Swap Letters in Words

Find & Replace is sequential (one-way). If you replace 'a' with 'b', all 'a's become 'b's. Then replacing 'b' with 'a' would convert everything to 'a', including the original 'b's. Swap is bidirectional (two-way). It exchanges 'a'↔'b' simultaneously in a single pass: 'a' becomes 'b' AND 'b' becomes 'a', preserving the original distribution. Example: 'apple banana' becomes 'bpple abnbnb' (swapping a↔b), not 'bpple bbnbnb' like sequential replacement would.

Case Sensitive means 'A' and 'a' are treated as different characters—only exact matches are swapped. With this OFF (default), 'A' and 'a' are both matched. Preserve Case Pattern (only works when Case Sensitive is OFF) maintains capitalization structure: if you swap 'a'↔'o', 'Apple' becomes 'Opple' (capital stays capital), while 'apple' becomes 'opple'. Without Preserve Case, 'Apple' would become 'opple' (lowercase o). Use Preserve for natural-looking results.

Whole Words Only swaps characters ONLY when they form complete standalone words (surrounded by spaces or punctuation). Example with 'a'↔'i': "I am a human" → "A im i humen" (only standalone 'I' and 'a' swap, not 'a' inside 'am' or 'human'). Without this option, ALL occurrences swap: "I am a human" → "A im i humen" (every 'a' and 'i' swaps). Use Whole Words for word-level swaps, leave it off for character-level manipulation.

When Highlight Changes is enabled, the output shows swapped characters with yellow highlighting. This lets you instantly see which letters were affected and verify the swap worked correctly. Example swapping 'o'↔'a': "Hello world" shows 'e' and 'a' highlighted where they replaced 'a' and 'o'. Perfect for visual verification, debugging swaps, or analyzing patterns. Disable highlighting to see clean text for copying/downloading.

Yes, absolutely. You can swap multi-character strings, not just single letters. Examples: swap 'ing'↔'ed' to transform verb tenses ('running' → 'runned', 'walked' → 'walking'), swap 'http'↔'https' to update URLs, swap 'Mr.'↔'Ms.' in documents, or swap programming keywords. The tool works on any character sequence. Just enter the strings in the input boxes—works the same as single letters. Useful for bulk text transformations beyond simple character replacement.

Ciphers & Encryption: Simple substitution ciphers (swap 'a'↔'z', 'b'↔'y' for basic obfuscation). Data Cleaning: Fix reversed delimiters (swap ','↔';' in CSV files), correct encoding issues (swap curly quotes↔straight quotes). Programming: Swap variable names in code ('foo'↔'bar'), update API versions ('v1'↔'v2'). Text Games: Create anagram puzzles by swapping strategic letters. Typo Correction: If you consistently mistype 'ei'↔'ie' (receive/recieve), batch-fix errors. Creative Writing: Experimental text transformations for artistic effects.

The statistics panel shows: Swaps (total number of character exchanges performed), Changed (percentage of text affected—useful to verify swap density), Words (total word count in input), and Characters (total character count). The 'Changed' percentage is particularly useful: if it's 0%, your swap inputs might not exist in the text; if it's unexpectedly high, you might be swapping common letters unintentionally.

Yes, all characters work—letters, numbers, symbols, punctuation, Unicode, emojis, etc. Examples: swap '.'↔'!' to change period-ending sentences to exclamations, swap '0'↔'O' (zero/letter O) to fix OCR errors, swap '😀'↔'😢' to reverse emoji sentiment, swap '\'↔'/' to fix file paths. The tool handles any character your keyboard can type or paste. Special regex characters (like ., *, +, ?) are automatically escaped, so they work safely.

Yes! Click the ⇄ button between the 'First Letter' and 'Second Letter' input boxes to instantly swap their values. Useful when you realize you entered them backwards or want to reverse a previous swap operation. Example: if you swapped 'a'→'e' and want to undo it, click the swap button to reverse the inputs and the transformation automatically reverses in the output.

100% secure. All swapping happens entirely in your browser using JavaScript. Your text never leaves your device, isn't uploaded to servers, isn't logged, and isn't stored. Even uploaded files are processed locally—no network transmission. Check your browser's Network tab to verify zero data transfer. Essential for processing sensitive documents, confidential code, password lists, or proprietary data. This is a privacy-first, client-side tool.