How to Swap Letters in Words Online (2026)
Use our free Swap Letters in Words tool to transpose letters within each word using different swap modes. Swap adjacent letter pairs (like simulating typing errors), swap the first and last letters of each word, or swap letters at custom positions. Case-sensitive swapping and word boundary preservation options give you full control.
How Letter Swapping Works
Letter swapping exchanges the positions of letters within words according to your chosen mode. Adjacent swap exchanges each letter with its immediate neighbor (position 0↔1, 2↔3, etc.). First/last swap moves the first letter to the last position and vice versa. Custom position swap lets you specify any two positions to exchange. This is useful for creating word puzzles, simulating common typing mistakes, generating word variations, and exploring letter patterns.
How to Use Our Letter Swapper
- Paste or type text into the Swap Letters in Words input area.
- Choose the swap mode: Adjacent, First/Last, or Custom Positions.
- If using Custom mode, enter the two letter positions to swap.
- Toggle case-sensitive swap and other options as needed.
- Copy the transformed result to your clipboard.
Example Letter Swaps
| Input | Mode | Output |
|---|---|---|
| hello | Adjacent | ehllo |
| world | Adjacent | owrld |
| hello | First/Last | oellh |
| world | First/Last | dorlw |
| abcdef | Custom (2, 4) | abedcf |
Common Use Cases
- Word puzzles — create scrambled word variations for games, riddles, and brain teasers.
- Typo simulation — generate text that mimics common transposition typing errors for testing.
- Creative writing — produce unusual word forms for experimental poetry and wordplay.
- Cryptography exercises — demonstrate simple transposition ciphers with letter swapping.
FAQ
What does “swap adjacent letters” mean?
It swaps each pair of adjacent letters in a word. For example, “hello” becomes “ehllo” (h↔e, l↔l, l↔o). If there is an odd number of letters, the last one stays in place.
Does this affect numbers and symbols?
By default, only letters (A-Z, a-z) are swapped. Numbers and symbols are left in place. Toggle “swap all characters” to include them.
What is “first/last” swap mode?
It exchanges the first and last letters of each word while leaving interior letters in their original order. For example, “hello” becomes “oellh”.
Can I swap letters at any two positions?
Yes. Custom mode lets you specify any two positions (0-indexed) to swap within each word.
Does case-sensitive swapping work?
When enabled, only letters matching the same case are swapped. When disabled, case is preserved during the swap operation.
Try our free Swap Letters in Words tool to transpose letters with three swap modes and full position control.