Create Palindrome

A palindrome is text that reads the same forwards and backwards (like "racecar" or "madam"). This tool creates palindromes by taking your input text and appending its reverse. For example, "race" becomes "raceecar" (standard mode) or "racecar" (overlap mode, which shares the center character). You can also choose Reverse First mode to place the reversed text before the original, creating "ecarrace" instead. It's perfect for wordplay, creative writing, and generating test data.

Non-Overlap Mode (default): Simply concatenates your text with its reverse. "race" becomes "raceecar" (notice the double 'e'). Overlap Mode: Shares the center character to create cleaner palindromes. "race" becomes "racecar" (single 'e' at the center). The overlap mode is ideal for creating natural-sounding palindromes and mimicking classic examples like "racecar" or "madam." Use non-overlap when you want maximum symmetry without character merging.

Yes! Click the Upload button to load .txt or .md files. The tool processes your text entirely in your browser—no server uploads, complete privacy. After creating palindromes, click Save to download the results as a .txt file. Perfect for processing word lists, generating test data for coding projects, or creating multiple palindromes at once. Combined with Batch Mode, you can process entire files line-by-line.

Batch Mode processes each line of your input separately, creating a unique palindrome for every line. Without batch mode, all lines are treated as one block. Example: Input "hello\nworld" → Batch ON creates "hellolleh\ndlrowworld". Batch OFF creates "hello\nworlddlrow\nolleh". Use batch mode when processing lists of words (name lists, product codes, test data) where you want each item to become its own palindrome. Essential for bulk processing and maintaining line-by-line structure.

Click Show Comparison to toggle a side-by-side view displaying your original text (in red) next to the palindrome result (in green). This visual comparison makes it easy to: (1) See exactly how the palindrome was formed, (2) Verify the transformation worked correctly, (3) Understand the effect of overlap and reverse-first options, and (4) Present results to others (teachers, clients, team members). Great for educational purposes and explaining palindrome concepts visually.

The statistics panel shows four key metrics: (1) Input (blue): Original text character count, (2) Output (green): Palindrome character count, (3) Added (orange): Number of characters added (Output minus Input), and (4) Lines (purple): Number of lines in your text. These metrics help you understand the transformation scope, verify processing worked correctly, and track text expansion—useful for text size limits, database constraints, or understanding palindrome structure.

Absolutely! The tool works with any text length—single words, sentences, paragraphs, or entire documents. Note that technical palindromes (reading the same forwards and backwards) typically ignore spaces, punctuation, and capitalization. This tool creates structural palindromes by simply reversing the character sequence. For example, "Step on no pets" becomes "Step on no petsstepon on petS". While not a true linguistic palindrome, it creates symmetrical, mirrored text perfect for visual effects, coding challenges, and creative wordplay.

Completely safe. All processing happens 100% in your browser using JavaScript. Your text never leaves your device, isn't sent to any server, isn't logged or stored anywhere. Even uploaded files are processed locally. You can verify this by checking your browser's Network tab—no data transmission occurs. This is a privacy-first tool ideal for processing sensitive text, confidential documents, or any data you don't want to upload to external servers.

Creative Writing: Generate unique text patterns for poetry, word puzzles, or artistic projects. Programming: Create test data for string manipulation algorithms, validate palindrome checkers, or generate symmetric data structures. Branding & Design: Create symmetrical names/logos that look visually balanced. Education: Teach string reversal concepts, demonstrate symmetry, or create engaging word games. Games & Puzzles: Design word challenges, cryptographic puzzles, or brain teasers. Data Testing: Generate edge cases for text processing systems that need to handle reversed or symmetric strings.

After generating your palindrome, click the Save button (download icon) in the output section. The tool creates a .txt file named palindrome-[timestamp].txt and downloads it to your device. The file contains exactly what you see in the output area—all palindromes, preserving line breaks if you used batch mode. No formatting is lost, and the download happens instantly. Perfect for saving bulk processing results, archiving generated data, or sharing palindromes with others.