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Convert binary, hex, decimal and octal online. Free number base converter for programmers.
Runs entirely in your browser — files stay on your device. No upload required.
Base 10
0b11111111
11111111
0o377
377
255
255
0xFF
FF
Convert between binary, octal, decimal, and hexadecimal with dedicated pair URLs like binary-to-hex.
Built for developers debugging low-level values and homework alike.