Invisible characters
0
Characters worth inspecting, normalizing, or preserving.
Text Hygiene
Inspect hidden Unicode formatting, clean accidental characters, and review prose for vague or formulaic patterns. Every check is deterministic and runs in this browser tab.
Private by default: your text is never uploaded, logged, or stored. This
static page contains no model API and sends no content to a server.
What this tool is not: it is not an AI detector and it does not remove or
test proprietary model-level watermarks. A style flag is not proof of authorship. Preserve
any disclosure or provenance information required by your school, employer, publisher, or law.
Inspect and improve text
Ready. Paste text and choose Analyze text.
Writing observations
0
Rule-based prompts for human review, not an authorship score.
Invisible-character report
No tracked invisible characters found.
| Position | Code point | Character | Review |
|---|
Writing-quality review
Based on observable style patterns such as filler, vague attribution, inflated wording, chatbot scaffolding, and repeated em dashes. Context matters; review rather than blindly accept.
No tracked style patterns found.
Reviewable output
Cleanup preserves emoji joiners, variation selectors, and script-shaping joiners by default. Writing edits only shorten a small set of exact filler phrases; they do not invent facts.
When do you need to remove invisible characters?
Invisible Unicode characters rarely show up in the text you type yourself. They sneak in when text is copied, converted, or generated elsewhere — and then they break things in ways that are hard to see. Four situations come up most often:
- Forms, validation, and exact matches. Invisible characters inflate character counts and break length checks, regex validation, exact-match lookups, and file names. A 500-character field can “look” shorter than it is, and a filename that contains a zero-width space will never match the string you typed.
- Copy-paste from web pages and chat apps. Text copied from websites, office documents, or chat interfaces often carries no-break spaces, soft hyphens, and bidirectional marks that behave differently from ordinary spaces — no line breaks, odd ordering, or invisible joins between words.
- AI-generated text cleanup. AI assistants and their rendering pipelines sometimes emit invisible Unicode characters such as zero-width spaces, soft hyphens, or a byte order mark. Removing them returns the text to ordinary, predictable plain text for editing, publishing, or further processing. This is formatting cleanup — it does not alter authorship signals or watermarks.
- Pipelines, spreadsheets, and code. Invisible characters break deduplication, tokenization, CSV columns, string comparison, and LLM or RAG preprocessing — a chunk containing U+200B will not match the same string without it. Use this page to see exactly what is in the text before you script around it.
A worked example, step by step
Suppose a colleague pastes this line into a chat message, and you copy it into an email:
The revised␣U+200B pricing sheet is attached.␣U+00A0Please review it before Monday.␣U+200B
- Paste the text and choose Analyze text. The inspector reports 3 invisible characters: zero width space at positions 12 and 72 (cleanup) and no-break space at position 40 (normalize).
- Choose Clean invisible formatting. The cleanup removes the two zero-width spaces and normalizes the no-break space to an ordinary space: 2 removed, 1 normalized, 0 preserved.
- Review the output. The result is “The revised pricing sheet is attached. Please review it before Monday.” — identical to what the sender appeared to write.
The same cleanup is deliberately conservative with characters that can change meaning: the emoji 👨💻 stays intact because its zero-width joiner (U+200D) is preserved, not removed.
Capabilities and limits
- Unicode inspection: reports zero-width characters, special spaces, bidirectional controls, soft hyphens, joiners, mathematical invisibles, and variation selectors.
- Conservative cleanup: removes common accidental controls, normalizes special spaces, and preserves characters that can change emoji, mathematical notation, or complex-script spelling.
- Style review: flags selected patterns described in Wikipedia's observational field guide. Those patterns also occur in human writing and are not evidence by themselves.
- No watermark bypass: model-level statistical watermarks are encoded through token-selection patterns, not necessarily hidden Unicode. This tool cannot identify or remove them.
- No C2PA removal: file provenance metadata is outside this text-only tool's scope.
Method and sources
The writing review adapts a small, transparent set of observations from Wikipedia's “Signs of AI writing” field guide. Wikipedia itself warns that these are descriptive clues, not rules or reliable proof. Unicode names and behavior follow the Unicode Standard.
Anthropic's public documentation says supported Claude models use an imperceptible, model-level text watermark and C2PA metadata for supported files, but it has not published its detector or enough technical detail for independent implementation. This page therefore makes no Claude-removal or detection claim.
Frequently asked questions
What counts as an invisible character here?
The inspector tracks zero-width characters (zero width space U+200B, word joiner U+2060), special spaces (no-break space U+00A0, narrow no-break space U+202F, ideographic space U+3000), bidirectional controls (U+202A–U+202E, U+2066–U+2069), the soft hyphen (U+00AD), the byte order mark (U+FEFF), and a few rarer formatting characters. Tabs, line breaks, and ordinary spaces are not flagged.
Does this tool remove AI watermarks or make text undetectable?
No. Model-level statistical watermarks are encoded through token-selection patterns, not hidden Unicode characters, so this tool cannot identify or remove them. Removing invisible characters also does not change how a statistical detector would score the text. This page is not an AI detector and makes no detection or evasion claim — preserve any disclosure or provenance information your school, employer, publisher, or the law requires.
Will cleanup ever change my visible text?
Cleanup only removes characters marked as accidental (for example zero-width spaces and soft hyphens) and normalizes special spaces to ordinary spaces. It preserves characters that can change visible meaning: emoji and script joiners (U+200C, U+200D), variation selectors, and mathematical invisibles. The output is always shown for review before you copy it.
Why does pasted text contain invisible characters in the first place?
Copy-paste from web pages, office documents, chat apps, and AI-generated output can carry formatting controls — no-break spaces from justified layouts, soft hyphens from hyphenation, language marks from editors, and zero-width characters from text pipelines. In almost all cases they are accidental.
Is my text uploaded anywhere?
No. Everything runs in this browser tab on a static page. The tool makes no network submission of your text — before you accept analytics consent there are zero external requests, and even with analytics enabled no text content is ever sent.
Can I keep some of the flagged characters?
Yes. The report lists every finding with its position, Unicode code point, and risk level (cleanup, normalize, review, or preserve). Cleanup applies the conservative default — remove accidental controls, normalize special spaces, preserve everything that can change meaning — and you review the output before copying.
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