AI Text Cleaner · Guide

Remove Zero-Width Characters from Text

Last updated: August 28, 2026

Zero-width characters are the invisible contamination AI text picks up during copy-paste. They don't show on screen, but they break search, regex and string comparisons. Here's how to detect and remove them — without breaking your emoji.

What are zero-width characters?

• Zero-width space (U+200B) — an invisible space; the most common offender in AI output
• Zero-width joiner (U+200D) — joins characters; needed for emoji like 👨👩👧👦, junk elsewhere
• Zero-width non-joiner (U+200C) — prevents joining
• Word joiner (U+2060) — invisible, prevents line breaks
• BOM (U+FEFF) — often appears at the start of copied text

Where they come from

Chat interfaces, PDFs and some editors silently insert zero-width characters. AI platforms add their own formatting layer, and the copied result frequently carries U+200B or U+FEFF you can't see. The text looks fine — until a search query, a regex or a database constraint fails mysteriously. Zero-width characters are part of the wider invisible-character family — see the full invisible character remover →

The emoji trap in zero-width removal

Zero-width joiners are a special case: they're invisible characters, but they're also what keeps multi-part emoji together. A blunt remover strips U+200D everywhere and 👨👩👧👦 collapses into 👨👩👧👦. ClearPaste removes zero-width characters except the joiners inside emoji sequences — so your text is clean and your emoji survive.

How to remove zero-width characters

1. Paste your text into the cleaner above.
2. On the homepage tool, hit Reveal hidden to see each ZWSP/ZWJ/BOM labeled in place.
3. Copy the clean text — it's ready for search, code or your CMS.

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

The five zero-width characters you'll actually meet

U+200B and U+FEFF are the ones that cause almost all the practical problems. The joiner (U+200D) is special: it's a legitimate part of emoji, so ClearPaste keeps it where it belongs.

How to spot them before you remove them

• Reveal hidden on the ClearPaste homepage labels each one in place — ZWSP, ZWJ, BOM, SHY, LRM and the rest.
• Regex — /[\u200B\u200C\u200D\u2060\uFEFF]/g finds the common set in any text editor that supports regex search.
• A hex editor or an online codepoint inspector — paste a suspicious string and look for characters with no visible glyph.

The tell: if a string looks identical but behaves differently (search, regex, comparison), zero-width characters are the first suspect.

What breaks when you leave them in

• Exact-match lookups — an ID or email copied from a chat window with a hidden U+200B won't match the database row.
• Length limits — a field that rejects "too many characters" may actually be counting invisible ones.
• Analytics and deduplication — the same content stored with and without hidden characters becomes two rows, two tags, two URLs.

Zero-width characters are the most common piece of the wider invisible-character problem — see the full remover →

Frequently asked questions