Online Text Encryption and Decryption Tool

Need to clean up, change or check your text? Use this free Online Text Encryption and Decryption Tool in your browser. It works on phone, tablet and computer.

How to use the Online Text Encryption and Decryption Tool

Fill in the fields, such as “Enter Text”, “Shift Value (for Caesar Cipher)”, “Select Cipher Type”.
Click “Encrypt”.
Your result shows on the page.

Why use this Online Text Encryption and Decryption Tool?

The Online Text Encryption and Decryption Tool is handy for writing, editing, coding, social media and study. It is free, easy to use and works on any device.

Handy for students, writers, developers and marketers
Copy the result and use it anywhere
Save time on editing and formatting

Online Text Encryption and Decryption Tool – frequently asked questions

Is the Online Text Encryption and Decryption Tool free to use?

Yes, it is free. You can use the Online Text Encryption and Decryption Tool as often as you like without signing up.

Do I need to install anything?

No. It runs in your web browser on a phone, tablet or computer.

Is my data safe when I use the Online Text Encryption and Decryption Tool?

The tool runs in your browser, so what you enter is processed on your own device and is not sent to our servers.

Who can use the Online Text Encryption and Decryption Tool?

Anyone who works with text: students, writers, developers, teachers, marketers and more.

More free Text Tools

Browse all Text Tools on Ilmhunt, or see all free online tools.

Embed this tool on your website — free

Copy the code below to add this working tool to your own page. A small credit link stays with it — that’s all we ask.

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&lt;html lang=&quot;en&quot;&gt;
&lt;head&gt;
    &lt;meta charset=&quot;UTF-8&quot;&gt;
    &lt;meta name=&quot;viewport&quot; content=&quot;width=device-width, initial-scale=1.0&quot;&gt;
    &lt;title&gt;Text Encryption and Decryption&lt;/title&gt;
    &lt;style&gt;
        body {
            font-family: Arial, sans-serif;
            background: linear-gradient(135deg, #f4f4f9, #add8e6);
            margin: 0;
            padding: 20px;
            color: #333;
        }
        h1 {
            text-align: center;
            color: #4caf50;
            text-shadow: 2px 2px #d3d3d3;
        }
        .container {
            max-width: 800px;
            margin: auto;
            background: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        }
        .input-section {
            margin-bottom: 20px;
        }
        .input-section label {
            display: block;
            margin-bottom: 10px;
            font-weight: bold;
        }
        .input-section input, .input-section select {
            width: 100%;
            padding: 10px;
            margin-bottom: 10px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 14px;
            box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
        }
        .buttons {
            text-align: center;
        }
        .buttons button {
            background: linear-gradient(90deg, #4caf50, #45a049);
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            font-size: 16px;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .buttons button:hover {
            transform: scale(1.1);
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
        }
        .results {
            margin-top: 20px;
        }
        textarea {
            width: 100%;
            height: 150px;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-family: monospace;
            font-size: 14px;
            background: #f9f9f9;
            box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
        }
        .advanced-section {
            margin-top: 30px;
            padding: 20px;
            background: #f8f9fa;
            border: 1px solid #ccc;
            border-radius: 8px;
        }
        .advanced-section h3 {
            color: #333;
            margin-bottom: 15px;
        }
        .checkbox-group label {
            display: block;
            margin-bottom: 5px;
        }
    &lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;h1&gt;Text Encryption and Decryption&lt;/h1&gt;
    &lt;div class=&quot;container&quot;&gt;
        &lt;div class=&quot;input-section&quot;&gt;
            &lt;label for=&quot;textInput&quot;&gt;Enter Text:&lt;/label&gt;
            &lt;textarea id=&quot;textInput&quot; placeholder=&quot;Type your text here...&quot;&gt;&lt;/textarea&gt;
        &lt;/div&gt;

        &lt;div class=&quot;input-section&quot;&gt;
            &lt;label for=&quot;shiftValue&quot;&gt;Shift Value (for Caesar Cipher):&lt;/label&gt;
            &lt;input type=&quot;number&quot; id=&quot;shiftValue&quot; placeholder=&quot;e.g., 3&quot;&gt;
        &lt;/div&gt;

        &lt;div class=&quot;input-section&quot;&gt;
            &lt;label for=&quot;cipherType&quot;&gt;Select Cipher Type:&lt;/label&gt;
            &lt;select id=&quot;cipherType&quot;&gt;
                &lt;option value=&quot;caesar&quot;&gt;Caesar Cipher&lt;/option&gt;
                &lt;option value=&quot;rot13&quot;&gt;ROT13&lt;/option&gt;
                &lt;option value=&quot;base64&quot;&gt;Base64 Encoding&lt;/option&gt;
                &lt;option value=&quot;reverse&quot;&gt;Reverse Text&lt;/option&gt;
            &lt;/select&gt;
        &lt;/div&gt;

        &lt;div class=&quot;buttons&quot;&gt;
            &lt;button id=&quot;encryptButton&quot;&gt;Encrypt&lt;/button&gt;
            &lt;button id=&quot;decryptButton&quot;&gt;Decrypt&lt;/button&gt;
        &lt;/div&gt;

        &lt;div class=&quot;results&quot;&gt;
            &lt;h3&gt;Output&lt;/h3&gt;
            &lt;textarea id=&quot;outputText&quot; readonly&gt;&lt;/textarea&gt;
        &lt;/div&gt;

        &lt;div class=&quot;advanced-section&quot;&gt;
            &lt;h3&gt;Advanced Options&lt;/h3&gt;
            &lt;div class=&quot;checkbox-group&quot;&gt;
                &lt;label&gt;
                    &lt;input type=&quot;checkbox&quot; id=&quot;preserveCase&quot;&gt; Preserve Original Case
                &lt;/label&gt;
                &lt;label&gt;
                    &lt;input type=&quot;checkbox&quot; id=&quot;ignoreSpecial&quot;&gt; Ignore Special Characters
                &lt;/label&gt;
            &lt;/div&gt;
        &lt;/div&gt;
    &lt;/div&gt;

    &lt;script&gt;
        document.getElementById('encryptButton').addEventListener('click', () =&gt; {
            const text = document.getElementById('textInput').value;
            const shift = parseInt(document.getElementById('shiftValue').value, 10) || 0;
            const cipherType = document.getElementById('cipherType').value;
            const preserveCase = document.getElementById('preserveCase').checked;
            const ignoreSpecial = document.getElementById('ignoreSpecial').checked;

            if (!text) {
                alert('Please enter some text to encrypt.');
                return;
            }

            let result;
            if (cipherType === 'caesar') {
                result = caesarCipher(text, shift, preserveCase, ignoreSpecial);
            } else if (cipherType === 'rot13') {
                result = caesarCipher(text, 13, preserveCase, ignoreSpecial);
            } else if (cipherType === 'base64') {
                result = btoa(text);
            } else if (cipherType === 'reverse') {
                result = text.split('').reverse().join('');
            }

            document.getElementById('outputText').value = result;
        });

        document.getElementById('decryptButton').addEventListener('click', () =&gt; {
            const text = document.getElementById('textInput').value;
            const shift = parseInt(document.getElementById('shiftValue').value, 10) || 0;
            const cipherType = document.getElementById('cipherType').value;
            const preserveCase = document.getElementById('preserveCase').checked;
            const ignoreSpecial = document.getElementById('ignoreSpecial').checked;

            if (!text) {
                alert('Please enter some text to decrypt.');
                return;
            }

            let result;
            if (cipherType === 'caesar') {
                result = caesarCipher(text, -shift, preserveCase, ignoreSpecial);
            } else if (cipherType === 'rot13') {
                result = caesarCipher(text, -13, preserveCase, ignoreSpecial);
            } else if (cipherType === 'base64') {
                try {
                    result = atob(text);
                } catch (e) {
                    result = 'Invalid Base64 string.';
                }
            } else if (cipherType === 'reverse') {
                result = text.split('').reverse().join('');
            }

            document.getElementById('outputText').value = result;
        });

        function caesarCipher(text, shift, preserveCase, ignoreSpecial) {
            return text.split('').map(char =&gt; {
                if (/[a-z]/i.test(char)) {
                    const isUpperCase = char === char.toUpperCase();
                    const base = isUpperCase ? 'A'.charCodeAt(0) : 'a'.charCodeAt(0);
                    const offset = ((char.charCodeAt(0) - base + shift) % 26 + 26) % 26;
                    const newChar = String.fromCharCode(base + offset);
                    return preserveCase ? newChar : newChar.toLowerCase();
                } else if (ignoreSpecial &amp;&amp; /[^a-zA-Z]/.test(char)) {
                    return '';
                } else {
                    return char;
                }
            }).join('');
        }
    &lt;/script&gt;
&lt;style&gt;html,body{height:auto!important;min-height:0!important;max-height:none!important}&lt;/style&gt;&lt;script&gt;(function(){function wpcPost(){try{parent.postMessage({wpcId:168,wpcH:document.body.scrollHeight},'*');}catch(e){}}window.addEventListener('load',wpcPost);try{new MutationObserver(wpcPost).observe(document.body,{childList:true,subtree:true,attributes:true});}catch(e){}window.addEventListener('resize',wpcPost);setInterval(wpcPost,600);})();&lt;/script&gt;&lt;/body&gt;
&lt;/html&gt;
" id="wpc-frame-168" class="wpc-embed-frame" style="width:100%;border:0;display:block;overflow:hidden;" scrolling="no"></iframe>
<p><a href="https://ilmhunt.com/online-text-encryption-and-decryption-tool/" target="_blank" rel="noopener">Online Text Encryption and Decryption Tool</a> by <a href="https://ilmhunt.com/" target="_blank" rel="noopener">IlmHunt</a> — free online tools</p>