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- 2Adjust
- 3Download
Number Base Converter online, free
Simultaneously convert numbers across binary (base 2), octal (base 8), decimal (base 10), hexadecimal (base 16), Base32, and Base58.
- Runs in your browser — no upload
- Free, no sign-up, no watermark
- TXT
How to use Number Base Converter · Number Base Converter — frequently asked questions
How to use Number Base Converter
- 1
Add your TXT file
Drop a file on the page, paste it, or click Select Files. Nothing is uploaded — it opens straight in your browser.
- 2
Fine-tune the settings
Set source base in the Fine-tune panel, or keep the defaults — they suit most files.
- 3
Run Number Base Converter
Press the start button. Processing happens on your device, usually in seconds.
- 4
Download the result
Save the finished file, or continue with another tool without downloading in between.
What Number Base Converter can do
- Source Base: 2, 8, 10, 16, 32 and 58
- Private by design — files are processed in your browser and never uploaded
- Free with no sign-up, no watermark and no daily limit
Common tasks
Number Base Converter — frequently asked questions
Which numeral bases are supported?
The tool simultaneously converts across Binary (Base 2), Octal (Base 8), Decimal (Base 10), Hexadecimal (Base 16), Base32, and Base58 numeral systems.
Can it handle large numbers?
Yes. The converter utilizes native JavaScript BigInt arithmetic, allowing precise conversion of arbitrarily large integers without floating-point precision loss.
What is Base58 and why is it useful?
Base58 is an alphanumeric encoding format popularized by Bitcoin and cryptocurrencies. It avoids ambiguous characters such as `0` (zero), `O` (capital o), `I` (capital i), and `l` (lowercase L) to prevent transcription mistakes.
Does it support two's complement and bitwise byte views?
Yes. For binary and hexadecimal representations, the tool formats padded bytes and groups digits (such as 4-bit nibbles or 8-bit octets) for clear readability.
Is my data processed locally?
Yes. All numeric parsing, BigInt math, and base conversions happen 100% on device in your browser with zero server transmission.
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