Guides / When to use each case

When to use each case style

Four buttons. Different jobs. Use this map so you click with intent instead of guessing.

UPPER CASE

Use for: short labels, acronyms, status chips, and systems that require all caps.

Avoid for: paragraphs, friendly email, and anything longer than a handful of words.

Tip: If the text feels angry when you read it silently, it is probably too much caps.

Use for: resetting messy input, preparing slugs or tags, and normalizing data before another transform.

Avoid for: final customer-facing sentences (unless your brand is intentionally all lowercase, which still needs care with names).

Tip: lower then Title or Sentence is the safest two-step cleanup for PASTED NOISE.

Use for: headlines, card titles, navigation labels, and slide titles.

Avoid for: multi-sentence body copy.

Tip: After converting, apply your house rules for short words. Details in Title Case rules.

Use for: articles, product blurbs, support replies, and almost all continuous prose.

Avoid for: when a design system demands Title Case on every heading level (follow the system, then stay consistent).

Tip: Re-capitalize people, places, and products after the automatic pass.

CSV column of city names in mixed caps: lower, then Title Case, then spot-check.
Blog headline: Title Case or Sentence case per brand guide; do not mix across posts.
Angry paste from a form: lower, Sentence case, fix names.
Feature flag key: lower (and keep underscores as the app expects).

Ready to transform something? Open the Case Converter. For headline vs body nuance, read Sentence case vs Title Case.