PuzzleProof helps you guess whether a jigsaw puzzle is likely missing pieces before you leave the store. Enter the brand, piece count, and box condition. Get a clear risk band, a short explanation, and a printable checklist.
Fill in what you can see on the box. The estimator updates as you go.
Imagine you spot a 1000-piece Ravensburger puzzle at a thrift store. The box is taped, the corners are scuffed, and there is a return sticker on the back. Here is how PuzzleProof would help you decide.
Thrift puzzles come from donations, returns, estate sales, and clearance bins. Some were never opened. Some were opened, built, and repackaged by a well-meaning relative. A few were returned to the original store because pieces were missing. The box rarely tells you which story you are holding.
PuzzleProof does not open the box for you. It gives you a repeatable way to spot patterns. Over time, you will learn which brands and box conditions tend to be safe in your local stores.
Sort the border pieces first. Count them and compare to the expected edge count for that piece total. If the border alone is short by ten or more pieces, the puzzle is likely incomplete. Then sort by color and texture. Missing pieces often cluster in one section, like a sky or a dark background.
If you find a gap, check the box insert. Some manufacturers print a piece diagram or a customer service note. For older puzzles, the original publisher may be gone, but swap groups sometimes keep spare pieces or reference photos.
Saved on this device only. Nothing is sent anywhere.
No puzzles saved yet. Run a check above and click Save to inventory to start your list.
A short guide to the assumptions behind the estimator and the limits you should keep in mind.
PuzzleProof starts with a base risk for the brand. Then it adds points for box condition, seal type, and visible clues. The total maps to a band: likely complete, low risk, medium risk, caution, or high risk. The bands are intentionally conservative. When in doubt, the estimator leans toward flagging risk rather than hiding it.
Brands like Ravensburger, Schmidt Spiele, and Eurographics usually ship close to the printed count. Budget or vintage brands get more conservative assumptions because piece counts vary and quality control is less consistent. If you know a brand is reliable, you can override the result with your own notes.
It cannot count pieces through cardboard. It cannot detect a puzzle that was built, photographed, and repackaged perfectly. It also cannot predict manufacturing defects or extra pieces that were included on purpose. Treat the result as a risk guide, not a promise.
If the result is high risk and the puzzle costs more than you are willing to lose, skip it. If the result is caution but the puzzle is rare, consider opening the box in the store if the staff allows it. If you host puzzle swaps, use this estimator to pre-screen donations so you do not pass along known problems.
Last updated: 2026. Version: 1.0. Limitations: Brand patterns are based on public reports, swap-group feedback, and common manufacturing standards. Your local thrift stores may have different patterns. If you notice a brand that always fails or always passes, adjust your expectations and add a note in the estimator.