When expressing happiness or gratitude, there are many synonyms that can replace the phrase "glad to". One alternative is the phrase "happy to", which conveys a similar feeling of joy. Another phrase that can be used is "pleased to", which suggests satisfaction and contentment. Another synonym is "delighted to", which is an even stronger expression of happiness. "Thrilled to" can be used when expressing extreme excitement. Other synonyms to convey a similar sentiment include "overjoyed to", "ecstatic to", "elated to", and "exhilarated to". Choosing the right synonym depends on the degree of happiness being expressed and personal preference.