How do I create a palindrome from text?

The tool appends a reversed version of the input. Choose whether the last character appears twice at the center or appears once.

What is the difference between abcba and abccba?

Both mirror abc around the center. The repeated-center option produces abccba, while omitting the repeated final character produces abcba.

Can I create a palindrome for each input line?

Enable line-by-line processing. The tool mirrors each line independently instead of treating the entire multiline input as one string.

palindrome Builder | Tool Factory

Tool workspace

Your input stays in this browser.

Needs input

You can run the tool again after any change.

Input text

Palindrome options

Repeat the final character

Process each line separately

Your result appears here

Create palindrome from the supplied input and options. Enter the text, set the transformation rules, then copy the result.

This tool runs open-source code from OmniTools (MIT License). See open-source credits.

palindrome Builder: Palindrome Builder appends a reversed copy of your text to create a mirrored sequence. With Repeat the final character enabled, abc becomes abccba. Disable that setting to produce abcba. This tool builds a palindrome; it does not check whether the original text is one.

The result contains the original text followed by its reverse. The center setting decides whether to duplicate the final character.

Build small palindrome examples for a lesson or test.
Create mirrored labels while keeping the original text at the start.
Generate one mirrored result for each line of sample text.

Instructions

Enter abc in the text input.
Enable Repeat the final character for abccba, or disable it for abcba. Enable Process each line separately for independent lines.
Run the tool. Compare the center characters and check that spaces and punctuation remain where you expect.

Example

Input: race

Settings: Repeat the final character: on, Process each line separately: off (the defaults)

Result: raceecar

Turn off Repeat the final character to get racecar. The last letter then appears once, in the middle.

Limits

The tool keeps case, spaces, and punctuation. It does not normalize phrases or remove separators.
Reversal uses UTF-16 code units. Emoji and characters with combining marks can produce broken or unexpected results.
Without Process each line separately, the tool reverses line breaks along with the rest of the input.