Guild reputation

Guild reputation is gained through the following means:


 * Turning in a quest
 * Guild group boss kills
 * Guild group pvp activity

Certain levels of guild reputation are required to purchase and use some guild rewards.

Reputation bonuses
Certain bonuses to guild reputation can be gained:

While the base guild reputation cap per week is 4375, is it possible to increase this cap with:
 * Mr. Popularity
 * Diplomacy (human racial)
 * Renowned Guild Tabard
 * Illustrious Guild Tabard
 * Banner of Cooperation
 * Standard of Unity
 * Battle Standard of Coordination

Contrary to popular belief, these buffs do not allow you to reach the weekly cap faster. The 4375 is actually the unmodified cap, for example:

Let's say you did 10 quests as a human in a level 12+ guild and your guild UI shows your weekly rep count increased from 0 to 400 (40 each), but if you look at the actual values in your reputation UI, the number will have increased by 480 which is the base 400 +10% for the racial and +10% for the perk. So for the same human, once the guild UI reads 4375/4375 in reality the character has gained (4375*120%) = 5250 reputation.

Speculation
Albeit not confirmable at the moment, it is likely that the seasonal buffs The Spirit of Sharing and Invocation of the Wickerman would affect guild reputation and its cap in the same way.

Losing Guild Reputation
If you are kicked from or leave a guild, you do not lose your reputation with that guild immediately. You will lose it if you:
 * 1) Allow 30 days to elapse after becoming unguilded
 * 2) Join a different guild
 * 3) Transfer the character to a different account (which de-guilds you)

Note that upon joining a different guild your guild reputation is reset immediately.

Guild titles
When meeting certain reputation levels, your guild tag will change. Please note that your tag can only be seen by yourself (by turning the 'My Name' option on in the Name display options) and your guildmates.