Generate Big Integers

The Generate Big Integers tool lets you create a list of massive random integers in your browser. You can control how many numbers to generate, how large each number is (in bits), and how they’re formatted no server involved. Whether you’re testing crypto code, doing math experiments, or just need big numbers fast, this tool’s got you covered.

It supports things like leading zero padding and various output styles (line-by-line, JSON, CSV, or space-separated). Input and output update live, with file import, copy/export options, and a responsive layout built for clarity and control.

Generate Big Integers is entirely client-side and safe for any use where big numbers matter.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .csv, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
Total items: 0
Options
Pad with leading zeros
Maximize output
Output format:

How to Use:

  • Enter a number in the input box this tells the tool how many integers to generate.
  • Optionally, import a file with a single number if you’d rather not type.
  • In the Options box:
    • Use the “Pad with leading zeros” switch to left-pad numbers to their full width.
    • Set the bit length (defaults to 128 bits) to control how big each number is.
    • Pick your output format:
      • One per line
      • CSV (comma-separated)
      • JSON array
      • Toggle Maximize output if you want more room in the output area.
  • The output updates instantly and flashes to show changes.
  • Copy the results using the Copy Output button.
  • Save them with Export to File.
  • Hit Clear All to reset everything.

What Generate Big Integers can do:

  • Generate any number of very large random integers (128-bit or more).
  • Choose between different formatting styles to suit your workflow JSON for devs, CSV for spreadsheets, or plain text.
  • Easily copy or export the output to a file, right from your browser.
  • Import how-many-to-generate values from a file (.txt, .json, etc.).
  • Use toggle switches for clean control over output behavior.
  • Maximize the output area when working with tons of digits.
  • Fully client-side, so nothing is uploaded ever.

Example:

Input:

3

Options:

  • Bit length: 128
  • Format: JSON
  • Leading Zeros: off

Output:

[
  "314254985486292317254178995486112321",
  "879845129999155422488712348877454213",
  "112334985774522117777112341547896522"
]

Common Use Cases:

If you need huge integers fast for cryptography tests, blockchain tooling, stress testing algorithms, or mocking up data this tool handles it without needing Python scripts or online APIs. It’s fast, safe, flexible, and just works in your browser.

Useful Tools & Suggestions:

If you’re working with Generate Big Integers, try Highlight Integers to visually flag the largest or most interesting ones. And if you want to double-check size or structure, Print Integer Information gives you a detailed look at each value.

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