Encoding & Crypto— Guides & Articles

• HTML Escape Cheat Sheet: Reserved Characters

  Published 2026-08-25

  Check this HTML escape cheat sheet for five protected characters, basic or non-ASCII encoding, and named or numeric HTML reference decoding locally.

  

• HMAC-SHA256 Tag Generator: Hex and Base64 Guide

  Published 2026-08-25

  Create exact HMAC-SHA256, HMAC-SHA-384, or HMAC-SHA-512 tags from UTF-8 or hexadecimal key and message bytes—no server upload, full RFC 4231 compliance.

  

• Hill Cipher Decoder Alternative: Skip the Matrix Math

  Published 2026-08-25

  Looking for a Hill cipher decoder alternative? Run a browser-based 2x2 mod-26 tool on A-Z text with documented conventions and known-pair checks.

  

• Convert Hex Format to Text: A Strict UTF-8 Workflow

  Published 2026-08-25

  Convert hex format to text with explicit rules for plain bytes, ASCII separators, and 0xNN prefixes, plus fatal UTF-8 decoding for invalid sequences.

  

• Convert File to Base64 for C# Code: Local Browser Steps

  Published 2026-08-25

  Need a Base64 string for C# code? Use the File to Base64 Converter to encode any local file up to 10 MB and drop the canonical output into your project.

  

• Calculate CRC32 Checksum and Match the 8 Hex Digits

  Published 2026-08-25

  Calculate a CRC32 checksum from UTF-8 text or hex bytes using CRC-32/ISO-HDLC and verify the eight-digit hex result, including leading zeros.

  

• BCC Checksum API Alternative: Compute Locally

  Published 2026-08-25

  Replace remote BCC checksum APIs with a browser tool that returns XOR-8, Modbus ASCII LRC, and byte-sum modulo 256 from UTF-8 text or hex bytes.

  

• Caesar Cipher Decoder API Alternative Without Signup

  Published 2026-08-25

  Bypass Caesar cipher decoder APIs with a browser tool that encodes or decodes shifts 0 to 25 locally, requires no API key or signup, and keeps your text in…

  

• Binary to Text Encoding: A UTF-8 Guide

  Published 2026-08-24

  Convert text to 8-bit UTF-8 binary or decode 0s and 1s locally. Handle accents, non-Latin scripts, and emoji with Binary To Text.

  

• Base64 to Hex Cheat Sheet: RFC 4648 Quick Reference

  Published 2026-08-24

  A practical Base64 to hex cheat sheet: canonical RFC 4648 inputs, strict byte boundaries, padding rules, and exact steps for both directions.