How it works
How to use the Octal to Binary Converter
Paste or open your octal numbers
Type, paste or drop a file into the left editor — or press Sample to try it.
Adjust the options
Use the options in the toolbar; the result updates as you type.
Copy or download the result
Copy or download the output — or press Swap to convert in the other direction.
About the Octal to Binary Converter
Convert one or many octal (base 8) numbers to binary (base 2). Put each number on its own line or separate them with spaces or commas; prefixes such as 0x, 0b and 0o are accepted, and arbitrarily large values are converted exactly.
Built for developers
Why developers use it
Private by design
Runs 100% in your browser. Nothing you paste is uploaded, logged or stored on a server.
Instant results
Output updates as you type, with precise error locations when something is wrong.
Works offline
Once loaded, the tool keeps working without a connection. Install it as an app if you like.
Free, no sign-up
No accounts, no limits, no watermarks.
FAQ
Frequently asked questions
How large can the numbers be?
Base conversions use BigInt arithmetic, so there is no 53-bit limit — you can convert 64-bit, 128-bit or even longer integers exactly.
Is my data uploaded anywhere?
No. Everything runs locally in your browser — nothing you type, paste or open is sent to a server, logged or stored. The tool keeps working offline once the page has loaded.
Keep going
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