Encoding & Crypto — Guides & Articles

• HMAC Generator API Alternative: Skip the Endpoint

  Published 2026-09-17

  Skip the HMAC API endpoint. The HMAC Generator computes SHA-256, SHA-384 and SHA-512 tags locally with exact UTF-8 or hex key and message bytes.

  

• Hill Cipher Decoder: Command Line vs Online Compared

  Published 2026-09-17

  Hill cipher decoder compared: command line vs online. See where conventions clash and how the browser tool checks invertible 2x2 keys.

  

• Notepad++ Hex to Text: A Strict UTF-8 Browser Path

  Published 2026-09-17

  Notepad++ treats hex as text rather than bytes. A strict, in-browser UTF-8 tool parses continuous, spaced, and 0xNN hex, then fails on invalid sequences.

  

• Gzcompress Online on Android: A Mobile Browser Guide

  Published 2026-09-17

  Compress UTF-8 text to gzip Base64 or restore gzip Base64 back to text on Android using your mobile browser. No install, no upload, runs in Chrome.

  

• Convert File to Base64 in Java with java.util.Base64

  Published 2026-09-17

  Convert a file to Base64 in Java using java.util.Base64 with byte-exact output, then verify with a 10 MB local browser tool that runs entirely client-side.

  

• Calculate CRC32 of a File: Match the 8-Digit Checksum

  Published 2026-09-16

  Calculate CRC32 of a file with a browser-based CRC-32/ISO-HDLC tool. Match all eight hex digits, handle text vs bytes correctly, and avoid variant mistakes.

  

• BCC Checksum Example: A Step-by-Step XOR-8 Walkthrough

  Published 2026-09-16

  BCC checksum examples worked out byte by byte. See XOR-8 BCC, Modbus ASCII LRC, and byte-sum modulo 256 on real hex inputs you can reproduce locally.

  

• Caesar Cipher Decoder Example: See a Real Shift Solved

  Published 2026-09-16

  Caesar cipher decoder example: see a real shift worked through step by step. Try the inverse direction in our free browser-based Caesar Cipher Decoder.

  

• Base64 Decode on Android: A Code and Mobile Browser Guide

  Published 2026-09-15

  Decode Base64 on Android with android.util.Base64 in code or a UTF-8 browser tool on your phone. Code snippets, mobile steps, and padding tips.

  

• Base58 Decode Free No Sign Up: Run It in Your Browser

  Published 2026-09-15

  Decode Base58 strings free in your browser with no signup. Get exact hex bytes and a UTF-8 interpretation from Bitcoin-alphabet values while your data stays…