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Number base converter

Convert numbers between all 35 bases, exactly, with two's complement.

Related tools

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Number sequence generatorGenerate a list of numbers from a start, end and step.Ordinal number converterConvert numbers into English ordinals (1st, 2nd, 3rd…).Pad string / numberPad each line to a fixed length with a chosen character, on the left or right.ASCII code converterConvert text to ASCII/Unicode code points and back.Programming case converterConvert identifiers between camelCase, snake_case, kebab-case, PascalCase and CONSTANT_CASE, one per line. Runs of capitals split correctly: parseHTTPResponse becomes parse_http_response.Column extractorExtract a single column from delimited data (CSV, TSV…). Works on a pasted block or on a file you drop in.Delimiter converterSwap the delimiter of your data — comma, tab, semicolon, pipe or space. Drop a file in rather than pasting it — it is read in your browser and never uploaded.Tabs to spaces converterConvert tabs to spaces or spaces back to tabs, with a chosen tab size.

Open Number base converter and you get an answer straight away, with no account to create. It sits under Web & network in our catalogue, alongside Number sequence generator and Ordinal number converter.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Number base converter?

Convert numbers between all 35 bases, exactly, with two's complement.

When would I actually use this?

Getting usable data out of something that was never meant to be parsed: pulling every address out of a pasted thread, turning a column of lines into a JSON array or an SQL IN clause, renaming a hundred identifiers from snake_case to camelCase in one pass.

What is the most common mistake?

Trusting an extraction to be exhaustive. A pattern that catches every address in the sample will still miss the one wrapped across a line break, the one written with a display name, and the one an email client turned into a link — count what came out against what you expected before you use the list.

How is Number base converter different from Number sequence generator?

They sit next to each other but answer different questions: Number sequence generator is the one to open when you need it to generate a list of numbers from a start, end and step. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Ordinal number converter is the closest one after this: Convert numbers into English ordinals (1st, 2nd, 3rd…).

Where do the figures come from?

Extraction runs on patterns, not on a parser: it recognises the common shapes of an address, a URL or an IP rather than validating them against their specification. That is the right trade for a paste, and the wrong one for input you are about to store.

Further reading

All guides →
ExplainerBig O Notation for Beginners: O(1), O(n), O(n squared), and O(log n) ExplainedBig O describes how an algorithm's work grows as input grows. Here is what O(1), O(n), O(n squared), and O(log n) mean and why the difference matters.ExplainerWhat Is UTF-8 and Unicode? Code Points, Byte Encoding, and Why UTF-8 WonUnicode assigns every character a code point; UTF-8 encodes those code points in one to four bytes. Here is how it works and why it beat the alternatives.How-toHow to Read Binary and Convert It to Decimal and HexLearn how binary place values work and convert binary to decimal and hexadecimal by hand, with clear worked examples.ExplainerHow Subnet Masks Work: CIDR, Network Bits, and Usable HostsUnderstand how a subnet mask splits an IP address into network and host parts, what /24 means, and how to count usable hosts.ExplainerHow Unix File Permissions Work: Reading 755 Without GuessingRead is 4, write is 2, execute is 1, and each of the three digits describes a different party. The part most explanations get wrong is what the execute bit does on a directory — it grants traversal, not the right to run anything.ExplainerPassword Entropy Explained: Bits, Length, and How Long a Password Takes to CrackWhat password entropy really measures, why length beats complexity, and how bits of entropy translate into a realistic crack time.