920 bytes.

IE (and Opera) introduces a new limit, max bytes per domain

Reference :- http://browsercookielimits.squawky.net/