Hex ↔ String Converter
Convert text to hexadecimal and hex back to readable text, UTF-8 aware.
Number Base Converter
Enter a number and pick its base to see it in binary, octal, decimal and hexadecimal at once, plus any custom base from 2 to 36. Conversions use BigInt, so even very large numbers stay exact.
Private by default: processing stays on your device
YOUR NUMBER
Enter a value, pick its base
Converts as you type, with exact arbitrary-precision arithmetic.
All bases, at once.
Binary, octal, decimal, hex — plus your custom base.
Good to know
Large integers convert exactly — no floating-point rounding. Custom bases 2–36 use digits 0–9 then a–z.
Example: 255 in every base
Input
255 (decimal)Output
binary: 11111111
octal: 377
hex: ffThese buttons share the page link, not your input.
Want to include your text?
Your current input will be stored in the link after the # symbol, not uploaded to Handy Browser Tools. Anyone with this link can read that text. If you send or post it, the service you choose also receives the link. Do not include passwords or private information.
Frequently asked questions
What bases are supported?
Any base from 2 to 36 in both directions. Binary, octal, decimal and hexadecimal are shown automatically, and the custom base field covers everything in between (digits 0-9 then a-z).
Does it handle very large numbers?
Yes. Conversions run on JavaScript BigInt, so there is no 2^53 precision limit. 40-digit numbers convert exactly. Negative numbers and a leading 0x/0o/0b prefix are accepted too.
Can I paste grouped digits like 1010_1010?
Yes. Spaces and underscores are ignored, so grouped binary or long hex values paste cleanly.
Is my input sent anywhere?
No. Every conversion happens locally in your browser; nothing is uploaded.
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