Invisible Characters Cleaner
Invisible Characters Cleaner: Scans for non-printing Unicode codepoints (U+200B, U+200C, U+200D, U+FEFF, U+00AD) and strips them.
About this invisible characters cleaner
Invisible Characters Cleaner — browser-based utility.
How this tool works
Implements client-side Invisible Characters Cleaner operations. Scans for non-printing Unicode codepoints (U+200B, U+200C, U+200D, U+FEFF, U+00AD) and strips them specifically designed for a software engineer strips hidden zero-width spaces and byte order marks (bom) copied from rich-text pdfs.
- Invisible Codepoint Detection: Scans character codepoint ranges against Unicode formatting categories (Cf, Cc), highlighting hidden characters.
- Unicode Normalization: Applies selected normalization form (NFC canonical composition, NFD decomposition, NFKC/NFKD compatibility).
- Pangu Spacing Heuristics: Evaluates character-pair boundaries via regex lookaheads, injecting half-width spaces between CJK ideographs and alphanumeric ASCII.
- Whitespace Collapsing: Cleans repeated spaces, trailing line spaces, and redundant blank lines according to user settings.
Worked example
Scenario: A software engineer strips hidden zero-width spaces and Byte Order Marks (BOM) copied from rich-text PDFs.
Sample input:
Processing: Scans for non-printing Unicode codepoints (U+200B, U+200C, U+200D, U+FEFF, U+00AD) and strips them.
Illustrative output:
Limits and verification
Does not alter intentional whitespace within code blocks when code-preservation mode is selected. Carefully preserves directional formatting markers (RLM/LRM) when bi-directional Arabic/Hebrew text is explicitly preserved.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
- The Unicode Standard Version 15.1
- Standard Browser Web API / Algorithm Implementation (No single external RFC/ISO standard)
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Enter, paste, or select your input data into the Invisible Characters Cleaner workspace controls.
- Review available parameter fields, units, formats, or options configured for your task.
- Click the action button or observe immediate live calculations rendered in your browser runtime.
- Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.
Frequently asked questions
Which characters does Invisible Characters Cleaner remove?+
It removes U+200B through U+200D and U+FEFF from the supplied text, leaving all other characters and whitespace unchanged.
What did the browser fixture verify?+
The input a plus U+200B, b plus U+FEFF, and c became the visible text abc.
Does it detect every unusual Unicode character?+
No. Its regular expression only covers that small zero-width/BOM range. Other format controls, bidi markers, variation selectors, nonbreaking spaces, and confusables remain.
Can cleaned text restore deleted invisible data?+
No. Removal is destructive in the resulting text. Keep an original copy when hidden markers may carry intentional content or evidence.