The spinoff Solo: A Star Wars Story is due in cinemas in the UK in May.
In a photo posted on Twitter, Howard revealed the film will open with the classic line: “A long time ago in a galaxy far, far away…”
The filmmaker, who took over directing duties from Phil Lord and Christopher Miller, shared a shot of himself watching an edit of the film, in which the text can be seen.
The official Star Wars account shared the post and wrote: “We live by those 10 words,” alongside a heart emoji.
Howard’s photo was captioned: “Final stages of post on #Solo It’s gratifying to see everybody’s dedication to this story – going back to 2012 – adding up in such a fun & satisfying way. So much talent involved.”
He has posted several pictures of the final stages of the film, including a shot of a special effects review at Skywalker Ranch, the workplace of Star Wars creator George Lucas.
Hail, Caesar! actor Alden Ehrenreich will star in the film as the young Han Solo, the role made famous by Harrison Ford.
Donald Glover will also appear as Lando Calrissian, alongside Emilia Clarke, Woody Harrelson and Paul Bettany.
The movie suffered a few setbacks after the directing duo of Miller and Lord were fired by Lucasfilm last year, and replaced with Howard.
Lucasfilm chief Kathleen Kennedy said “creative differences” had led to the decision to part ways with the pair.
Solo is released in UK cinemas on 25 May.