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Convert text to Sentence case: capitalize the first letter of each sentence and lowercase everything else. Auto-restores the standalone pronoun "I".
Details
Convert text into Sentence case — the style used in prose: the first letter of every sentence is capitalized, and everything else is lowercased.
How it works:
. ! ?.I'm, I'll, I've, I'd) is restored to uppercase automatically, since lowercasing it would be incorrect.Good to know:
NASA → nasa, London → london). If you must preserve them, use the Capitalize Sentences tool instead — it only touches the first letter of each sentence and leaves the rest untouched.Execution
Fill in the form, run the tool, and review the result in one place.
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Tool usage guide
The Sentence Case Converter helps you instantly format text into standard prose style by capitalizing the first letter of every sentence and converting all other letters to lowercase. It automatically detects sentence boundaries using punctuation marks and restores the uppercase spelling of the standalone pronoun "I" and its contractions, ensuring clean and readable copy.
Background
An editor receives a draft submission where the author accidentally left caps lock on for several sentences.
Problem
The text is in all-caps, making it hard to read and unprofessional.
How to use
Paste the all-caps text into the input field to automatically convert it to sentence case.
Outcome
The text is converted to standard prose, with only the first letter of each sentence capitalized and the rest in lowercase.
Background
An automated transcription tool outputs text entirely in lowercase, including personal pronouns.
Problem
The transcript lacks sentence-start capitalization and has lowercase 'i' and 'i'll' pronouns throughout.
How to use
Input the lowercase transcript into the text area to format the sentences and restore pronoun capitalization.
Outcome
The sentences start with capital letters, and occurrences of 'i', 'i'll', and 'i'm' are correctly capitalized to 'I', 'I'll', and 'I'm'.
It detects sentence boundaries using ending punctuation marks followed by a space, such as periods, exclamation points, and question marks.
Yes, because it lowercases all non-sentence-initial letters, proper nouns and acronyms will be lowercased. Use a Capitalize Sentences tool if you need to preserve them.
Yes, the tool automatically detects and capitalizes the standalone pronoun 'I' and its contractions like 'I'm', 'I'll', 'I've', and 'I'd'.
Yes, you can paste multi-paragraph text, and the tool will apply sentence case formatting across all paragraphs.
It works for any Latin-based script by capitalizing the first letter after sentence boundaries, but the specific pronoun restoration is tailored for English.