copy- pasted z dictionary.com:
TOO:
In addition; also: He\'s coming along too.
More than enough; excessively: She worries too much.
To a regrettable degree: My error was all too apparent.
Very; extremely; immensely: He\'s only too willing to be of service.
Informal. Indeed; so: You will too do it!
AS WELL:
1. In addition, besides, also. For example, Mary is going to Italy and to France as well, or A fine conductor, he plays the violin as well. [1300s]
2. With an equal or similar result, as in Since he can\'t get there in time, he might as well stay at home, or It\'s just as well that you came today, since Harry is here, too. [1400s]