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Decimal to Octal

Convert decimal numbers to octal — enter, convert, and copy instantly.

Input Decimal
Output Octal
Octal output will appear here...
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About Decimal to Octal Converter

Decimal to octal conversion transforms a standard base-10 number into its base-8 representation. The octal system uses only the digits 0 through 7 to represent values, making it a natural grouping of binary digits in sets of three. Octal notation has a long history in computing and is still used today in Unix/Linux file permissions, certain programming languages (with the 0o prefix), and embedded systems where compact binary representation is useful.

This free online converter instantly translates decimal integers — including negative and arbitrarily large numbers — into octal. You can convert multiple values at once by placing each on a separate line. All processing happens entirely in your browser with no data sent to any server, so your input remains completely private. No sign-up, no ads, just fast and accurate decimal-to-octal conversion.

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How to Use

01

Enter Decimal Number

Type or paste your decimal number into the input area. You can enter multiple numbers on separate lines for batch conversion.

02

Convert

Click "Convert" to calculate the octal equivalent of your decimal input. Each line is converted independently.

03

Copy Result

Copy the octal result to your clipboard with one click using the copy button in the toolbar.

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Frequently Asked Questions

What is decimal to octal conversion? expand_more
Decimal to octal conversion translates a base-10 number into a base-8 number. The octal system uses only the digits 0 through 7. For example, the decimal number 255 converts to 377 in octal, and 65535 converts to 177777.
How does decimal to octal conversion work? expand_more
To convert a decimal number to octal, you repeatedly divide the number by 8 and record the remainder at each step. The remainders, read in reverse order, form the octal representation. For example, 255 divided by 8 gives 31 remainder 7, then 31 divided by 8 gives 3 remainder 7, and finally 3 divided by 8 gives 0 remainder 3 — resulting in 377.
Can this tool handle very large decimal numbers? expand_more
Yes. For numbers that exceed the precision of standard JavaScript numbers (roughly 15+ digits), the tool automatically uses BigInt to perform the conversion with full accuracy. There is no practical limit on the size of the decimal input.
Is my data secure? expand_more
Absolutely. All conversion happens entirely in your browser using client-side JavaScript. No data is sent to any server, so your decimal input and octal output remain completely private.