Short answer
No. Joker (2019) is not a direct adaptation of a specific comic book. It is an original screenplay by Todd Phillips and Scott Silver that uses the DC Comics character and a handful of well known story beats from the character's long publishing history. Warner Bros. lists the film as an original story, not an adaptation of a titled graphic novel. The same holds for the 2024 sequel, Joker: Folie à Deux.
The confusion is understandable. The Joker has appeared in thousands of comics since 1940, so almost any plot point in a Joker film will echo something on a page somewhere. That is influence, not adaptation.
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Where the 2019 story actually comes from
Phillips has said in interviews that he pitched the film as a character study in the style of 1970s cinema, modeled on movies like Taxi Driver and The King of Comedy. Arthur Fleck is a new creation. He has no counterpart in the comics as written. His mother, his job as a clown-for-hire, the talk show climax, and the Gotham City of the film are all invented for the screenplay.
Comics that shaped the tone and details
- Batman: The Killing Joke (1988): the failed stand-up comedian origin and the idea of one bad day pushing a man over the edge.
- Batman: The Man Who Laughs (2005): the Joker as a chaotic force arriving without a clear past.
- The Dark Knight Returns (1986): the talk show setting and the media circus around a masked figure.
- Batman #1 (1940): the character's first appearance, where he is a gang boss with no origin at all.
These are reference points, not source material. No scene in the film is a panel-for-panel lift from any of them.
What the film changes from comic canon
- Origin. Comics have offered several, and DC has kept the real one deliberately unclear. The film commits to one.
- Age and setting. The film places Arthur in a gritty 1981 Gotham with no Batman active.
- Relationship to Bruce Wayne. The film hints at a connection the comics never confirmed.
- Tone. The comics swing between clownish prankster and mass murderer. The film stays in the second register throughout.
Is Joker: Folie à Deux based on a comic?
No. It is a direct continuation of the first film's original story, with a courtroom frame and musical numbers. It draws on the Arkham Asylum setting and the Harley Quinn character, both of which are comic inventions, but the plot is not adapted from a published arc.
How to check any comic adaptation claim
- Read the film's opening credits. Adaptations name the source and its creators.
- Check the studio's official synopsis. Original stories are described as such.
- Look for a matching published title. If no single book matches the plot, it is an original screenplay.
- Separate influence from adaptation. Inspired by is not the same as based on.