Python String zfill() Method

Last Updated : 5 Jan 2026

Python zfill() method fills the string at left with 0 digit to make a string of length width. It returns a string contains a sign prefix + or - before the 0 digit.

It returns original length string if the width is less than string length.

Syntax of Python String zfill() Method

It has the following syntax:

Parameters

• width: length of the string.

Return

It returns a string.

Different Examples for Python String zfill() Method

Let's see some examples of zfill() method to understand it's functionality.

Example 1

Let's see an example which has width greater than string length. It returns a new string containing 0 to the left and total length is equal to width.

Output:

Example 2

Here, we are passing width less than the string length therefore it returns the original string without filling zeros to the left.

Output:

Example 3

This example describes the sign either + or - includes before the zero fills to the left of the string. See every value is filled after prefixing (+ or -) sign.

Output:

+000000100
-000000200
-0-Rohan--