Note: These tricks are already provided by the WhatsApp and do not require any kind of special software tool to operate.
You might be tired of holding down the messages you want to quote and reply to them. Well a simple way is to just "Swipe" the text to right that you want to reply to and you will see the message gets quoted and then you can simply type in the reply.
This hack is more useful when you want to know which of the contacts or groups is taking more space of your memory storage and to eliminate unnecessary data of the contacts and Groups. This is how you can do it. Hack: Go in the Settings-->Data and Storage Usage--->Storage usage, this will give you the list of contacts and groups using up space on your device in descending order.
If you want to hide your profile picture for some reason for some time without removing it, then all you have to do is simply, Go to the Settings--> click on Privacy--> then you can set "Profile photo" to Nobody.
This is one of the best tricks of all and you might be not knowing it all the time. Hack: In Android devices this is how it works, hold the message you want the details of, three dots will come-up on the top right corner, in there click the "Info" option. This will show you the details of when the message was "Delivered" and when was it "Read". And for iOS users, all they have to do is simply hold the message and Swipe it to the right, to get the details.
We know that when a message is read by a receiver a blue tick shows below the message, however here is how you can read the message and the sender will not even know about it. Hack: Click on the Settings--> Account-->Privacy--> then, scroll down--> click--> Read Receipts this will turn off it, so the next time you read a message it will not show blue tick for others, this will happen even for other numbers. You can again turn on Read Receipts options whenever you want.