Number base converter

Number Base Converter

Paste one number or a list, in any base, and read each in decimal, hex, binary and octal. Big numbers keep every digit, and negative ones can be shown as a CPU stores them.

How do I use the Number base converter?

1. Type numbers, one per line: 255, 0xff, 0b1010 or 0o17.
2. Read every base side by side, with digits grouped.
3. Pick a bit width to see negatives as two's complement, or show one base to copy.

What does the Number base converter do?

• Numbers of any size, exactly (BigInt)
• 0x, 0b, 0o and # prefixes, and _ between digits
• Two's complement in 8, 16, 32 or 64 bits
• Hex and binary grouped in fours
• One base only, as plain text
• Copy gives every row as JSON

Frequently asked questions

Is my data uploaded?

No. Bracely runs entirely in your browser, so nothing you paste or open leaves your device.

More JSON tools

Bracely has more than 65 JSON tools in one page. Related ones:

• Colour converter
• ENV ⇄ JSON
• cURL to code
• GraphQL request
• MessagePack ⇄ JSON
• Parquet viewer
• Avro viewer
• JSON to YAML
• JSON to CSV
• JSON to XML
• JSON to Excel
• YAML to JSON
• CSV to JSON
• XML to JSON
• JSON Schema validator
• JSON data dictionary
• JSON pipeline
• JS macro
• JSON Formatter
• JSON Validator
• JSON Viewer
• JSON Repair
• JSON Diff
• jq Playground

Runs entirely in your browser. Nothing you paste is uploaded. Made by Saurabh Pagrut. About · Privacy policy
Last updated 22 October 2026 · Version 4.9 · Changelog
Saurabh Pagrut on GitHub · LinkedIn · X · YouTube · Instagram