🚀 Quick Start

Character → ASCII: enter text, click "Encode" to get ASCII codes; click "Decode" to restore characters
ASCII → Character: enter numeric codes to get corresponding characters
Display: decimal/hex/binary/octal are shown together by default
Batch: convert multiple characters or codes at once
Direction: choose Encode/Decode to set conversion direction

📌 Common Scenarios

Programming: handle encodings and debug string issues
Data analysis: inspect special characters and encodings
Networking: understand and debug control characters in protocols
Education: learn computer fundamentals and encoding principles
Security: help identify invisible characters and check suspicious strings
Format conversion: convert between numbering systems

🎛️ Conversion Parameters & Range

Code input: enter ASCII values in various formats
Binary: with 0b prefix, e.g., 0b1000001
Octal: with 0o prefix, e.g., 0o101 0o141
Decimal: e.g., 65 97 32
Hexadecimal: with 0x prefix, e.g., 0x41 0x61 0x20
Separators: spaces, commas, or semicolons
Character ranges: digits 48–57, uppercase 65–90, lowercase 97–122
Common codes: Space (32), 0 (48), A (65), a (97), LF (10), CR (13)
Binary display: show ASCII codes as 8-bit bytes (covering 0–127); characters beyond ASCII are shown by Unicode code points (U+XXXX)
Octal display: 0o-prefixed octal, common in Unix permissions
Decimal display: standard 0–127 values
Hex display: 0x-prefixed (case-insensitive), suitable for programming & debugging
Character preview: shows glyphs; control characters show names
Special characters: supports control chars such as newline (\n) and tab (\t)
Beyond ASCII: characters outside ASCII show their Unicode info; some may appear as surrogate characters (U+D800–U+DFFF)

🧭 Usage Advice

Text input: type or paste the text to convert
Input validation: ASCII codes should be within 0–127
Control characters: handle non-printables carefully
Debugging tip: detect hidden control characters in program output

⚠️ Limitations & Compatibility

Range limit: standard ASCII supports 0–127 only
Beyond range: characters outside ASCII (0–127) will show Unicode info instead of ASCII values
Display limit: some control characters cannot be rendered directly
Compatibility: extended ASCII (128–255) may vary by system

🔒 Privacy & Security

All processing happens in your browser; data never leaves your device

❓ FAQ

Why do some characters not return ASCII codes?

ASCII covers only the basic Latin range 0–127. Characters beyond this (e.g., accented letters, CJK, Arabic, emojis) belong to Unicode; the tool shows their Unicode code points instead. UTF‑8 is fully compatible with ASCII for the first 128 characters

What are control characters and how are they displayed?

Control characters (0–31) are non‑printable (e.g., newline, carriage return, tab). Their names are shown instead of glyphs

What's the rule for letter case in ASCII?

Uppercase A–Z are 65–90; lowercase a–z are 97–122. The difference is 32

Why use hexadecimal?

Hexadecimal is compact and maps simply to binary (1 hex digit = 4 bits)

What is extended ASCII?

Extended ASCII uses 8 bits (128–255) and varies across locales. UTF‑8 is recommended today

Are newline codes different across systems?

Yes. Windows uses CR+LF (13+10); Unix/Linux/macOS use LF (10); classic Mac used CR (13)