String pad to the column in R

Need to format your character columns for cleaner output or reporting?

In R, string padding allows you to add characters like "#" to the left, right, or both sides of a string.

Whether it’s for aligning data or prepping CSV exports, str_pad() from the stringr package makes it easy.

In this tutorial, we’ll walk through three ways to pad strings in R using a practical example.

🧪 Step 1: Create Sample Data in R

r

df <- data.frame(
  State = c('Kerala', 'TN', 'AP', 'HYD', 'GOA'),
  Score = c(622, 247, 455, 174, 321)
)
df

✅ Output:

🔹 1. String Padding to the Left

Use str_pad() with the default side = "left" to pad characters to the left of each string.

r

library(stringr)
df$StateLeft <- str_pad(df$State, width = 12, pad = "#")

🎯 Result:

🔸 2. String Padding to the Right

To pad characters on the right, set side = "right".

r

df$StateRight <- str_pad(df$State, width = 12, side = "right", pad = "#")

🎯 Result:

🔸 3. Padding on Both Sides

For symmetric padding, use side = "both".

r

df$StateBoth <- str_pad(df$State, width = 12, side = "both", pad = "#")

🎯 Result:

🧠 Why String Padding Matters

• Align outputs in reports and dashboards
• Format export files and logs
• Add structure to categorical data

✅ Conclusion

The str_pad() function in R is a versatile tool for formatting string columns. Whether you need left, right, or full-width padding, stringr provides a simple and consistent solution.

Explore more R tips at Finnstats and master your data one line of code at a time!