A fill-in maker for kids and adults
Printable PDF in one click
No editor and no account: choose your options and the PDF downloads straight away, in US Letter or A4.
One way to fill each grid
Every grid is checked before it is printed: if two words could swap places, one more word is written into the grid.
Easy to Expert
Easy grids hold 8 words and a starter word; Expert grids 20 long words and no starter word.
Fill-ins for kids
Short, friendly words in big squares, sorted by length — great spelling practice for the classroom.
Answer key included
A solution page shows every word in place, so checking the puzzle takes seconds.
Need a whole book?
Wisdom Effect builds complete fill-in books for Amazon KDP: hundreds of puzzles, your own words, Large Print, title pages and a commercial license.
How to print a fill-in puzzle
- 1Choose classic puzzles or puzzles for kids.
- 2Pick a theme, a difficulty and how many puzzles go on the page.
- 3Keep the answer key on or off and choose US Letter or A4.
- 4Click Download PDF and print it.
Free fill-in generator FAQ
How do you solve a fill-in puzzle?
Start from the word already in the grid and look at the squares that cross it. Find a word in the list with the right length and the right letter in that place, write it in and tick it off. Lengths with only one word are the easiest places to begin.
Is this fill-in generator really free?
Yes. No account, no credit card and no watermark across the puzzles — just a small source line at the bottom of each page.
Does every puzzle have one solution?
Yes. Before a puzzle goes on the page, a solver tries every way the words fit the grid. If more than one works, another word is printed in the grid.
Can I sell these puzzles or publish them on Amazon KDP?
Not the free ones — they are for personal and classroom use only. For books you sell, create a fill-in book in Wisdom Effect: books generated on paid plans and with credit packs come with a full commercial license.
Are the puzzles different every time?
Yes. Every PDF is generated from a new random code, so each download gives you brand-new grids.
Do the puzzles come with answers?
Yes. An answer page with every word in place is added by default; switch it off if you only want the puzzles.
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Want a whole fill-in puzzle book?
Generate 100+ fill-ins with one solution each, your own word lists, Kids and Large Print editions and KDP-safe margins. Free trial with 100 credits, no credit card.