Number Base Converter

Convert large integers between binary, octal, decimal and hexadecimal without precision loss.

Processed locally in your browser. Your input is not uploaded.

How to use Number Base Converter

Choose the source base and enter integer digits, with an optional leading plus or minus sign. Results include all four bases.

Details and limits

Conversion uses BigInt rather than floating-point numbers. Prefixes, separators and fractions are not accepted. Input is limited to 4,096 characters to keep output manageable.

More tools you might find useful.

Base64 Encoder & Decoder Encode or decode Base64 text locally.
CSV ↔ JSON Converter Convert CSV with headers to JSON or flat JSON objects to properly escaped CSV.
Color Converter Convert HEX, RGB and HSL colors with normalized values and a local preview.
HTML Entity Encoder & Decoder Encode HTML special characters or decode named and numeric entities into plain text.
Hash Generator Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of local text or files.
JSON Formatter Format, validate and minify JSON data.
JWT Decoder Decode JWT headers and payloads directly in your browser.
Regex Tester Test JavaScript regular expressions and inspect matches, captures and positions.
URL Encoder & Decoder Encode or decode URL-safe text.
UUID Generator Generate random UUID v4 identifiers instantly.