Convert Any Number to Any Base

Every number can be written in any base: binary (2), octal (8), decimal (10), hex (16), base-36, even base-7 or base-23. The value never changes - only the spelling does. A universal converter folds all those conversions into one tool: pick a source base and a target base, and any number travels between them exactly.

Convert Any Number to Any Base accepts a source base and a target base, both from 2 to 36, and converts up to 1000 numbers per run with exact BigInt arithmetic. Lowercase input is normalised, output case is your choice, and every result copies or downloads.

• Base 2 to 36: Any source and any target.
• Exact BigInt: Every conversion exact at any size.
• Batch mode: Up to 1000 numbers per run.
• Case choice: Uppercase or lowercase letters.
• Self-validating: Illegal digits flagged per line.
• Copy or download: Export all results.

1. Choose the source base - the base your input uses (2-36).
2. Choose the target base - the base your output uses (2-36).
3. Enter numbers - one per line in the source base.
4. Pick output case - uppercase or lowercase letters.
5. Generate - and read the target-base results.

1. Binary to hex: source 2, target 16, input 10101010 gives AA.

2. Hex to binary: source 16, target 2, input A gives 1010.

3. Decimal to base-36: source 10, target 36, input 1296 gives 100.

4. Base-3 to base-27: source 3, target 27, input 1212 gives 45.

5. Octal to decimal: source 8, target 10, input 377 gives 255.

• One tool, all bases: Every pair from 2 to 36 in a single page.
• Exactly right: BigInt arithmetic, zero rounding.
• Batch power: Hundreds of conversions at once.
• Case control: Letter output exactly as you like it.
• Copy or download: Results export in one click.
• Private and free: Everything runs in the browser; nothing is uploaded or logged.