Sentence case converter

A sentence case converter is the default voice of email, documentation, and UI copy. This tool walks your paste, lowercases the body, lifts the first letter of each sentence, and restores the pronoun I. Keep smart casing enabled if you want brands and acronyms to survive the pass.

What sentence case means

Sentence case looks like ordinary prose: Only the first letter of each sentence is capitalized. Everything else is lowercase, except the pronoun I and terms your dictionary restores (NASA, iPhone, JavaScript).

It is quieter than Title Case (headline style) and quieter than Capitalized Case (every word stands). It is not lower case — the first letter of each sentence still rises.

Example:

THIS IS A HEADING. it WAS mixed UP.

→ This is a heading. It was mixed up.

When to use sentence case

Use this converter when:

• Someone sent ALL CAPS or chaotic mixed case that should read like a paragraph
• Product UI, settings, and empty states should match modern sentence-case design systems
• You drafted in Title Case and need a calmer lead or body paragraph
• Support macros and email templates should sound human, not shouty

Prefer Title Case for news headlines, book titles, and blog H1s that follow AP / APA / Chicago / MLA. Prefer Capitalized Case for names, playlists, and Start Case labels. Prefer UPPER CASE only for labels that must shout.

Sentence case vs Title Case vs Capitalized Case

Mode	Pattern	Typical use
Sentence case	First letter of each sentence	UI, email, body copy
Title Case	Style-guide headlines	Articles, docs H1s
Capitalized Case	Every word capitalized	Names, Start Case labels

For longer examples and decision rules, read title case vs sentence case vs capitalized case. For product buttons and settings, see sentence case vs title case for UI copy.

Word, Excel, and Google Docs

Word Change Case offers sentence case in some builds (lowercase with a capital first letter of the selection), but multi-sentence pastes and proper nouns are easy to get wrong. Shift+F3 cycles cases without AP-aware Title Case or brand repair.

Excel has no dedicated sentence-case formula. People chain LOWER and manual edits, or use VBA. For a one-off column of sentences, paste here and paste back.

Google Docs Capitalization tools cover lowercase, UPPERCASE, and Title case — not a robust multi-sentence sentence-case pass with smart brands.

This page is the faster path when text lives in a browser, ticket, or CMS: paste, convert, copy. Nothing leaves the tab.

How to use this tool

1. Paste the messy text into the editor (or drop a .txt file).
2. Keep smart casing on if you want NASA / iPhone / JavaScript restored.
3. Copy the result, or jump to a sibling tool — the paste stays in session storage for this tab.

Coming from Caps Lock? You may want a full uppercase to lowercase pass first, then sentence case for readability. The guide how to convert uppercase to lowercase online covers Word and Excel alternatives. For URL handles after you settle the title, continue to the URL slug generator.

Playful siblings: alternating case for aLtErNaTiNg caps and inverse case to flip existing capitalization — not for publication headlines.