see-non-printable-characters/index.html at main · 0Ky/see-non-printable-characters · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Detect Homoglyphs & Hidden Unicode Characters</title>
<style type="text/css">
    body {
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        background: #1f1f1f;
        margin: 0;
        padding: 20px;
        min-height: 100vh;
        color: #e8e8e8;
    }

    div.main {
        background: #2d2d2d;
        border-radius: 16px;
        border: 1px solid #4d4d4d;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
        padding: 2.4em 3em;
        margin: 0 auto;
        max-width: 1000px;
    }

    div.output {
        margin: 1em 0;
        border: 1px solid #4d4d4d;
        border-radius: 8px;
        padding: 1em;
        font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
        cursor: default;
        background: #232323;
        line-height: 1.6;
    }

    /* Character styling */
    div.output span.symbol,
    div.output span.whitespace-all,
    div.output span.whitespace,
    div.output span.non-typable {
        border-radius: 4px;
        margin: 0 2px;
        padding: 2px 6px;
        transition-property: background, color, padding, opacity;
        transition-duration: 0.25s;
        transition-timing-function: ease-in-out;
    }

    div.output span.symbol {
        color: #2a2a2a;
        background: #8b898b;
    }

    div.output span.whitespace-all {
        color: #2a2a2a;
        background: #bae1ff;
    }

    div.output span.whitespace {
        color: #2a2a2a;
        background: #8b898b;
    }

    div.output span.non-typable {
        color: #2a2a2a;
        background: #e8a966;
        transition-property: background, color, padding, opacity;
        transition-duration: 0.25s;
        transition-timing-function: ease-in-out;
    }

    div.output span.typable {
        border-radius: 4px;
        transition-property: background, color, padding;
        transition-duration: 0.25s;
        transition-timing-function: ease-in-out;
        white-space: pre;
        padding-top: 2px;
        padding-bottom: 2px;
        color: #e8e8e8;
    }

    div.output span.symbol:hover,
    div.output span.whitespace-all:hover,
    div.output span.whitespace:hover,
    div.output span.non-typable:hover,
    div.output span.typable:hover {
        background: #ff8f8f;
        color: #2a2a2a;
    }

    /* Tooltip styling */
    .tooltip {
        position: relative;
        display: inline-block;
    }

    .tooltip .tooltiptext {
        opacity: 0;
        position: absolute;
        left: 50%;
        transform: translateX(-50%) translateY(10px);
        padding: 3px 9px;
        color: #e8e8e8;
        background: rgba(124, 74, 74, 0.61);
        backdrop-filter: blur(10px);
        border: 1px solid #e7b5b5;
        border-radius: 8px;
        font-weight: 500;
        text-align: left;
        z-index: 1000;
        white-space: pre;
        font-size: 14px;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
        transition: all 0.25s cubic-bezier(.65,.05,.36,1);
        pointer-events: none;
        height: max-content;
        bottom: 30px;
        line-height: 1;
    }

    div.output span.symbol:hover ~ .tooltiptext,
    div.output span.whitespace-all:hover ~ .tooltiptext,
    div.output span.whitespace:hover ~ .tooltiptext,
    div.output span.non-typable:hover ~ .tooltiptext,
    div.output span.typable:hover ~ .tooltiptext {
        opacity: 1;
        bottom: 40px;
    }

    /* Form styling */
    textarea {
        border: 1px solid #4d4d4d;
        border-radius: 8px;
        padding: 12px;
        background: #252525;
        font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
        resize: vertical;
        color: #e8e8e8;
        width: 100%;
        box-sizing: border-box;
    }

    textarea:focus {
        outline: none;
        box-shadow: 0 0 5px #5447ca;
        border-color: #a5b5d4;
    }

    textarea::placeholder {
        color: #a0a0a0;
    }

    /* Controls styling */
    .controls {
        display: flex;
        gap: 15px;
        align-items: center;
        margin: 1em 0;
        padding: 12px;
        background: #373737;
        border-radius: 8px;
        border: 1px solid #4d4d4d;
        flex-wrap: wrap;
    }

    .checkbox-container {
        display: flex;
        align-items: center;
        gap: 8px;
        flex: 1;
    }

    .checkbox-container input[type="checkbox"] {
        width: 16px;
        height: 16px;
        accent-color: #818cf8;
        flex: 0;

    }

    .checkbox-container label {
        color: #e0e0e0;
        font-size: 14px;
        cursor: pointer;
    }

    .copy-button {
        background: #5447ca;
        color: #e8e8e8;
        border: none;
        padding: 8px 16px;
        border-radius: 6px;
        cursor: pointer;
        font-size: 14px;
        font-weight: 500;
        transition: background 0.2s ease;
        flex-shrink: 1;
    }

    .copy-button:hover {
        background: #6366f1;
    }

    .copy-button:active {
        background: #4338ca;
    }

    .copy-button.success {
        background: #2c864f;
    }

    /* Stats styling */
    #stats {
        color: #b5b5b5;
        font-size: 14px;
        font-weight: 500;
        padding: 8px 12px;
        background: #373737;
        border-radius: 8px;
        border: 1px solid #4d4d4d;
        margin: 1em 0;
    }

    /* Headings */
    h1 {
        color: #f5f5f5;
        font-weight: 600;
        margin-bottom: 0.5em;
    }

    h2 {
        color: #e0e0e0;
        font-weight: 600;
        margin-top: 2em;
    }

    /* Links */
    a {
        color: #818cf8;
        text-decoration: none;
    }

    a:hover {
        color: #a5b4fc;
        text-decoration: underline;
    }

    /* List styling */
    ul {
        padding-left: 1.5em;
    }

    li {
        margin-bottom: 0.5em;
        color: #e0e0e0;
    }

    p {
        color: #e0e0e0;
        line-height: 1.6;
    }

    /* Grayed out styling for removed characters */
    .removed {
        opacity: 0.3;
        text-decoration: line-through dotted;
    }
</style>
</head>
<body>

<div class="main">
    <h1>Detect Homoglyphs & Hidden Unicode Characters</h1>
    <p>Online tool to display <a href="https://maxhalford.github.io/blog/homoglyphs/" target="_blank">homoglyph</a> and non-printable characters that may be hidden in copy &amp; pasted strings.</p>

    <div>
        <textarea id="inputText" rows="8" cols="40" dir="auto" placeholder="Paste your text here...">Letter Α and A aren&#39;t the same.
These whitespace characters differ in Unicode.
The word bee contains 4 characters.
The emoji 🕵🏻‍♂️ is a multibyte character composed of 14 UTF-8 bytes and represents 5 distinct Unicode codepoints.</textarea>
    </div>

    <div class="controls">
        <button id="copyButton" class="copy-button">Copy (Sanitized)</button>
        <div class="checkbox-container">
            <input type="checkbox" id="removeSpacesOnly" />
            <label for="removeSpacesOnly">Remove only non-standard whitespace</label>
        </div>
    </div>

    <div id="output"></div>
    <div id="stats"></div>

    <h2>Helpful Sites for Details on UTF Characters</h2>
    <ul>
        <li><a href="https://www.mclean.net.nz/ucf/" target="_blank">&lt;mclean.net.nz&gt; Unicode Character Finder</a></li>
        <li><a href="https://r12a.github.io/app-conversion/" target="_blank">&lt;r12a.github.io&gt; Unicode Converter</a></li>
        <li><a href="https://poppycocker.github.io/UnicodeFinder/" target="_blank">&lt;poppycocker.github.io&gt; Unicode Character Finder</a></li>
        <li><a href="https://www.branah.com/unicode-converter" target="_blank">&lt;branah.com&gt; Unicode Converter</a></li>
        <li><a href="http://www.fileformat.info/info/unicode/char/search.htm" target="_blank">&lt;fileformat.Info&gt; Unicode Character Search</a></li>
        <li><a href="http://utf8-chartable.de/unicode-utf8-table.pl" target="_blank">&lt;utf8-chartable.de&gt; UTF-8 Encoding Table & Unicode Characters</a></li>
    </ul>

    <h2>Privacy Notice</h2>
    <p>Your privacy is fully protected on this site. All text is processed locally in your browser and never leaves your device. No personal information is collected, no data is stored and no cookies or tracking tools are used.</p>

    <h2>Source Code</h2>

    <p>This site is a fork of the original tool from <a href="https://github.com/BurninLeo/see-non-printable-characters">soscisurvey.de</a>. The source code is available on <a href="https://github.com/0Ky/see-non-printable-characters">GitHub</a>.</p>

</div>

<script>
    document.addEventListener('DOMContentLoaded', () => {
        const textarea = document.getElementById('inputText');
        const output = document.getElementById('output');
        const stats = document.getElementById('stats');
        const copyButton = document.getElementById('copyButton');
        const removeSpacesOnlyCheckbox = document.getElementById('removeSpacesOnly');

        function getCharCode(char) {
            return char.codePointAt(0);
        }

        function getByteLength(str) {
            return new TextEncoder().encode(str).length;
        }

        function isTypableOnUSKeyboard(char) {
            // includes tab, newline & carriage return
            const US_KEYBOARD_TYPABLE = /^[\x09\x0A\x0D\x20-\x7E]$/;
            return US_KEYBOARD_TYPABLE.test(char);
        }

        function isSpaceChar(char) {
            // Check if it's a Unicode space character (excluding normal space U+0020)
            return /^(?!\u0020)[\p{Z}\p{Cf}]$/u.test(char);
        }

        function createTooltip(char, symbol) {
            const code = getCharCode(char);
            const utf8Bytes = new TextEncoder().encode(char);
            const utf8Hex = Array.from(utf8Bytes).map(b => b.toString(16).padStart(2, '0').toUpperCase()).join(' ');
            const codepoint = `U+${code.toString(16).padStart(4, '0').toUpperCase()}`;

            const desc = `${'UTF-8'.padStart(9)}: ${utf8Hex}\n${'Decimal'.padStart(9)}: ${code}\n${'Codepoint'}: ${codepoint}`;
            return `<span class="tooltip">${symbol}<span class="tooltiptext">${desc}</span></span>`;
        }

        function processChar(char) {
            const code = getCharCode(char);
            const hex = `U+${code.toString(16).toUpperCase().padStart(4, '0')}`;

            if (char === '\r') {
                return createTooltip(char, '<span class="symbol">CR</span>');
            } else if (char === '\n') {
                return createTooltip(char, '<span class="symbol">LF</span>');
            } else if (char === '\t') {
                return createTooltip(char, '<span class="symbol">⟶</span>');
            } else if (char === '\u0020') {
                return createTooltip(char, '<span class="whitespace">·</span>');
            } else if (isSpaceChar(char)) {
                return createTooltip(char, `<span class="whitespace-all removed">${hex}</span>`);
            } else if (!isTypableOnUSKeyboard(char)) {
                const nonTypableClass = removeSpacesOnlyCheckbox.checked ? "non-typable" : "non-typable removed";
                return createTooltip(char, `<span class="${nonTypableClass}">${hex}</span>`);
            } else {
                return createTooltip(char, `<span class="typable">${char}</span>`);
            }
        }

        function convertTextToHtml(text) {
            let html = '<div class="output" dir="auto">';
            for (let i = 0; i < text.length; i++) {
                const char = text[i];
                if (char === '\n') {
                    html += processChar(char) + '</br>';
                } else {
                    html += processChar(char);
                }
            }
            return html + '</div>';
        }

        function updateStats() {
            const text = textarea.value;
            const removeSpacesOnly = removeSpacesOnlyCheckbox.checked;
            const charCount = text.length;
            const byteCount = getByteLength(text);

            const removedCount = document.querySelectorAll("#output span.removed").length

            stats.textContent = `${charCount} characters, ${byteCount} bytes${removedCount > 0 ? ` (${removedCount} characters removed)` : ''}`;
        }

        function toggleRemoveSpaces() {
            const removeSpacesOnly = removeSpacesOnlyCheckbox.checked;
            const nonTypableChars = document.querySelectorAll("#output span.non-typable");
            if (removeSpacesOnly) {
                nonTypableChars.forEach(el => el.classList.remove("removed"));
            } else {
                nonTypableChars.forEach(el => el.classList.add("removed"));
            }
            updateStats();
        }

        function updateDisplay() {
            const text = textarea.value;
            const html = convertTextToHtml(text);
            output.innerHTML = html;
            updateStats();
        }

        async function copyToClipboard() {
            const text = textarea.value;
            const removeSpacesOnly = removeSpacesOnlyCheckbox.checked;

            let cleanedText = '';
            for (let i = 0; i < text.length; i++) {
                const char = text[i];

                // Always remove space characters (Unicode spaces except normal space)
                if (isSpaceChar(char)) {
                    continue;
                }

                // Also remove non-typable characters if checkbox unchecked
                if (!removeSpacesOnly && !isTypableOnUSKeyboard(char)) {
                    continue;
                }

                cleanedText += char;
            }

            await navigator.clipboard.writeText(cleanedText);
            copyButton.textContent = 'Copied!';
            copyButton.classList.add('success');
            setTimeout(() => {
                copyButton.textContent = 'Copy (Sanitized)';
                copyButton.classList.remove('success');
            }, 2000);
        }

        textarea.addEventListener('input', updateDisplay);
        copyButton.addEventListener('click', copyToClipboard);
        removeSpacesOnlyCheckbox.addEventListener('change',toggleRemoveSpaces);

        updateDisplay();
    });
</script>
</body>
</html>