Google has tripled the amount of free data capacity to 15GB, across Google+, Drive and Gmail.

The internet search giant made the announcement days before its I/O conference, giving users the biggest free storage capacity across the free online-storage services.

"Life gets a bit easier when your Google products work well together—whether that’s inserting a Drive file into an email or sharing a photo from Drive on Google+," wrote Clay Bavor, director of Product Management, Google in the company's official blog post.

"As this experience becomes more seamless, separate storage doesn’t make as much sense anymore.

"So instead of having 10 GB for Gmail and another 5 GB for Drive and Google+ Photos, you’ll now get 15 GB of unified storage for free to use as you like between Drive, Gmail, and Google+ Photos."

With this new combined storage space, Google says users won’t have to worry about how much you’re storing and where.

"For example, maybe you’re a heavy Gmail user but light on photos, or perhaps you were bumping up against your Drive storage limit but were only using 2 GB in Gmail," Bavor wrote.

"Now it doesn’t matter, because you can use your storage the way you want."

At present Google leads the way against Microsoft (7GB) Apple, Amazon and Sugar Sync (all 5GB) and Dropbox (2GB) but still falls way behind Kim Dotcom's Mega at 50GB.