There are a couple of places to look for Hertfordshire wills, depending on how far back you're going.
Wills 1413 - 1857
Search the indexes for wills, inventories, administration bonds, accounts and other related documents proved in the church courts on Hertfordshire Names Online.
The National Archives also holds wills proved in the Prerogative Court of Canterbury for some Hertfordshire people.
Essex Records Office holds some historical wills for those who lived in East Hertfordshire.
Wills and probate from 1858
Try GOV.UK for wills dating from 1858 onwards. This includes wills for soldiers who died while serving in the British Armed Forces from 1850 to 1986.
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