Other EastEnders stars paying tribute to the actor include Perry Fenwick (Billy Mitchell) and Natalie Cassidy, who plays Sonia Fowler.
Fenwick said: "John was a lovely, lovely man to work with. I'll miss him" while Cassidy said: "I never had a real granddad so John was like an actual granddad to me. He was a lovely man and I learnt a lot from him."
Some notable storylines from EastEnders featuring John Bardon, aka Jim Branning, included his proposal to Dot Cotton, played by June Brown, in 2001 on the London Eye.
And the reunion with his estranged son Max, played by Jake Wood.
Former EastEnders actor Dean Gaffney has taken to Twitter to pay tribute to John Bardon.
RIP John Bardon, forever in our hearts! Was privileged to not only work with you but to call you 'grandad'.... X
We're saddened to hear that actor John Bardon, who played Jim Branning in EastEnders, passed away this morning. http://t.co/k4BLpk9Gkm
Tonight's episode of EastEnders will be dedicated to the courageous, hugely talented and much-loved John Bardon. http://t.co/3eBZzEvPP7
The onscreen wife of actor John Bardon has paid tribute to him. He is understood to have died in the early hours of this morning, seven years after a debilitating stroke which has left him needing round-the-clock care in recent years.
June Brown said she hoped he was now "at peace".
I am so sorry that John has passed away but hope that he is now at peace after seven difficult years. I shall miss him very much as I loved him dearly. My thoughts are with his devoted wife Enda.
John Bardon, who starred as Jim Branning in Eastenders, has died aged 75.
He played the character from 1996 to 2011, and married character Dot Cotton in 2002.
He suffered a stroke in 2007 and was subsequently written out of the soap.
Actor Martin Shaw has called his Judge John Deed co-star Sir Donald Sinden 'a walking life force'.
Paying tribute to Sir Donald, Shaw said: "He's one of those people you just talk about with laughter and affection, and we all have our Donald impersonation to accompany our stories of him.
"He was a walking life force and it was impossible to be with him for more than a few minutes without roaring with laughter.
"I remember him with the deepest affection from the early sixties when as a student I saw him at the Royal Shakespeare Company, through to our years together on Judge John Deed. We've lost one of the greats.
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Alan Titchmarsh is to make his West End debut in the Wind In The Willows.
The green-fingered broadcaster will narrate the show, which will be run at the Vaudeville Theatre from November 26.
The production, created by the Royal Opera House, was handed an Olivier Award for the best entertainment show during an earlier run at London's Duchess Theatre.
The former Gardeners' World star said: "I am thrilled and delighted to be joining this tremendous production which celebrates my all-time favourite children's book. Poop poop."
The Royal Shakespeare Company has said it is "saddened" to hear the news of the death of Sir Donald Sinden.
Sir Donald performed with the RSC in leading roles such as King Lear and Malvolio in Twelfth Night. His last appearance with them was as part of a special performance in 2007.
He also had more than 70 credits for film and TV productions.
Paying tribute Gregory Doran, RSC Artistic Director, said: "Donald liked to say that “Man cannot live by Bard alone”, and his extraordinary career outside the RSC in films, and television will no doubt be amply recorded elsewhere."
He added: "One thing of which you can be certain, is that all over the country this morning, people are regaling each other with one or other hilarious Donald Sinden anecdote, and that, alongside his great talent, is his wonderful gift to us all".