Case Converter
Switch between UPPER, lower, Title and Sentence case in one click — fix copy from any source.
What is Case Converter?
Someone sent you a doc in ALL CAPS or with bROkEn caps and you need it presentable. Retyping every sentence is the slowest fix possible.
Paste the messy text, pick the case you want and the result appears instantly.
If you're cleaning client copy, you fix capitalization in seconds. If you're formatting headlines, you switch between Title Case and sentence case to compare. If you're prepping data for import, you normalize case to keep databases consistent.
How to use Case Converter
Four steps. No setup, no signup.
Step 1
Paste your messy or shouty text
Step 2
Pick the target case — UPPER, lower, Title or Sentence
Step 3
Review the converted output
Step 4
Hit Copy and paste it where you need it
Example
One messy line, four clean cases.
Input
hELLO worLD from TOOLKNO
Output
UPPER: HELLO WORLD FROM TOOLKNO lower: hello world from toolkno Title: Hello World From Toolkno Sentence: Hello world from toolkno
Why Case Converter is useful
- ✓
Switch between four common cases in one click.
- ✓
Fix client copy that came in shouty caps or random caps.
- ✓
Keep headlines consistent across your blog and CMS.
- ✓
Normalize SKUs, slugs and database fields fast.
Common questions
What's the difference between Title Case and Sentence case?
Title Case capitalizes most words. Sentence case only capitalizes the first word and proper nouns.
Tip: Most blog headlines use Title Case; modern web prefers Sentence case.
Will it preserve acronyms like NASA?
Standard conversion may lowercase them in Title or Sentence mode.
Tip: Manually fix acronyms after conversion if precision matters.
Does it handle non-English text?
It works on most Latin alphabets. Locale-specific rules (Turkish 'I') need a dedicated tool.
Tip: Test with one paragraph before converting an entire doc.
What does Toggle Case do?
It flips every uppercase letter to lowercase and vice versa.
Tip: Use it as a fast prank or to undo accidental Caps Lock.
Last reviewed: April 2026 · Free, browser-based, no signup.
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