# Should sound effects be in all caps in a screenplay? > Capitalize a sound, prop, or action only when it has to jump off the page, and a speaking character's name at first appearance, so capitals still mean something. Sources reviewed: 2026-09-22 Article updated: 2026-09-23 ## Direct answer Capitalizing a key sound in action — a door that SLAMS, a phone that RINGS — is a common way to make it land, and many writers do the same for a prop the story turns on. It is emphasis, not a requirement: use it sparingly, because a page full of capitals stops signaling anything. Separately, a speaking character's name is conventionally capitalized the first time they appear. ## On the page Capitals rationed to what the audience must register ``` INT. ARCHIVE - NIGHT Mara lifts the blue box. Something inside RATTLES. Down the corridor, a door SLAMS. ELI (40s, rain-soaked, out of breath) fills the doorway. ELI Put it down. ``` ## Current practice ### Capitals are emphasis, so ration them _Common choice_ Final Draft's guidance names key sound effects, props, and actions as fair game for capitals and warns that overuse slows the read and dilutes the emphasis. A reader skimming only the capitals on a page should get its most important sounds and objects. ## Accepted variations ### Key sounds _Common choice_ Capitalize the sound word itself — SLAMS, RATTLES — when the audience must register it: a clue, a threat, or the cue for what happens next. ### Character introductions _Widely expected_ A speaking character's name in capitals at first appearance is one of the most consistent feature-script conventions. After that the name returns to normal case in action. ### Heavier or lighter by writer _Changing practice_ Some writers capitalize more freely to drive the pace of an action-heavy scene, while others leave sound capitals out entirely. Both are current practice; what matters is that the choice reads as deliberate. ## Where reasonable writers disagree Some writers see capitalized sounds as a holdover from shooting scripts and leave them out of a spec; others use them as a rhythm tool. Neither choice is wrong. What reads as careless is inconsistency — capitals that appear for trivial sounds and vanish for important ones. ## Mistakes to avoid - Capitalizing every sound, prop, and verb until nothing stands out. - Using capitals for emphasis inside dialogue, where they read as shouting. - Skipping the capitals on a speaking character's first appearance, or repeating them at every entrance. - Letting capitals stand in for writing the sound vividly. ## Submission versus production ### Submission or reading draft In a spec, capitals should make the read faster, not louder. Capitalize the few sounds and objects that turn a scene and let the rest of the action carry itself. ### Production draft Capitalized sounds and props can help departments find what a scene needs, but the production's own breakdown decides what is pulled. Keep emphasis consistent once pages circulate so revised pages match the ones already in use. ## Working in Plot In Plot, capitals in Action are yours to place: type SLAMS or RATTLES wherever a sound has to land, and a new character's name in capitals at first appearance. Scene headings, character cues, and transitions go to capitals on their own as you write and in the PDF, so the only capitals in your action lines are the ones you chose. ## Questions writers ask ### Do sound effects have to be capitalized in a screenplay? No. Capitalizing a key sound is a common convention for emphasis, not a formatting rule. Use it for the few sounds the audience must register and leave ordinary sounds in normal case. ### Why is a character's name capitalized the first time they appear? It flags a new speaking character for the reader and for casting. After that first introduction, the name returns to normal case in action; the character cue above dialogue is always in capitals. ### Should props be in all caps? Only when a prop matters to the story — the weapon, the letter, the key. Shooting scripts sometimes capitalize more for the props department, but a spec reads better when capitals are saved for what turns a scene. ## Sources and context - [Final Draft — Concise action lines and when to use capitals](https://www.finaldraft.com/blog/maximizing-impact-with-concise-action-lines-in-final-draft) - [Final Draft — Screenplay formatting and elements (capitalization)](https://www.finaldraft.com/learn/screenplay-formatting-elements/) - [Final Draft's guidance on capitals in action lines](https://www.finaldraft.com/blog/maximizing-impact-with-concise-action-lines-in-final-draft) These sources document current screenplay practice, software guidance, or production workflow. Screenplay style remains flexible, and any delivery brief or submission rule supplied by the recipient takes precedence. ## Where to go next - [Free script breakdown tool](https://www.inkwell.software/tools/script-breakdown): Collects the words a draft capitalizes in action into a list of candidate props, next to cast, locations, and eighths — in your browser. Common sound words such as SLAM are left out. --- Canonical page: