ASCII / Unicode Explorer
Inspect characters, code points, bytes, and escapes
Related
Landing-page workflow
CS Fundamentals
Make low-level concepts visible: number bases, bits, logic, character encodings, and simple classical ciphers.
Use this when a developer task turns into a fundamentals problem and seeing the representation helps.
Primary Tools
Binary / Hex / Decimal Converter
Convert exact integers between base 2, 10, and 16
Bitwise Operations Calculator
Evaluate AND, OR, XOR, NOT, and bit shifts by width
Morse Code Translator
Translate text to and from Morse code
ROT13 / Caesar Cipher
Encode with ROT13 or Caesar cipher
Truth Table Generator
Generate propositional logic truth tables in the browser
Two's Complement Calculator
Convert signed decimals to fixed-width binary and back
Workflow Lessons
beginner 8 min
Convert a Feature Flag Between Binary, Hex, and Decimal
Translate one flag value across number bases and catch where a copied constant changed meaning.
beginner 8 min
Find the Character That Broke a Copy-Paste Flow
Inspect invisible characters before blaming validation, rendering, or a teammate's paste.
intermediate 12 min
Debug a Bitmask Permission Check
Use fixed-width bitwise operations to explain why one permission bit is missing.
intermediate 12 min
Decode a Negative Integer from Fixed-Width Binary
Decode a two's-complement bit pattern before turning a device value into a fake positive number.
intermediate 12 min
Prove a Conditional Before Shipping It
Generate a truth table to catch a conditional that is correct in prose but wrong in code.
beginner 8 min
Decode a Morse Message and Check the Spacing
Translate Morse code and verify whether spacing changed letters, words, or the whole message.
beginner 8 min
Recognize and Decode ROT13 Text
Identify a simple substitution cipher and decode it without mistaking it for encryption.