CaseWren
Now 150 free tools · No sign-up · 100% private

Convert text to any case. Instantly.

Type once and watch every style update live — then copy the one you need.

0 Characters · 0 Words · 0 Lines

Start typing to see all 17 styles live

Every conversion happens in your browser — nothing is uploaded.

Ctrl+Z UndoCtrl+Shift+Z RedoOptions and input are saved automatically in your browser.
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Browse by category

7 toolboxes, one for every kind of job.

14 tools

Case Converters

Upper, lower, title, camel, snake and every case in between.

32 tools

Font Styles

Unicode fonts for Instagram, Discord, TikTok and more.

6 tools

Text Analysis

Count words, analyze frequency, estimate reading time.

39 tools

Code & Data

Base64, URL, Morse, JSON, QR codes and ciphers.

34 tools

Text Cleanup

Remove line breaks, dedupe, sort, find & replace.

15 tools

Random Generators

Passwords, UUIDs, numbers, dates and lorem ipsum.

10 tools

Image & Media

Convert formats, extract palettes, turn images into ASCII art.

Built for speed and privacy

The small details that make a big difference.

Live as you type

Results update on every keystroke — no convert button, no waiting.

One-click copy

Every output has its own copy button with instant feedback.

Private by design

Everything runs in your browser — your text never leaves your device.

Keyboard-first

Press ⌘K to search and jump to any of the 150 tools in a flash.

Dark mode

A full light and dark theme that is easy on your eyes, day or night.

Free forever

No sign-up, no limits, no paywall. Every tool, always free.

Why CaseWren beats the old converters

The old way

  • Click a button for every single conversion
  • Wait for the page to reload each time
  • Hunt for the actual tool on cluttered pages
  • One style per page — endless tab switching

The CaseWren way

  • Results update live as you type
  • All 17 case styles on one screen, side by side
  • Your text never leaves your device
Single-purpose pages, one site per tool150 curated, deeper tools — each with real options, all in one place

What is case conversion?

Case conversion is the process of changing the capitalization of text — turning lower case into UPPER CASE, Title Case, Sentence case, camelCase, snake_case and more. Writers, developers, marketers and students rely on it daily to meet style guides, naming conventions and formatting rules without retyping a single word.

When do you need a case converter?

Any time text arrives in the wrong format: a headline typed in ALL CAPS that needs Title Case, a variable name that must switch from snake_case to camelCase, a spreadsheet column that should be Sentence case, or social copy that needs a fancy Unicode font. A good converter fixes it in seconds instead of minutes of manual editing.

Why choose CaseWren?

CaseWren shows every case style at once, updates live as you type, and runs entirely in your browser — so your text is never uploaded or stored. It is free forever, needs no sign-up, works offline once loaded, and bundles 150 curated tools from word counters to image converters in one fast place.

Further reading: Wikipedia: Letter case · Unicode Consortium: Case Mappings FAQ

Frequently asked questions