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Binary to Octal
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Decimal · base 10
Hexadecimal · base 16
Binary · base 2
Octal · base 8
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Enter a binary value above to convert it
// about this tool

Binary to Octal Online

Updated 2026-07-26

Convert binary to octal online for free. Paste a binary value and SnapTools shows its octal representation instantly, right in your browser. Nothing you enter is uploaded.

Grouping bits by 3 instead of 4 is what turns raw binary into octal instead of hex — and it's the grouping Unix permissions rely on, since a value like 111101101 reads as three clean 3-bit permission triplets once it's in octal (755). This converter handles the grouping and padding for you, so you get a compact, correct octal value from any binary string. For every base at once, use the Number Base Converter.

// how to use

  1. 1 Paste or type a binary value into the input — digits 0 and 1 only.
  2. 2 SnapTools converts it to octal as you type.
  3. 3 Copy the octal result, or open the Number Base Converter for all bases at once.

// examples

Permission-style bits
Input
111101101
Output
755
Byte value
Input
11111111
Output
377

// common uses

Turning raw permission bits back into a chmod-style octal value Compacting a long binary string into fewer, denser digits Checking a manual binary-to-octal conversion Learning how binary groups map to octal digits

// faq

Is my input uploaded to a server?
No. The conversion runs entirely in your browser, so nothing you enter leaves your machine.
How do I convert binary to octal by hand?
Group the bits into sets of 3 starting from the right, padding the leftmost group with zeros if needed, then read each 3-bit group as its octal digit (0-7). This tool does the grouping for you.
Why group binary in 3s instead of 4s?
Groups of 4 give you hex; groups of 3 give you octal. Octal grouping is what you want when the result needs to read as a Unix permission value like 755, since each 3-bit group is exactly one permission triplet.
Does my binary value need to be a multiple of 3 bits long?
No — this tool pads the leftmost group automatically, so any length of binary input converts correctly.
What if my input has a character other than 0 or 1?
Binary only uses the digits 0 and 1. Any other character is flagged so you can correct it rather than getting a wrong answer.

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Use this via API

Get a free API key → 
curl -X POST https://thesnaptools.com/api/v1/tools/binary-to-octal \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"number":"111101101"}'
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