Find below one of the sample format of Experience letter, hope it would help.
DRAFT OF EXPERIENCE LETTER
Mr/ Ms. ____________
TO WHOMSOVER IT MAY CONCERN
This is to certify that Mr. __________________ ( name of the employee ) was working at ___________________( Company Name ) As _______________ ( Designation of the employee ) from ____________________ ( date of joining) to _______________( last working date ).
During his tenure, we found him to be .....................his services were found to be satisfactory.
We wish him all the best in his future endeavors.
23rd December 2007 From India, Ahmadabad