A classic opposite-meaning ladder
COLD → WARM
COLD → CORD → WORD → WARD → WARM
4 legal moves · shortest in the pinned word list.
Try this pair in the solver →One-letter steps
Free Online Word Ladder Solver
Use this free online word ladder solver with letters from three to six characters when you need a valid route, a 5-letter puzzle answer, or a short 4-step path to check. Enter equal-length start and target words in the tool. The solver searches our reviewed English dictionary and returns the shortest verified chain available for that word list. Reveal one rung at a time for a hint, or show the full path when you want to check an answer. It runs in your browser with no account, download, or email required.
Looking for a word ladder solver for a classroom, puzzle, or game? Start with any two equal-length words and use the result as a checked answer, a next-step hint, or a route to study.
Prefer a nudge before the answer? Open the hints guide →Deterministic tool
41,690 licensed words · 3–6 lettersBuild a valid ladder
Pick an example or write your own same-length pair.
Enter two words of the same length to begin.
For teachers, tutors & families
Download printable puzzles for the next class.
Your route is verified. The one-time $5 Teacher Pack adds 30 ready-made classroom ladders with answer keys, so you can print instead of preparing the next set yourself.
See the Teacher Pack · $5 →01
A checked three-move route
See exactly what one letter at a time means.
A useful solver result is a chain you can inspect, not just a word that looks close to the target.
CAT → COT → COG → DOG
This is a valid shortest path in the active three-letter dictionary: CAT → COT changes the third letter, COT → COG changes the third letter again, and COG → DOG changes the first letter. CAT and DOG differ in three positions, so no route can use fewer than three one-letter moves.
More than one shortest route can be valid. The deterministic solver may show CAT → CAG → COG → DOG instead, because it searches the same reviewed word list in a fixed order. Both routes have three legal moves; compare every adjacent pair rather than assuming that only one answer is correct.
02
Verified solver examples
Three complete word ladder paths to inspect.
Each route below is generated from the same reviewed dictionary as the solver. Open an example for progressive hints, or try the pair in the interactive tool.
Want more static answers? Browse the word ladder example library or word ladder answers before returning to the solver.
What a word ladder solver does
A word ladder changes one letter at a time while keeping every rung a valid word. The start and target must have the same length, but they do not need to be related in meaning. A solver turns that rule into a searchable graph: every accepted word is a node, and two nodes are connected when they differ at exactly one position. The useful answer is not a guess that looks close to the target. It is a complete chain that can be checked from the first word to the last.
This free online word ladder solver is designed for the moment when a puzzle is stuck but you still want to understand the route. Enter two three-to-six-letter words, run the search, and reveal only the next rung if you want to keep solving yourself. You can also show the complete path when you need to check an answer, prepare a lesson, or compare a game's accepted word list with ours. No account, download, or email is required.
How the shortest-path search works
The solver uses breadth-first search (BFS), a standard shortest-path algorithm for an unweighted graph. It starts at the first word and examines every legal one-letter neighbor at distance one. Next it examines the neighbors that are two moves away, then the next layer, and so on. Because every move costs one rung, the first time the target is reached, the route has the fewest steps available in the current dictionary. The tool records a parent for each discovered word, then follows those parents backward to reconstruct the route you see.
“Shortest” has a precise scope here. It means shortest among the words in this pinned, licensed English list and under the rule that exactly one letter changes per move. It does not mean that every game, printed puzzle book, or larger dictionary will return the same route. If two routes have the same length, the order in which the dictionary is searched can make either valid route appear first. The important promise is that each displayed edge is legal and that the route length is minimal for this word list.
Why a valid path may not appear
A “no path” result is usually a dictionary boundary, not proof that two words can never be connected in English. Word lists disagree about plurals, inflections, proper nouns, abbreviations, slang, regional spelling, and specialist vocabulary. A game may also use a private list that accepts a word we intentionally exclude. The solver reports what it can prove from the active list and does not quietly substitute a scraped or unlicensed word.
Check the input first: both words must use the same number of letters, and unusual capitalization or punctuation should be removed. If the words are valid but disconnected, try the same puzzle in the game's own dictionary or ask for a hint rather than assuming the target is impossible. Our word ladder word list shows the searchable buckets, while the source policy explains how the list is qualified and why it can differ from another solver.
How to use the solver without spoiling the puzzle
- Enter the start word and target word exactly as the puzzle displays them, with the same letter count.
- Run the search once. The result will either show a verified route or explain why no route is available in the current dictionary.
- Reveal one rung at a time if you want a nudge. Look at the changed position and continue the remaining section yourself.
- Reveal the full route only when checking an answer or teaching the one-letter rule. Every adjacent pair remains visible for inspection.
For worked examples, browse the hint-first example library. If you prefer a clue before an answer, use the word ladder hints guide. Teachers and families can also generate a fresh word ladderwith a chosen length and difficulty range.
Common word ladder solver questions
Does the solver show the only correct answer?
No. A word ladder can have multiple legal routes, including more than one shortest route. The solver returns one repeatable result from the published dictionary; check each neighboring pair instead of treating a different valid sequence as an error.
Can I use it to check a word ladder answer?
Yes. Enter the two endpoints, then reveal only as much of a route as you need. For twenty complete, static routes with every rung visible, open the Word Ladder Answers index instead of searching for an unverified daily-game result.
Why can another game or solver show a different path?
Word lists can disagree about plurals, inflections, names, slang, and specialist vocabulary. A shortest route can also be longer than the number of letters that differ between the endpoints. This tool reports what its pinned list can prove and does not invent a bridge.