How To Check Your PF Balance/Passbook
EPFO on its website has prominently displayed the link to check e-passbook. It can be found at the top right corner of the website. Click on the e-passbook link.

(A snapshot of EPFO website)
This will take you to a webpage where you need to key in your UAN id and password. UAN is a unique number assigned to an employee. It acts as a marker for EPFO services. Enter the UAN and password.

You are then taken to a webpage where you can see the member-ids linked to your UAN. You need to click on the member-id for which you want to view the e-passbook and other details.

EPFO on its website shared this note for subscribers who want to check their EPF balance and passbook through this facility.
This facility is to view the Member Passbook for the members registered on the Unified Member Portal.
Passbook will be available after 6 hours of registration at Unified Member Portal.
Changes in the credentials at Unified Member Portal will be effective at this Portal after 6 hours.
Passbook will have the entries which has been reconciled at the EPFO field offices
Passbook facility not be available for the exempted establishments members / settled members /Inoperative members
Checking EPF Balance Via EPFO's m-Sewa app
Subscribers can also quickly check their passbook/balances through EPFO's app. EFPO subscribers need to click on MEMBER and thereafter Balance/Passbook and then enter their UAN number and password.

(A snapshot of EPFO's e-epf app)
Other Developments
Retirement fund body Employees' Provident Fund Organisation (EPFO), which manages your EPF money, has introduced a new facility for its subscribers to link their UAN with Aadhaar online. "This, in turn, would facilitate the members, a better and speedy EPFO services," the retirement fund body says in a statement. EPFO has made this facility available at its website www.epfindia.gov.in.
Individuals can submit claims directly to EPFO without employers.There are many Benefits of Aadhaar backed UAN. pic.twitter.com/4VnNZ7b5s4
— EPF INDIA (@socialepfo) August 25, 2017
EPFO in a recent tweet highlighted the benefits of seeding your EFP account with Aadhaar number. The benefits include submitting claims directly to EPFO without employers' attestation, receiving monthly updates on the mobile number registered with your UAN and download e-passbook and checking your passbook balance and other details.