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Test Printf Online

Preview printf format strings with width, precision and flags.

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How do you test printf online?

Testing printf online lets you preview how a printf-style format string renders without compiling anything. Snabbit reads your format on the first line and the arguments below it, then fills specifiers like %d, %x, %05.2f and %s, including width, precision and flags. It runs in your browser, so your format strings and data stay private.

How to use the Test Printf Online

  1. 1 Type your printf format string on the first line.
  2. 2 List the arguments on the following lines, comma or space separated.
  3. 3 The formatted output appears instantly.
  4. 4 Copy the result.

What you can use it for

  • Checking a format string before using it in code.
  • Learning how printf flags and widths behave.
  • Demonstrating number formatting in lessons.
  • Debugging misaligned printf output.

Frequently asked questions

Which conversion specifiers are supported?
Integer (%d, %i, %u), octal (%o), hex (%x, %X), floating point (%f, %e, %g), string (%s), character (%c) and a literal percent (%%) are all handled.
Do width and precision work?
Yes. Patterns like %5d, %.2f and %08.3f apply width, precision and zero-padding, and the - flag left-aligns within the field.
How do I include a newline in the output?
Put a \n in your format string. Backslash escapes are processed, so \n and \t turn into a real newline and tab in the result.

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