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Hexadecimal to Decimal
About This Tool
Hexadecimal to Decimal is a free daily-quota online decimal to hex converter that requires no installation and no registration — ready to use in seconds. Enter decimal or hexadecimal 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 debugging CSS colors, analyzing memory addresses or handling data encodings, this tool delivers accurate, professional-grade results effortlessly.
How to Use
- Enter numbers
Type decimal or hexadecimal numbers in the left input box, one per line. Hex values may use the
0xprefix - Pick direction
Click the "Decimal → Hex" or "Hex → 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
- CSS color debugging: convert between decimal RGB values (e.g. 255,0,0) and hex color codes (#FF0000)
- Address analysis: switch quickly between decimal and hex while debugging programs and analyzing memory addresses or file offsets
- Encoding work: easily convert values in hex-based data such as MAC addresses and Unicode encodings
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, with automatic validation that pinpoints the exact invalid line number
- Prefix Friendly
Auto-recognizes
0x/0Xprefixes and accepts upper- or lowercase hex, outputting results in uppercase notation - Works on All Devices
Runs smoothly on desktop, mobile and tablet — just open your browser, regardless of operating system
Common Color Reference
Here are the hex and decimal equivalents of frequently used web colors for quick conversion:
| Color | Hexadecimal | Decimal |
|---|---|---|
| Black | #000000 | 0 |
| Red | #FF0000 | 16711680 |
| Green | #00FF00 | 65280 |
| Blue | #0000FF | 255 |
| White | #FFFFFF | 16777215 |
| Orange | #FFA500 | 16753920 |
Typical Uses of Hexadecimal
Hexadecimal represents values with 16 symbols (0-9 and A-F), and two hex digits correspond exactly to one byte (8 bits), which is why it is widely used in memory addresses, color coding and network protocols.
In web design, colors are usually written as #RRGGBB. Converting each color channel's decimal value to hex lets you compose any color — this tool makes that conversion quick and easy.
FAQ
A decimal to hex converter is an online base-conversion tool. It converts decimal integers to hexadecimal 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 hexadecimal numbers into the left input box (one per line). Next, click the matching conversion button (e.g. "Decimal → Hex"). The result instantly appears in the right text box, which you can save with the "Copy" or "Download" button.
Both decimal and hexadecimal are supported. Hex values may use the 0x or 0X prefix (e.g. 0xFF) or consist of A-F digits directly, in either case. Negative signs and multi-line batch input are also supported.
Batch conversion is fully supported. Put one value on each line and the tool converts them line by line, reporting the exact line number for any invalid input. 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 intuitive. System calculators force you to switch bases manually, and CSS color math requires per-channel calculation. This tool offers batch conversion, automatic prefix detection and line-level error hints, with one-click copy and download.
Check the input on the reported line. Decimal input may contain only digits and a minus sign; hex input may contain only 0-9, A-F and a minus sign (optionally with the 0x prefix). Make sure each line holds exactly one value, then retry.
Results are output line by line in clear form. Decimal-to-hex results appear in uppercase (e.g. 255 becomes FF), while hex-to-decimal results return the corresponding decimal integer — easy to copy and use directly.
Absolutely. This site also offers decimal-binary, binary-octal and decimal-octal converters, so you can combine them as needed to convert freely between multiple bases.
Content last updated：2026-07-10
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