Inspect any Unicode codepoint
Paste a character or codepoint (U+1F600, 0x1F600, 128512, hex) and see UTF-8 bytes, UTF-16 units, block name, HTML entities, and JS escapes. Click any field to copy.
How Unicode encoding works
Every char has a codepoint (U+…). UTF-8 encodes each codepoint as 1-4 bytes; UTF-16 uses 1 or 2 16-bit code units (surrogate pair for > U+FFFF).
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Paste input
Char, U+ notation, hex, decimal — all parsed.
Inputs are treated as UTF-8 throughout the pipeline and validated client-side as you type — nothing dispatches until the value is well-formed.
inpututf-8client-sidevalidatedinput · textU+1F600 · set😀
loaded · parsedclient-side - 02
Read encoding
UTF-8 bytes, UTF-16 units shown side by side.
Each toggle re-computes through a memoised hook, so flipping options never resets your input and the UI stays snappy on large inputs.
encoptionslivememoisedtogglesutf-8 · memoised4 bytes · liveF0 9F 98 80
options set · memoisedlive - 03
Check block
Unicode group helps identify origin.
Randomness — where used — comes from
crypto.getRandomValues, neverMath.random. Heavy work sits inuseMemo.blockcomputeinstantlocaldeterministicblock · instantemoticons · computedEmoticons
computed · instantinstant - 04
Copy escape
JS escape, HTML entity, HTML hex — click to copy.
Copy writes through
navigator.clipboardand downloads use aBlob— zero network traffic. Same input plus same options always yield the same bytes.exportcopydownloadzero-networkreproducibleok · copiedready · copied\u{1F600}shipped · ready to shipsuccess
Pro tips for everyday utilities
Reach for crypto.getRandomValues
Cryptographically random for IDs, tokens, salts. Math.random is for animation and games, not security.
Mock data with seeds
Faker-style libraries can be seeded so tests are reproducible. Embed the seed in the fixture file.
Reference cards beat memory
Cheatsheets for Vim, Git, Docker, Linux signals are faster than man pages when you’re mid-flow.
Browser APIs vary
Touch events, gamepads, and clipboard differ across vendors. Feature-detect before use.
Persist in the right place
localStorage for user preferences, sessionStorage for transient state, IndexedDB for structured data.
When to inspect codepoints
Debug encoding bugs, copy escapes, learn Unicode.
Encoding bugs
Identify mojibake from UTF-8/UTF-16 mismatches. Random values come from crypto.getRandomValues — cryptographically secure for tokens, salts, and session IDs. Math.random is deterministic enough for animations but predictable enough to be a security bug.
CSPRNG-backedRegex tooling
Get the right JS escape for a Unicode regex. Pair with hashids, ULID, or UUID v7 when you need both random and sortable — useful for primary keys, public-facing IDs, and event log ordering without a sequence column.
reproducibleHTML entities
Copy Ӓ or Ӓ forms. Output is deterministic given the same seed, so fixtures and tests stay reproducible across CI runs and contributor machines. Embed the seed in the fixture file for full replay.
snappySurrogate handling
Verify your code handles supplementary planes. Heavy work runs through useMemo so the UI stays snappy on large inputs. Same input + same options yields identical bytes — the kind of stability snapshot tests rely on.
i18nBlock lookup
Confirm what writing system a char belongs to. Storage tools persist to the right backend: localStorage for user preferences, sessionStorage for transient state, IndexedDB for structured data. Pick the right shelf and quota worries disappear.
deterministicChar inventory
Audit allowed characters in a text field. Browser feature detection: clipboard, fullscreen, gamepad, and Web Bluetooth APIs gracefully fall back when unavailable. No surprise white screens on Safari or older Firefox.
production-readyFrequently asked questions
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