NOT ASCII Characters
Bitwise-NOT (invert) every character code, byte-wise. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use NOT ASCII Characters
- 1. Paste the input text. Enter the characters you want to invert. Each one is read as an 8-bit code, so 'A' comes in as 01000001 and the tool works on those raw bits rather than on the letter itself.
- 2. See the ones' complement. Every bit of every byte is inverted: zeros become ones and ones become zeros. 'A' (65) therefore becomes 190, which renders as '¾'. Applying NOT a second time returns the exact original text.
- 3. Copy the inverted output. Take the result from the output pane. Because many inverted codes land in the extended range, expect accented and symbol characters; that is the correct ones' complement, not garbage.
When to use NOT ASCII Characters
NOT ASCII Characters applies a bitwise NOT to every byte of your text, producing the ones' complement. It is the simplest possible reversible byte transform, which makes it handy for learning bitwise logic, recognizing NOT-obfuscated data in the wild, and generating known-answer pairs for code that manipulates bytes.
- Recognizing complemented data in a dump. Malware and toy obfuscators sometimes store strings NOTed to hide them from a plain grep. Run a suspicious byte sequence through this tool and readable text may fall right out.
- Generating known-answer test pairs. You wrote a byte-inversion routine in C or Rust and need expected outputs. Invert a few sample strings here and hard-code the pairs into your unit tests as the reference truth.
- Teaching ones' complement concretely. Truth tables are abstract; watching 'A' turn into '¾' is not. Use live examples in a lesson on complements to connect the operator to actual character codes.
- Sanity-checking an involution property. Any transform claimed to be self-inverse should restore its input after two passes. Round-trip text through NOT twice here to demonstrate the property before relying on it in a protocol.
Examples
Invert bits
Input
A
Output
¾
About the NOT ASCII Characters tool
NOT ASCII Characters is a free online tool that works entirely inside your web browser. Bitwise-NOT (invert) every character code, byte-wise. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 81 ASCII utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
There is nothing to configure. Provide the input and the result appears on its own. A worked example further down the page shows exactly what the tool produces for a real input.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Is NOT ASCII Characters free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.