Rotate Bits in Binary Numbers
Quickly rotate bits in binary numbers to the left or right. 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 Rotate Bits in Binary Numbers
- 1. Paste one or more binary values. Enter the numbers to rotate, each on its own line. Every value is rotated within its own length, so a batch of masks or captured words processes in one go.
- 2. Pick the Direction. The Direction option selects Left or Right. Left moves high bits around to the bottom, right does the reverse; choose whichever matches the ROL or ROR operation you are modeling.
- 3. Set the Amount. Amount is the number of positions each value rotates. Amounts larger than the bit length simply wrap around again, so rotating a 4-bit value by 5 equals rotating it by 1.
- 4. Copy the rotated batch. Copy all the rotated values from the output pane, still in their original line order. Flip the Direction to undo a rotation and recover the inputs exactly.
When to use Rotate Bits in Binary Numbers
Rotate Bits in Binary Numbers is the general-purpose circular shifter: either direction, any amount, applied across a whole list of values at once. When you are comparing ROL and ROR effects, or need the same rotation applied to twenty test words, this single tool covers what the one-direction variants do individually.
- Batch-rotating cipher test vectors. A crypto kata requires every test word rotated left by 7 before the next round. Paste all the vectors, set Direction and Amount once and collect the whole set.
- Comparing directions on the same data. Unsure whether a spec means rotate left or right? Run the sample value both ways and check which output matches the expected result printed in the document.
- Building rotation lookup tables. Some bit-twiddling code precomputes every rotation of a constant. Enter the constant once per line and step the Amount to generate each table row in sequence.
- Normalizing circular bit signatures. Rotation-invariant matching, as used for circular barcodes or necklace enumeration, compares all rotations of a pattern. Generate the candidates here and select the lexicographically smallest form.
Examples
Rotate left by 1
Input
1000
Output
0001
Rotate right by 1
Input
0001
Output
1000
About the Rotate Bits in Binary Numbers tool
Rotate Bits in Binary Numbers runs as plain JavaScript in your browser tab, with no server behind it. Quickly rotate bits in binary numbers to the left or right. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's Binary Tools section, 112 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with 2 settings, including Direction and Amount, and the result refreshes the moment you change one. 2 worked examples further down the page show exactly what the tool produces for real inputs.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does Rotate Bits in Binary Numbers cost anything?
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?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
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?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
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.