Convert Case Mobile Apps

Convert text between cases on your phone or tablet. Paste, pick a format, and copy or share the result - no internet connection required.

Convert Case is a free mobile app for iPhone, iPad, and Android with seven case conversions, 20 Unicode font styles, a Remove Formatting tool, an Encoder / Decoder, 14 languages, and smart locale-aware formatting.

Conversions

UPPER CASE, lower case, Sentence case, Capitalized Case, Title Case, aLtErNaTiNg cAsE, InVeRsE CaSe

Fancy Fonts

Type your text and instantly preview it in 20 Unicode font styles including Script, Fraktur, Double-Struck, Circled, Squared, Small Caps, Full Width, and Monospace. Copy or share any style with one tap, and favorite the ones you use most - they float to the top and persist across sessions.

Remove Formatting

Strip extra spaces, line breaks, HTML tags, URLs, emojis, punctuation, numbers, and special characters from your text. Multi-select the cleanup options you need and apply them all at once.

Encoder / Decoder

Encode and decode text as Base64, URL percent-encoding, ROT13, UTF-8 hex bytes, HTML entities, binary, and Unicode escapes. Pick an encoding, toggle Encode or Decode, and see the result update as you type.

Features

Available in 14 languages with an in-app language picker: English (US/UK), German, Spanish, French, Portuguese, Polish, Italian, Hungarian, Slovenian, Greek, Filipino, Hindi, Turkish, and Ukrainian
Smart locale handling: German ß becomes ẞ when uppercased, Turkish dotted and dotless I rules are respected, and Title Case uses language-specific small-word lists for French, German, Spanish, and Italian
Automatic proper noun casing in Title Case, Sentence case, and Capitalized Case - 3000+ names, places, brands, and acronyms are recognized and cased correctly (NASA, iPhone, Paris, Abu Dhabi) - toggle off or add your own custom terms in Settings
Settings page for picking your language, choosing a System, Light, or Dark theme, toggling the background reminder, and enabling auto-copy
Background reminder: switch to another app with text waiting and Convert Case will quietly nudge you to come back and finish the job
Clipboard integration: one-tap paste brings text from any app straight into Convert Case, and one-tap copy (or auto-copy) sends the result back out
One-tap sharing to messages, email, or social media
Quick-launch shortcuts: long-press the app icon to jump straight into Fancy Fonts, Remove Formatting, Encoder / Decoder, or Settings without first landing on the home screen
Works offline with full functionality, every time

Privacy

All conversions are performed locally on your device. Convert Case does not collect, transmit, or store any user data.

Changelog

1.7.0 - Quick-launch shortcuts: long-press the app icon to jump straight into Fancy Fonts, Remove Formatting, Encoder / Decoder, or Settings without first landing on the home screen
1.6.0 - New Encoder / Decoder page for Base64, URL percent-encoding, ROT13, UTF-8 hex bytes, HTML entities, binary, and Unicode escapes; paste button for one-tap clipboard pasting; Auto-copy setting that sends every conversion to your clipboard; proper-noun and abbreviation toggle with support for custom terms that override the built-in casing
1.5.0 - New Fancy Fonts page with 20 Unicode font styles (Script, Fraktur, Double-Struck, Circled, Squared, Small Caps, Full Width, Monospace, and more); copy or share any style with one tap, and favorite the ones you use most
1.4.2 - New Remove Formatting page to strip extra spaces, line breaks, HTML tags, URLs, emojis, punctuation, numbers, and special characters with multi-select options
1.4.1 - New FAQs page explaining what each case conversion does
1.4.0 - Now in 14 languages with an in-app language picker, Light/Dark theme override, a notification toggle, and a new Settings page
1.3.0 - Case conversion fixes, support for 3000+ proper nouns (NASA, iPhone, etc.), stability updates
1.0.0 - Initial release

Please get in touch if you find any bugs or have any general feedback.

More ways to experience Convert Case:

Browser Extensions

iPhone/iPad App

Android App

Convert Case Mobile App

Convert text between seven case formats directly on your phone or tablet. The Convert Case mobile app is free for iPhone, iPad, and Android and includes a Fancy Fonts page with 20 Unicode font styles, a Remove Formatting tool for stripping spaces, line breaks, HTML, URLs, emojis, and more, and an Encoder / Decoder for Base64, URL percent-encoding, ROT13, UTF-8 hex, HTML entities, binary, and Unicode escapes. It supports 14 languages with smart locale-aware formatting (German ß, Turkish dotted-I, language-specific Title Case small-word lists), and automatically cases 3000+ proper nouns like NASA, iPhone, and Paris. Long-press the app icon for quick-launch shortcuts into Fancy Fonts, Remove Formatting, Encoder / Decoder, or Settings. A Settings page lets you pick your language, choose a theme, toggle the background reminder, enable auto-copy, and customize the proper-noun list. Conversions happen on-device and work fully offline.

What is the Convert Case mobile app?

The Convert Case mobile app converts text between seven case formats on your phone or tablet. Paste text from any app, pick a format, then copy or share the result. It supports 14 languages, handles locale-specific rules automatically, and works offline.

Which platforms is the app available on?

The Convert Case mobile app is available on both iOS and Android, covering iPhone, iPad, and Android phones and tablets.

How do I install the app?

Visit the Apple App Store on iOS or the Google Play Store on Android. Search for "Convert Case," select our app, and tap Install.

How much does the app cost?

The Convert Case mobile app is free to download and use.

What case conversions does the app support?

The app supports seven conversions: UPPER CASE, lower case, Sentence case, Capitalized Case, Title Case, aLtErNaTiNg cAsE, and InVeRsE CaSe. Title Case, Sentence case, and Capitalized Case automatically recognize 3000+ proper nouns (NASA, iPhone, Paris, Abu Dhabi) and case them correctly.

Which languages are supported?

The app is available in 14 languages: English (US and UK), German, Spanish, French, Portuguese, Polish, Italian, Hungarian, Slovenian, Greek, Filipino, Hindi, Turkish, and Ukrainian. An in-app language picker lets you choose any of them regardless of your device's system language. Locale-specific rules are applied automatically: German ß uppercases to ẞ, Turkish dotted and dotless I rules are respected, and Title Case uses language-specific small-word lists for French, German, Spanish, and Italian.

Does the app work offline?

Yes. All conversions run on-device, so the app works with full functionality whether you are online or offline.

How do I change the app's theme or language?

Open the Settings page inside the app. From there you can pick your language, choose a System, Light, or Dark theme, toggle the background reminder, enable auto-copy so every conversion is sent straight to your clipboard, and fine-tune the built-in proper-noun corrections by adding your own custom terms.

What are Fancy Fonts?

Fancy Fonts is a dedicated page in the app that previews your text in 20 Unicode font styles, including Script, Fraktur, Double-Struck, Circled, Squared, Small Caps, Full Width, and Monospace. Type once and every style updates as you go. Tap any style to copy or share it, and favorite the ones you use most so they float to the top and persist across sessions.

What does the Remove Formatting tool do?

Remove Formatting cleans up pasted or messy text. Multi-select any combination of cleanup options - extra spaces, line breaks, HTML tags, URLs, emojis, punctuation, numbers, and special characters - and apply them all at once.

What encodings does the Encoder / Decoder support?

The Encoder / Decoder page supports Base64, URL percent-encoding, ROT13, UTF-8 hex bytes, HTML entities, binary, and Unicode escapes. Pick an encoding, toggle between Encode and Decode, and the result updates as you type.

How do the quick-launch shortcuts work?

Long-press the Convert Case app icon on your home screen to open a shortcut menu that jumps straight into Fancy Fonts, Remove Formatting, Encoder / Decoder, or Settings, skipping the home screen entirely.

What is the background notification for?

If you switch to another app with text still waiting in Convert Case, a quiet notification reminds you to come back and finish the job. You can turn the reminder off at any time from the Settings page.

Does the app collect or share my data?

No. All conversions are performed locally on your device. Convert Case does not collect, transmit, or store any user data.

Last reviewed: April 2026