Decode a Negative Binary
Quickly convert a negative binary number to a decimal number. 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 Decode a Negative Binary
- 1. Paste the binary value. Type or paste a signed binary number such as 11111011 into the input pane. You can enter several values on separate lines and each one is decoded independently as it arrives.
- 2. Understand how the sign is read. The tool treats the leading bit as the sign under two's complement, the convention nearly every CPU uses. A value starting with 1 decodes to a negative decimal, so 11111011 becomes -5.
- 3. Copy the decimal result. Click the copy button on the output pane and take the signed decimal numbers into your debugger notes, spreadsheet or bug report. Edits to the input re-decode instantly.
When to use Decode a Negative Binary
Decode a Negative Binary is for reading signed values that arrive as raw bits. Registers, memory dumps and wire protocols store negatives in two's complement, and eyeballing 11111011 tells you nothing about its real magnitude. This tool applies the sign interpretation for you and hands back an ordinary decimal you can reason about.
- Reading a debugger memory dump. GDB or a hex viewer shows a byte as 11111110 and you suspect the field is a signed counter. Decoding it as two's complement confirms it holds -2 rather than 254.
- Interpreting sensor or ADC output. A temperature sensor over I2C returns a signed 8-bit reading. Pasting the raw bits here tells you whether the device reported -3 degrees or a large positive value your parser mishandled.
- Checking homework on signed arithmetic. Students working through two's complement exercises can verify each answer immediately. Enter the binary from the worksheet and compare the decoded decimal against the value computed by hand.
- Debugging an overflow bug. A counter in your firmware wrapped and logs now show strange bit patterns. Decoding those patterns as signed integers reveals the moment the value crossed from positive to negative.
Examples
Two's complement
Input
11111011
Output
-5
About the Decode a Negative Binary tool
Decode a Negative Binary does its work locally, right in the browser. Quickly convert a negative binary number to a decimal number. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Binary Tools collection on EditSafely, a set of 112 small, focused Binary utilities that share the same instant, private workspace.
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.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Decode a Negative Binary 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.