Client-side ProcessingUpdated 2026-02-11Report issue

Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.

Octal Converter

Convert numbers between octal and decimal, hex, or binary.

FreeRuns in browseroctal converteroctal to decimal

Type a value in any field to convert between number bases.

Octal(base 8)

Decimal(base 10)

Binary(base 2)

Hexadecimal(base 16)

Common Values

Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result

About Octal Converter

Convert numbers between octal and decimal, hex, or binary. Convert octal numbers to decimal, hexadecimal, and binary online for free. Instant base-8 conversion with negative number support. Fast and precise. Converts between all common number bases instantly as you type, with support for standard prefixes like 0x and 0b. Displays all base representations simultaneously for easy reference. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.

How to Use Octal Converter

Enter a number in any supported base.
See the number converted to all other bases instantly.
Copy the representation you need.

Frequently Asked Questions

What is Octal Converter?

Convert octal numbers to decimal, hexadecimal, and binary online for free. Instant base-8 conversion with negative number support. Fast and precise.

What number bases are supported?

The tool supports all commonly used bases including binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). Some tools may support additional bases up to base 36.

Can I convert floating-point numbers?

This tool focuses on integer conversion between bases, which is the most common use case. For floating-point base conversion, you would need to handle the integer and fractional parts separately.

What is the maximum number size?

The tool handles numbers up to JavaScript's safe integer limit (2^53 - 1), which covers the vast majority of practical use cases. For extremely large numbers, BigInt support may be available depending on the specific tool.

Is Octal Converter free to use?

Yes, all base conversions are free and unlimited. No account or signup is needed to use this tool.

Is my data safe when using Octal Converter?

Yes, all conversions happen in your browser. No numbers or data are sent to any server, keeping your input completely private.

Related Tools

Binary Converter

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Hexadecimal Converter

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Any Base Number Converter

Convert numbers between any base from 2 to 36.