Text Encryptor & Decryptor — Secure Any Text Instantly
Encrypt or decrypt text using 6 powerful cipher methods: Base64, Caesar, ROT13, Atbash, Vigenere, and XOR. Adjustable parameters, key strength analysis, and instant results — all processed privately in your browser.
ShiftShifts each letter by this many positions (1-25)
Keyword
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Letters only, case-insensitive
Key
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Any characters allowed
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Base64 — Converts text to a safe ASCII representation. Commonly used for encoding data in emails, URLs, and APIs. Not encryption, but widely used for data transport.
Input
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Output
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Method: Base64
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Output: 0 chars
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Why This Tool
Professional Encryption, Simplified
A comprehensive cipher toolkit built for developers, security enthusiasts, students, and anyone who needs to encode or decode text quickly and privately.
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6 Cipher Methods
Encrypt or decrypt using Base64 encoding, Caesar shift cipher with adjustable shift value, ROT13 fixed substitution, Atbash reverse alphabet, Vigenere keyword cipher, and XOR binary operation. Each method has its own strengths and use cases.
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Key Strength Indicator
Real-time key strength analysis for Vigenere and XOR ciphers. Evaluates length, character variety, and common patterns. Provides instant visual feedback with a color-coded strength bar so you know how secure your key is before encrypting.
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Instant Processing
All encryption and decryption runs instantly in your browser. Optimized JavaScript logic handles large texts efficiently. Performance metrics show processing time so you can verify speed, even for texts with thousands of characters.
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100% Client-Side Privacy
Zero server communication. Your text, keys, and encrypted output never leave your device. No data is transmitted, stored, logged, or shared. Close the tab and everything is permanently erased from memory.
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Smart Input & Output
One-click swap moves output back to input for chained operations. Paste from clipboard, load sample text, copy encrypted output, or download as a text file. All edge cases handled: special characters, Unicode, multi-line text, and empty keys.
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Works Everywhere
Fully responsive design that works flawlessly on desktop, tablet, and mobile devices. The cipher method tabs and stacked editor layout adapt to any screen size. Fast, touch-friendly buttons and controls throughout.
FAQ
Frequently Asked Questions
Base64 is a binary-to-text encoding scheme that represents binary data as an ASCII string. It uses a set of 64 characters (A-Z, a-z, 0-9, +, /) to encode data, making it safe for transmission over text-based protocols like email and HTTP. Every 3 bytes of input become 4 Base64 characters. Note that Base64 is encoding, not encryption — anyone can decode it without a key.
The Caesar Cipher shifts each letter in the text by a fixed number of positions in the alphabet. With a shift of 3, A becomes D, B becomes E, and Z wraps around to C. Numbers, spaces, punctuation, and special characters are left unchanged. You can adjust the shift from 1 to 25. To decrypt, you simply apply the reverse shift. Named after Julius Caesar, who used it for military messages.
Encoding converts data into a new format for compatibility or transport — anyone can decode it (e.g., Base64). Encryption transforms data using a key so only authorized parties can read it (e.g., Caesar, Vigenere, XOR). The key difference is the use of a secret key for encryption, which adds a layer of security. Decoding requires no key; decryption requires the correct key.
Absolutely. All encryption and decryption runs entirely in your browser using JavaScript. Your text is never transmitted to any server, never stored in databases, never shared, and never logged. When you close or refresh the page, your data is permanently erased from memory. This makes the tool suitable for processing sensitive text.
The Vigenere Cipher is a polyalphabetic substitution cipher that uses a keyword to determine the shift for each letter. If the keyword is "KEY", the first plaintext letter shifts by K=10, the second by E=4, the third by Y=24, then it repeats. This makes it significantly harder to crack than Caesar because the shift changes with every letter. It was considered unbreakable for 300 years until Charles Babbage and Friedrich Kasiski found methods to break it.
XOR (exclusive OR) encryption compares each character's binary representation with the corresponding key character using bitwise XOR. If both bits are the same, the result is 0; if different, the result is 1. XOR is symmetric: encrypting text with a key and then encrypting the result with the same key returns the original text. This makes it both an encryptor and decryptor with the same operation. The security depends entirely on key strength.
The Atbash Cipher is one of the oldest known ciphers, originally used with the Hebrew alphabet. It maps each letter to its mirror image in the alphabet: A becomes Z, B becomes Y, C becomes X, and so on. It is self-reciprocal, meaning the same operation encrypts and decrypts. While not secure by modern standards, it is historically significant and commonly used in puzzles and educational contexts.
The key strength indicator evaluates your key or keyword for Vigenere and XOR ciphers. It checks: key length (longer is better), use of mixed character types (uppercase, lowercase, numbers, symbols), and common weak patterns. The result is shown as a color-coded bar: red (weak), yellow (fair), green (good), or gradient (strong). Use this to ensure your key provides adequate security for your needs.