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Binary to Decimal
About This Tool
Binary to Decimal is a free daily-quota online decimal to binary converter that requires no installation and no registration — ready to use in seconds. Enter decimal or binary numbers and convert them in both directions with a single click, with support for one-per-line batch conversion, copy and download. All processing is done locally in your browser for 100% privacy — your data is never uploaded to any server. Whether you are calculating IP addresses, learning computer fundamentals or debugging code, this tool delivers accurate, professional-grade results effortlessly.
How to Use
- Enter numbers
Type decimal or binary numbers in the left input box, one per line. Negative numbers and the
0bprefix are supported - Pick direction
Click the "Decimal → Binary" or "Binary → Decimal" button and the conversion happens automatically
- View result
Results are shown line by line in the right text box. Use the "Copy" or "Download" button to save them
Use Cases
- IP address math: quickly switch between decimal and binary when working with subnet masks and network address conversion
- Learning fundamentals: verify conversions while studying data storage, bitwise operations, sign-magnitude and two's complement
- Development debugging: quickly convert memory addresses and data sizes while writing programs to boost productivity
Key Advantages
- 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
- Privacy Safe
All conversions run locally in your browser — data is never uploaded to any server, so sensitive content stays completely private
- No Install, No Sign-up
Open the page and start converting right away — no software to download and no account to register
- Batch Conversion
Convert one value per line in batch; invalid lines are flagged individually without affecting the other results
- Negative Numbers
Both directions support negative input — negative binary results are shown in two's complement form, meeting low-level development needs
- Works on All Devices
Runs smoothly on desktop, mobile and tablet — just open your browser, regardless of operating system
Common Value Reference
Here are the decimal-binary pairs used most often in development, so you can quickly grasp the conversion pattern:
| Decimal | Binary | Note |
|---|---|---|
| 1 | 1 | 2 to the power of 0 |
| 2 | 10 | 2 to the power of 1 |
| 4 | 100 | 2 to the power of 2 |
| 8 | 1000 | 2 to the power of 3 |
| 16 | 10000 | 2 to the power of 4 |
| 32 | 100000 | 2 to the power of 5 |
| 64 | 1000000 | 2 to the power of 6 |
| 128 | 10000000 | 2 to the power of 7 |
| 255 | 11111111 | Maximum value of an 8-bit binary number |
Negative Numbers and Two's Complement
In computers, integers are usually stored in two's complement form. This tool supports negative numbers: binary input may carry a minus sign, and negative decimal values are output as two's complement (32-bit).
Understanding two's complement helps you grasp how integers are stored in a computer. For example, in a 32-bit system, -1 is represented as 32 ones — counterintuitive at first, yet the standard design of modern computers.
FAQ
A decimal to binary converter is an online base-conversion tool. It converts decimal integers to binary and back, supports one-value-per-line batch processing, handles negative numbers correctly, and runs entirely in your browser with no data upload.
It takes just three steps. First, type decimal or binary numbers into the left input box (one per line). Next, click the matching conversion button (e.g. "Decimal → Binary"). The result instantly appears in the right text box, which you can save with the "Copy" or "Download" button.
Both decimal and binary are supported. Binary numbers may use the 0b prefix (e.g. 0b1010), and both decimal and binary inputs support negative signs. Enter one value per line for batch conversion.
Batch conversion is fully supported. Put one value on each line and the tool converts them line by line, flagging any invalid rows. Free usage is granted every day; high-frequency or large-volume needs can be unlocked with a membership.
Conversion is instant. All calculations run locally in your browser, so there is no server waiting time — even large batches return results immediately.
Completely safe — data never leaves your device. Everything is processed locally in your browser and no data is uploaded to any server, so there is zero risk of data leaks. Feel free to convert sensitive content.
No sign-up required — use it right away. Every day you get a free quota that covers light everyday needs at zero cost. If you need a higher quota or more frequent use, a membership unlocks additional benefits.
Yes, it works on all platforms. The tool adapts to desktops, phones and tablets — just open it in your browser for a smooth conversion experience, with no app installation needed.
More efficient and more reliable. The system calculator's programmer mode forces you to switch bases, and manual math is error-prone. This tool supports batch conversion, negative-number handling and format validation, with one-click copy and download.
Check whether that line is valid. Decimal input may contain only digits and a minus sign; binary input may contain only 0 and 1 (optionally with a minus sign and the 0b prefix). Make sure each line holds exactly one value, then retry.
Negative numbers convert directly. Negative decimals become two's complement binary, and negative binary input (with a minus sign) returns the corresponding negative decimal value — ideal for low-level development and study.
Absolutely. This site also offers binary-octal, decimal-octal and decimal-hex converters, so you can combine them as needed to convert freely between multiple bases.
Content last updated：2026-07-10
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