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Convert Number Bases Between Binary and Hex for Free

Convert binary, octal, decimal and hexadecimal numbers online for free. Choose the input base and inspect the parsed result; very large integers can lose JavaScript precision.

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Number Base Converter

Choose your input to begin
  1. Add input
  2. Choose options
  3. Process
  4. Use your result
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Full instructions and common questions

Free use and requirements

Use this tool for free without a KitNelo account. Processing runs in your browser; input limits, browser support and device memory still apply.

Uses JavaScript number parsing; very large integers can lose precision and invalid suffixes may be ignored.

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Free online functions: steps and checks

Convert Decimal to Binary for Free

Enter the number with decimal selected as its input base and read the binary output. Check the parsed value before copying the digits, particularly when working with integers large enough to exceed JavaScript precision.

Convert Hexadecimal to Decimal for Free

Provide hexadecimal digits and select the hexadecimal input base to view a decimal representation. Inspect the complete source string because JavaScript number parsing can ignore an invalid suffix instead of rejecting every character.

Convert Binary, Octal, Decimal and Hex for Free

Choose the source base and enter a number to inspect its four supported representations together. Verify the parsed value and output before reuse; oversized integers may round and invalid trailing characters can be ignored.

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