Slice Binary Values
Extract a part of a binary 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 Slice Binary Values
- 1. Paste the binary string. Enter the value you want to cut a piece from, such as a 16-bit word like 1010110011110000. Longer inputs work just as well; only the selected window is returned.
- 2. Set Start and Length. Start marks the position where the slice begins and Length is how many bits to take. Start 1 with Length 8 on the example extracts the first byte, 10101100.
- 3. Copy the extracted piece. Copy the slice from the output pane and use it as its own value. Adjust Start to step the same window across the input, byte by byte or field by field.
When to use Slice Binary Values
Slice Binary Values cuts a contiguous run of bits out of a longer binary string, like substring for base 2. Packed words, protocol headers and register dumps all embed fields at known offsets, and counting to position 23 by eye is where mistakes happen. Specify Start and Length instead and get the exact field.
- Pulling a field from a packed header. An IPv4 header diagram says the TTL occupies a known offset. Slice those eight bits out of the captured binary and decode just the field you are investigating.
- Splitting an instruction encoding. Disassembling by hand means separating opcode, register and immediate fields. Slice each region from the 32-bit instruction word using the offsets in the ISA manual.
- Auditing a bitfield struct layout. A C struct packs several bitfields and you suspect the compiler laid them out unexpectedly. Slice the dumped word at each declared offset and compare against the values you stored.
- Extracting a window for comparison. Two long captures differ somewhere in the middle. Slice the same Start and Length from both and diff the short windows instead of scanning full-length strings.
Examples
Slice
Input
1010110011110000
Output
10101100
About the Slice Binary Values tool
Slice Binary Values runs as plain JavaScript in your browser tab, with no server behind it. Extract a part of a binary number. 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 Start and Length, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
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 Slice Binary Values 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.