Pecker is a key witness in the case against the former US president, who is accused of falsifying business records to cover up hush-money payment
Thousands of people took to the Down Detector website to report issues with Gmail and other Google services.
The social media platforms were also flooded with such messages.
"GMAIL IS DOWN. I can't decide if this is wonderfully liberating or wildly stressful," posted one user on Twitter.
"Can't send emails, at the same time when you try to compose an email, saving to draft fails too," another commented.
This is the second time in two months that Gmail suffered such a massive outage.
In July, Google users had a harrowing time in India as Gmail services went down for hours.
"Only can send emails with nothing in them (no text or attachment) - a blank email with a title gets through. I've tried different accounts, different networks, different equipment," posted another Twitter user.
The users also reported problems with loading attachments and links in Gmail.
Pecker is a key witness in the case against the former US president, who is accused of falsifying business records to cover up hush-money payment
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