Encoding & Crypto— Guides & Articles

• How to Change UTF-8 in Notepad When the File Looks Broken

  Published 2026-08-23

  When Notepad displays garbled text, re-saving as UTF-8 rarely fixes it. Learn how to identify the real source encoding and convert a file to clean UTF-8.

  

• Decode URL Strings in Java: Code and a Browser Tool

  Published 2026-08-23

  Decode a URL in Java with URLDecoder.decode and an explicit UTF-8 charset. Here is the exact code, common exceptions, and a no-code browser alternative.

  

• Char Code Lookup Cheat Sheet: U+XXXX and \u{} Syntax

  Published 2026-08-23

  Char code lookup cheat sheet: U+XXXX and \u{} syntax, supplementary plane rules, surrogate exclusions, plus a local browser encoder/decoder for verification.

  

• Text to Hex ASCII: Convert Strings to Hexadecimal Bytes

  Published 2026-08-23

  Convert text to hex ASCII with exact byte mapping. See ASCII and Unicode byte rules, three output formats, and step-by-step conversion steps.

  

• How to Get the SHA-512 Hash of a File

  Published 2026-08-22

  Get the full SHA-512 hash of any file locally in your browser. Learn the exact steps, output formats, byte rules, and how to verify the digest against a…

  

• Calculate the SHA-1 Hash of a File and Match a Checksum

  Published 2026-08-22

  Calculate the SHA-1 hash of a file locally in your browser, copy the matching Hex or Base64 digest, and verify it against a trusted published checksum.

  

• Generate an RSA Key Pair in Linux Without OpenSSL

  Published 2026-08-22

  Need an RSA key pair in Linux? A browser tool creates RSA-OAEP at 2048 or 3072 bits with SHA-256 and exports SPKI and PKCS#8 PEM locally. No openssl.

  

• Pick the Right Approach to Use a ROT47 Encoder Decoder

  Published 2026-08-22

  Learn when ROT47 is the right fit and how to run the ROT47 Encoder Decoder in your browser, with one reversible step that handles encoding and decoding.

  

• ROT13 Decoder API Alternative: Run It Locally in Browser

  Published 2026-08-22

  Skip remote API calls for ROT13. Apply the rotate-by-thirteen transform in-browser — no key, no upload, no rate limit. Just paste, transform, copy.

  

• 4 Rail Fence Cipher Decoder: Walk Through the Zigzag

  Published 2026-08-22

  Decode a 4 rail fence cipher with the zigzag pattern 0,1,2,3,2,1 (cycle 6). See the row-by-rail reconstruction and run it locally in your browser.