NEOKYRU
NEOKYRU Free Online Tools
Email Tools
100% Client-Side All obfuscation algorithms run 100% locally in your browser memory.

Anti-Spam Email Obfuscator & Crawler Cloaker

Protect your email address from scrapers and harvesting bots using 5 encoding and CSS defense techniques

Email Security, Protocols & Headers Studio

MIME header forensics, SPF/DKIM/DMARC analysis, and anti-spam obfuscation

Anti-Scraper Email Cloaker

Web spiders and spam harvesting bots scrape static HTML to build spam lists. Cloaking converts plaintext addresses into encoded entities or JS structures that human readers view effortlessly.

HTML Decimal Entities

Converts ASCII characters into e decimal entities standardly decoded by browsers.

Generated Code:
contact@mycompany.org
Browser rendering preview:contact@mycompany.org
HTML Hexadecimal Entities

Encodes letters into e hex characters to evade naive scraping bots.

Generated Code:
contact@mycompany.org
Browser rendering preview:contact@mycompany.org
JavaScript Safe Injector

Renders dynamic DOM link via String.fromCharCode to defeat static scrapers.

Generated Code:
<script type="text/javascript"> document.write(String.fromCharCode(99,111,110,116,97,99,116,64,109,121,99,111,109,112,97,110,121,46,111,114,103)); </script>
Browser rendering preview:contact@mycompany.org
CSS Bi-directional Reverse

Writes characters backwards in DOM with CSS unicode-bidi:bidi-override;direction:rtl.

Generated Code:
<span style="unicode-bidi: bidi-override; direction: rtl;">gro.ynapmocym@tcatnoc</span>
Browser rendering preview:gro.ynapmocym@tcatnoc
URL Percent Encoded

Converts to %63%6f%6e... for mailto hyperlinks.

Generated Code:
%63%6F%6E%74%61%63%74%40%6D%79%63%6F%6D%70%61%6E%79%2E%6F%72%67
Browser rendering preview:contact@mycompany.org

About Anti-Spam Email Obfuscator & Crawler Cloaker

Client-side email cloaking and obfuscation utility. Conceals public contact emails on websites from malicious web crawlers, spambots, and scrapers using HTML decimal entities, hexadecimal entities, JavaScript String.fromCharCode injectors, and CSS bi-directional text reversal.

Key Capabilities & Features

  • 5 crawler defense techniques: HTML Decimal, HTML Hex, JavaScript DOM injector, CSS reverse-bidi, and URL percent encoding
  • Transparent human readability: rendered text appears normal to website visitors while source code frustrates scrapers
  • Copy ready-to-paste HTML code snippets for blogs, footers, and contact pages
  • Live visual comparison of encoded markup vs browser rendering

How to Use Anti-Spam Email Obfuscator & Crawler Cloaker

1

Enter Email

Type the public contact email you want to protect.

2

Choose Protection Method

Compare decimal entities, JavaScript dynamic injection, or CSS reverse-bidi.

3

Embed on Website

Copy the generated code snippet and paste into your website footer or contact page HTML.

Privacy & In-Browser Execution Guarantee

All obfuscation algorithms run 100% locally in your browser memory.

Frequently Asked Questions

How does CSS reverse-bidi obfuscation work?

The email string is reversed in the HTML source code (e.g. "moc.elpmaxe@tcatnoc"), and the CSS style "unicode-bidi: bidi-override; direction: rtl;" tells the browser to visually render the letters in reverse order for human eyes.

Can web scrapers decode HTML entities?

Basic scrapers looking for plaintext "user@domain.com" will completely overlook entity-encoded addresses, dramatically reducing spam intake.

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RFC 5322 Email Validator & Deliverability Auditor
Validate syntax, detect disposable inbox domains, spot role accounts, and catch domain typos 100% in-browser
Bulk Email Extractor & Address Scraper
Harvest, deduplicate, and sort email addresses from raw text, HTML source code, or server logs