Yes, you can play guitar online for free without a real guitar on hand now.
Thanks to musician Les Paul, who was "a pioneer in the development of the solid-body electric guitar which made the sound of rock and roll possible".
To celebrate Les Paul’s 96th birthday, Google launched a special doodle, with which you can play guitar online, as what you can see from the above image.
The doodle was so welcome that Google kept it for one more day on its homepage ( Google.com ), and later put it on a particular logo page, on which you can play guitar online for free as long as the Pac-Man doodle.
On the special logo page, you can play guitar directly by dragging the strings with the cursor, like that you are playing with a real guitar via your fingers.
Besides, you can also record your work, up to 24 seconds, and then share it with a goo.gl URL. But if you are in China or some other countries which block the goo.gl domain, you may fail to get the URL, unless you use a VPN or Proxy service.
And I have no idea how long the record will be kept in Google’s webpage, but you can record your guitar music down with any of these free online voice recorders.