Octal to Binary

About This Tool

Octal to Binary is a free daily-quota online binary to octal converter that requires no installation and no registration — ready to use in seconds. Enter binary or octal numbers and convert them in both directions with a single click, with support for batch conversion, copy and download. All processing is done locally in your browser for 100% privacy — your numbers are never uploaded to any server. Whether you are debugging code, learning computer science or doing everyday conversions, this tool delivers accurate, professional-grade results effortlessly.

How to Use

1. Enter numbers

   Type binary (0 and 1) or octal (0-7) numbers in the left input box. Separate multiple numbers with spaces, commas or new lines

2. Pick direction

   Click the "Binary → Octal" or "Octal → Binary" button and the conversion happens automatically

3. View result

   The result appears in the right text box. Use the "Copy" or "Download" button to save it

Use Cases

• Code debugging: quickly switch between binary and octal when reading or writing bitwise operations, device registers and communication protocol code
• Tech learning: verify the conversion relationship between binary and octal while studying computer organization or assembly language
• Format conversion: batch-convert numbers written in binary or octal notation in configuration files at a glance

Key Advantages

1. Free Daily Quota

   Every day you get free usage, which is enough for light everyday needs at zero cost. Frequent or professional users can unlock higher quotas with a membership

2. Privacy Safe

   All conversions run locally in your browser — numbers are never uploaded to any server, so sensitive data stays completely private

3. No Install, No Sign-up

   Open the page and start converting right away — no software to download and no account to register

4. Batch Conversion

   Convert multiple numbers at once by separating them with spaces, commas or new lines, with results output one-to-one in order

5. Accurate and Reliable

   Strictly follows standard base-conversion rules, auto-detects 0b/0o prefixes and validates input for error-free results

6. Works on All Devices

   Runs smoothly on desktop, mobile and tablet — just open your browser, regardless of operating system

Quick Conversion Rules

Binary and octal conversion is very intuitive: reading from right to left, every 3 binary digits correspond to exactly 1 octal digit. Master the table below to convert in your head:

Binary	Octal	Conversion Rule
000	0	Binary 000 equals octal 0
001	1	Binary 001 equals octal 1
010	2	Binary 010 equals octal 2
011	3	Binary 011 equals octal 3
100	4	Binary 100 equals octal 4
101	5	Binary 101 equals octal 5
110	6	Binary 110 equals octal 6
111	7	Binary 111 equals octal 7

Typical Uses of Octal

In computer systems, octal is often used as a compact "shorthand" for binary: every 3 binary digits map to 1 octal digit, greatly shortening how numbers are written and making them easier to read and type.

Some embedded systems, device registers and legacy configuration files still represent values in octal. Knowing how to convert between binary and octal helps you quickly make sense of such low-level data.

FAQ