How-to guide
How to convert decimal to binary or hex
Press ⌘K with TabCmdr and type 255 to binary or 255 to hex. To go back, type the number with its prefix: 0xff to decimal gives 255. Enter copies it.
Quick answer
Convert a number in three steps
- ⌘K
Step 1
Open the palette
Ctrl+K on Windows and Linux. Works on any page.
- 255 to binary
Step 2
Type the number and base
The answer shows at the top of the list.
- ↵
Step 3
Press Enter
The answer is copied, ready to paste.
Chrome's way
Use Google Search’s calculator
Google lists base conversion among the things its search calculator can do. Type the conversion into the search box on google.com.
You can search from Chrome’s address bar too. If Google is your default search engine, type the conversion there and press Enter. In some countries Google is Chrome’s default, and in others Chrome asks you to pick one.
Sources: Google’s calculator and unit converter and default search engine help pages, checked in October 2026.
TabCmdr's way
Convert numbers in the TabCmdr palette
TabCmdr is a keyboard launcher that lives in your browser. Its search box converts between decimal, hexadecimal, binary and octal as you type.
Before you start: add TabCmdr from the Chrome Web Store. It has a 7-day free trial and needs no account.
Step 1: Open the palette
Press ⌘+K on a Mac or Ctrl+K on Windows and Linux, on any page.
Step 2: Type the number and the base you want
Type a number, to, and the base: hex, binary, octal or decimal. The short forms bin, oct and dec work too. The answer shows under Calculator at the top of the list.
255 to binary gives 0b11111111.The answer starts with a prefix that names its base: 0x for hex, 0b for binary and 0o for octal.
Step 3: Press Enter to copy
The answer row is already highlighted. Press Enter and TabCmdr copies it and closes the palette. For 255 to binary, a “Copied 0b11111111” message shows at the bottom of the page.
Convert back to decimal
To turn a hex, binary or octal number into decimal, type it with its prefix, then to decimal:
0xff to decimal gives 255.| You type | You get |
|---|---|
255 to hex | 0xff |
42 in hex | 0x2a |
64 to octal | 0o100 |
0xff to binary | 0b11111111 |
0b1010 to decimal | 10 |
0o17 to decimal | 15 |
1010 bin to decimal | 10 |
ff to decimal | 255 |
deadbeef to decimal | 3735928559 |
No prefix? Name the base after the number instead, like 1010 bin. A number made only of digits is read as decimal, and one with the letters a to f in it, like ff, is read as hex.
If no answer shows up
- The number has a decimal point. Only whole numbers convert, so
1.5 to binarygives no answer. - The digits don’t fit the base. Binary only uses 0 and 1, and octal only uses 0 to 7, so
0b102 to decimaland0o89 to decimalgive no answer. - You wanted a color. A HEX color like
#1a73e8converts withto rgb. The color conversion page covers colors.
Try it on your own tabs
Works in Chrome, Edge, Brave, Arc, Vivaldi and Opera.
Install for Chrome