Encoding & Crypto — Guides & Articles

• Base64 Decode Bulk Pastes Without Stack Overflow

  Published 2026-08-07

  Paste a large Base64 string and decode it in your browser. The tool handles bulk pastes byte-by-byte, validates UTF-8 strictly, and never uploads a byte to…

  

• Is XOR Encryption Secure? A Repeating-Key Reality Check

  Published 2026-08-06

  Repeating-key XOR is reversible obfuscation, not real encryption. See what the browser tool actually does, where it is unsafe, and which limits apply.

  

• How to Decipher a Vigenere Cipher With a Known Key

  Published 2026-08-06

  Decipher a Vigenere cipher by pasting ciphertext, supplying the repeating A–Z key, and choosing Decrypt. Everything runs in your browser with no upload.

  

• How to Change UTF-8 Encoding in Excel: Step by Step

  Published 2026-08-06

  Excel often misreads UTF-8 files as Windows-1252 and produces garbled characters. Convert the source file to UTF-8 first, then import it through Excel's…

  

• How to Use an HTML Entity Encoder and Decoder

  Published 2026-08-06

  Encode reserved HTML characters and decode named, decimal, or hexadecimal character references back to text in your browser — no upload, no sanitization.

  

• How to Decrypt a 2x2 Hill Cipher Using the mod 26 Inverse

  Published 2026-08-06

  To decrypt a 2x2 Hill cipher, invert the key matrix modulo 26 with A=0 to Z=25. See why coprime determinants and column vectors drive the recovered text.

  

• AES Decrypt Online: Open a JSON Package With Its Password

  Published 2026-08-06

  AES decrypt online: turn a password-protected AES-256-GCM JSON package back into its original text in your browser. Local only, with strict authentication.

  

• Base58 Converter: Encode and Decode the Bitcoin Alphabet

  Published 2026-08-06

  Use a Base58 converter to encode UTF-8 text with the Bitcoin alphabet or decode raw Base58 into exact hex bytes. Preserves leading zeros, runs in browser.

  

• Base32 Converter: Encode UTF-8 Text and Decode RFC 4648

  Published 2026-08-06

  A base32 converter for encoding UTF-8 text to canonical RFC 4648 and decoding A–Z/2–7 values with strict padding, UTF-8 checks, and zero upload.

  

• How to Do Binary to Text Conversion in Your Browser

  Published 2026-08-06

  Convert binary to readable text using UTF-8 in your browser. Step-by-step walkthrough of the Binary To Text tool with Unicode examples and offline privacy.