Learn when automatic capitalization helps — and when to fix proper nouns manually — in our Capitalize Sentences guide.
How to capitalize sentences automatically
Voice dictation, OCR scans, and ALL-CAPS drafts often produce text where sentence starts are lowercase or uniformly uppercase. This tool walks your paste, finds sentence boundaries, and uppercases the first letter of each sentence while leaving the rest of each word as you typed it.
- Paste mixed-case text — enter the source copy in the input textarea.
- Click Capitalize now — the output panel fills with corrected sentence starts.
- Review the result — proper nouns and acronyms you already capitalized are preserved where possible.
- Copy output — send the cleaned text to email, CMS, or your manuscript.
- Clear to start over — reset both panels for the next snippet.
What counts as a sentence boundary?
The tool treats a new sentence as beginning after terminal punctuation — a period (.), question mark (?), or exclamation point (!) — followed by whitespace and the next character. The first character of the pasted block is also capitalized when it is a letter.
| Input pattern | Typical result |
|---|---|
hello world. next idea. |
Hello world. Next idea. |
really? yes! |
Really? Yes! |
| ALL CAPS PARAGRAPH | First letter of each sentence uppercased; other letters unchanged. |
Abbreviations like e.g. or decimal numbers can occasionally look like sentence breaks in edge cases. Proofread output when your source contains many abbreviations, URLs, or citation-style periods.
When to use this tool
- Dictation cleanup — mobile speech-to-text often lowercases sentence starts.
- Scanned PDF text — OCR exports frequently need sentence-case normalization.
- Social reply threads — merge fragmented messages into readable paragraphs.
- Student drafts — quick pass before grammar review in a word processor.
This utility adjusts sentence-initial capitalization only. It does not title-case headings, fix i → I, or apply Chicago-style proper-noun rules — handle those in a dedicated editor or the next manual pass.
Privacy note
Capitalization runs locally in your browser. Input and output text never leave your device or touch ShoutingNow servers. Clear both textareas on shared machines when working with private correspondence.
Related writing tools
- Full guide article for this tool
- Writing Tools Playbook — when to use each utility
- Character Counter
- Grammar Checker
- Edit Counter