Base / Radix Converter
Convert any integer between base 2 and base 36. Input is parsed with BigInt, so arbitrarily large values stay exact — handy for bitmasks, hashes, IPv6 math and color values. Results for the common bases are shown at a glance and each is copyable.
🔒 Privacy: all processing happens locally in your browser. Nothing is uploaded.
Frequently asked questions
What is the largest number supported?
Because values use BigInt, there is no fixed upper limit — only your browser’s memory. Input can also be negative.
Which characters are used for high bases?
Digits 0-9 are followed by a-z, so base 16 uses 0-9a-f and base 36 uses 0-9a-z.
Related tools
JSON Formatter
Format, validate and minify JSON in your browser. No data is ever uploaded.
JSONValidateMinify
JSON Diff
Compare two JSON documents side by side and see differences instantly.
JSONCompareDiff
JWT Decoder
Decode JWT tokens, inspect the header and payload, and verify signatures.
JWTTokenAuth
Base64 Encoder/Decoder
Encode text or files to Base64, or decode Base64 back to readable text.
Base64EncodeDecode