Does it handle accented characters?

Yes. The converter uses the JavaScript String.toUpperCase routine, which correctly uppercases é to É, ñ to Ñ, and other Unicode letters.

What about Turkish dotless i?

By default the conversion is locale-independent, so "i" becomes "I" rather than the Turkish "İ". For Turkish text, lowercase the result manually if you need locale-correct behaviour.

Is my text sent to a server?

No. The conversion runs in your browser using a single function call; nothing leaves your machine.

Unicode-aware · live · zero-config

Convert text to UPPERCASE

Pure JavaScript String.toUpperCase() — Unicode-aware, locale-default. Live preview, copy, and download.

UPPERCASE Converter Workspace

Input size

44 B

9 words

Output size

44 B

same chars, uppercased

Transform

UPPER

.toUpperCase()

Locale

default

Unicode-aware

input · text

output · UPPERCASE

THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.

Quick Start

How to convert text to UPPERCASE

The simplest case transformation — every alphabetic character becomes its uppercase form. Unicode-aware (handles accented letters, non-Latin scripts) via the browser's native String.toUpperCase().

01
Paste text
Any text — sentences, identifiers, code.
Tokenisation is Unicode-aware via \p{L}\p{N} property classes — so accented letters, ideographs, and emoji code points all count correctly.
any textUTF-8Unicodecode pointslive
input · textraw · UTF-8
```
hello world
```
loaded · UTF-8UTF-8 · ready
02
Auto-uppercased
Every alphabetic character is converted. Non-alphabetic (digits, symbols, whitespace) is unchanged.
Live re-counts run on every keystroke through a memoised reducer, so even multi-megabyte inputs stay smooth in the editor.
livememoisedoptionssnappy
output · optionsuppercase · live
```
HELLO WORLD
```
options applied · livelive
03
Unicode handling
Accents and non-Latin scripts (Greek, Cyrillic) are handled correctly by the browser's Unicode-aware case folding.
Output preserves the original line endings (\n vs \r\n) and trailing whitespace is reported separately so you can spot diff-only changes.
Unicodeline endingswhitespacediff-cleanreproducible
Unicode · countedcafé · ready
```
CAFÉ
```
counted · livecounted
04
Copy or download
Copy with one click or download as plain text.
Copy writes via the Async Clipboard API; downloads ship as text/plain; charset=utf-8 — nothing leaves your tab.
copyclipboardtext/plainblobclient-side
export · copiedready · done
```
✓ Copied
```
shipped · ready to shipsuccess

Pro tips

Text-processing fundamentals worth knowing

Tokenise with Unicode classes

Use \p{L}\p{N} with the u flag so accents, ideographs, and emoji count properly.

Normalise line endings

Convert \r\n to \n before diffing or hashing — Windows-vs-Unix endings produce phantom changes.

Mind invisible characters

Zero-width joiners, BOMs, and non-breaking spaces look identical to ASCII space. Strip them before comparison or storage.

Stream don’t slurp

For multi-megabyte text, iterate line-by-line rather than loading everything to memory — keeps the tab responsive.

Choose collation deliberately

Default JS sort is code-point order, not human alphabetical. Use Intl.Collator for locale-aware sorting.

Re-run after normalisation

NFC vs NFD changes byte length but not visible glyphs. String.prototype.normalize() before counts and comparisons.

Use Cases

When to UPPERCASE

Anywhere you need ALL CAPS.

Headlines

All-caps headlines and CTAs for emphasis. Tokenisation uses Unicode property classes (\p{L}, \p{N}) with the u flag so accents, ideographs, and emoji code points all count correctly. Surrogate-pair-aware counts mean 🚀 weighs 1, not 2.

Unicode-correct

Constants

Normalize env vars and constants to SCREAMING_CASE. Result updates as you type — paste and watch totals settle in milliseconds even on multi-megabyte inputs. Heavy work runs through a memoised reducer so the editor never janks.

diff-clean

Forms

Normalize names or codes (e.g. country codes) to uppercase. Output normalises line endings to LF for clean diffs across platforms. Windows-vs-Unix CRLF mismatches disappear, which keeps git blame honest and review comments focused on real changes.

instant counts

Emphasis

Sprinkled into copy for stress (sparingly). Code-point counts are stable across NFC/NFD normalisation. Pair with the Reading Time Calculator to layer scan-time on top of raw counts, useful for editorial budgets and SEO meta-description limits.

platform-aware

Acronyms

Verify all acronyms are uppercased in a draft. All processing runs client-side — paste sensitive or pre-publish copy without it leaving the tab. The clipboard API writes UTF-8 text/plain so it survives transit to any editor or CMS.

code-point-accurate

ID normalization

VAT numbers, postal codes, license plates. Same input plus same options always produces identical output, so the tool is safe to embed in CI scripts or doc-generation pipelines without race conditions.

lossless

FAQ

Frequently asked questions

Is it Unicode-aware?

Yes — uses JavaScript's String.toUpperCase() which respects Unicode (accents, Greek, Cyrillic, etc.).

Does it lose information?

Only via German ß → SS (one-to-many). Otherwise idempotent — running twice yields the same result.

What about Turkish I/ı?

Default toUpperCase doesn't apply Turkish rules. Use toLocaleUpperCase('tr') in code if needed.

Is anything sent to a server?

No. All processing runs locally.

Where's the more complex case converter?

See Case Converter for 11 cases including camelCase, snake_case, kebab-case.

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