Phylis Sharp, 76, Phylis Blackwood, 59, and Susan Sherry, 46, gave bereaved relatives false invoices with inflated prices and pocketed the extra cash at T&R O'Brien.
All three were sacked by the firm's owners, Dignity Funerals, after their scheme came to light.
The total amount defrauded was £4000 between April 2008 and March 2011 at the funer-al parlour in Maryhill Road, Glasgow.
Blackwood, of Hamil-ton, South Lanark-shire, and Sherry, from Summerston, Glasgow pleaded guilty at Glasgow Sheriff Court to carrying out the fraud.
Sharp, of Bearsden, East Dunbartonshire, admitted her part in the scheme involved £1000.
Passing sentence, Sheriff Lindsay Wood said: "You have spoiled what were previously unblemished lives.
"Phylis Blackwood, I think you carried more culpability as you were the office manager and in my view that makes it worse."
Blackwood and Sherry were given community service orders for 240 hours and 220 hours respectively and Sharp was ordered to carry out 200 hours.
All three were given tagging orders for four months and must stay in their homes between 9pm and 6am.
The court heard Blackwood suggested the women split £500 that a family was over-charged in error for a casket.
She initially told Sherry, who had flagged up the mistake to her, to refund the cash but she later changed her mind.
Procurator fiscal dep-ute Adele MacDonald said: "It came to light in about February 2011 that there was some discrepancies and members of staff became suspicious of certain transactions and an inquiry was carried out."