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Octal to Hexadecimal
About This Tool
Octal to Hexadecimal is an online hex-octal converter that grants free daily quota, no install, no sign-up, ready to use. Enter hexadecimal or octal numbers and convert both ways with one click, with batch conversion, copy and download supported. All processing runs locally in your browser for 100% privacy, and your numbers are never uploaded to any server. Whether you are coding and debugging, learning or doing daily conversions, it handles the job easily and delivers accurate, reliable results.
How to Use
- Enter numbers
Type hexadecimal (0-9, A-F) or octal (0-7) numbers in the left box, with multiple values separated by spaces or new lines
- Pick a direction
Click "Hex to Octal" or "Octal to Hex" and the tool converts automatically
- View result
The result shows in the right box, where you can click "Copy" or "Download" to save it
Use Cases
- Coding and debugging: quickly switch between hex and octal when reading or writing bit operations, device registers and low-level config code
- Learning: verify the hex-octal relationship while studying computer architecture and assembly language
- Format conversion: batch-convert numbers expressed in hex or octal within config files, all at a glance
Key Advantages
- Free daily quota
We grant free daily usage for everyone, enough for everyday light needs; higher-volume or professional needs can be unlocked with a membership
- Privacy safe
All conversion runs locally in your browser; numbers are never uploaded to any server, so sensitive data carries zero leak risk
- No install, no sign-up
Just open the page to use it, no software to install and no account to register, start converting anytime, anywhere
- Batch conversion
Convert many values at once separated by spaces or new lines, with results output in matching order, doubling your efficiency
- Accurate and reliable
Strictly follows base-conversion rules, auto-detects
0x/0oprefixes and validates input format, giving precise results - Cross-platform
Runs smoothly on desktop, phone and tablet alike, ready in any browser without OS restrictions
Hex and Octal Reference
Hex-to-octal conversion goes through binary: each hex digit maps to 4 binary digits, and every 3 binary digits map to 1 octal digit. The table below shows common value pairs:
| Hex | Octal | Description |
|---|---|---|
| 0 | 0 | Hex 0 maps to octal 0 |
| 1 | 1 | Hex 1 maps to octal 1 |
| 7 | 7 | Hex 7 maps to octal 7 |
| 8 | 10 | Hex 8 maps to octal 10 |
| A | 12 | Hex A maps to octal 12 |
| F | 17 | Hex F maps to octal 17 |
Typical Uses of Octal
Octal is often used in computer systems as a shorthand for binary; every 3 binary digits map to exactly 1 octal digit, greatly shortening the written length and easing reading and writing.
Some embedded systems, device registers and legacy config files still express numbers in octal; mastering hex-octal conversion helps you read such low-level data quickly.
Frequently Asked Questions
It is an online base-conversion tool. It converts both ways between hexadecimal (0-9, A-F) and octal (0-7) numbers, supports batch processing of multiple values at once, and runs entirely in your browser without uploading any data.
Just three steps to convert. First paste or type hex or octal numbers in the left box, then click the matching convert button (e.g. "Hex to Octal"); the result appears in the right box instantly, and you can save it via "Copy" or "Download".
Both hex and octal, with common prefixes. Hex may use the 0x prefix (e.g. 0x1A), octal may use the 0o prefix (e.g. 0o17), and plain numbers without a prefix convert normally too.
Batch conversion is supported. Separate multiple values with spaces or new lines, and the tool converts them one by one in matching order. We provide free daily usage; high-volume or frequent needs can be unlocked with a membership.
Conversion is instant. All calculation runs locally in your browser with no server round-trip, so even large batches return results immediately regardless of network.
Completely safe, data never leaves your device. All processing runs locally in your browser and numbers are never uploaded, so there is no leak risk and you can handle sensitive content with confidence.
Ready to use, no registration. This tool grants free daily usage for everyday light needs at zero cost; if you need higher quota or more frequent use, a membership unlocks more benefits.
Yes, it works on all platforms. The tool adapts to desktops, phones and tablets; just open it in a browser for a smooth experience, no app to install.
Faster, more accurate, more convenient. Manual hex-octal conversion is error-prone and basic calculators struggle with batches; this tool offers one-click batch conversion, auto input validation, plus copy and download, far outperforming manual work.
Check for illegal characters. Hex may contain only 0-9 and A-F (case-insensitive), octal only 0-7, and multiple values must be separated by spaces or new lines. Fix and retry the conversion.
Results are fully accurate, following standard base-conversion rules. Hex is first turned into an intermediate base then into octal, and vice versa, with no loss of precision; after conversion, verify a value or two to confirm the input was correct.
Absolutely. This site also offers binary-octal, decimal-hex and decimal-binary converters, so you can combine them as needed to convert freely between multiple bases.
Content last updated：2026-07-10
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