What Does This Tool Do?
It converts numeric ASCII codes back into readable text. You can paste values in
decimal (e.g., 72 101 108 108 111), hex
(e.g., 48 65 6C 6C 6F), or binary (e.g.,
01001000 01100101 01101100 01101100 01101111).
Example: 72 101 108 108 111 → Hello
Why Use It?
- Decode ASCII from logs, packets, or CTF challenges
- Reverse engineer systems that output raw ASCII numbers
- Verify that data is valid (with strict error checks)
- Learn the difference between decimal, hex, and binary ASCII
Key Features
- ⚡ Live conversion as you type or paste
- 🤖 Auto-detect input format (or choose manually)
- 🧯 Strict validation with clear errors
- 🔐 Private — everything runs in your browser
- 📋 One-click copy and 💾 download output
- 📱 Responsive UI
How to Use
- Paste ASCII numbers separated by spaces or new lines
- Leave Auto Detect on, or choose Decimal / Hex / Binary
- Keep Printable only checked to block control characters
- For Binary, keep Require 8-bit on (each token must be 8 bits)
- Copy or download the result
FAQ
What counts as “invalid” input?
Anything not matching the selected format (e.g., non-hex letters in Hex, non-8-bit in Binary), or numbers outside the valid byte range (0–255). If Printable only is on, codes outside 32–126 are considered invalid.
Can I include commas or new lines?
Yes. The tool accepts tokens separated by spaces, commas, or new lines.
Does this support Unicode?
This tool targets classic ASCII codes. For Unicode / UTF-8 conversions, use a dedicated UTF-8 tool.