MS
Free
Maze Studio
Print-ready mazes at any grid size and difficulty.
Free · no account needed
14 free tools for anyone publishing print books.
Cover spine calculators, DPI checks, PDF page surgery, keyword research. Everything runs in your browser — nothing uploads, nothing costs money, no account needed to try.
The toolbox
4 live
Covers
Spine width calculator
Exact spine width and full cover size for any page count.
Money
Royalty calculator
Printing cost, royalty and margin for a KDP paperback.
Interiors
Trim size and margin guide
Bleed, margins and gutter for every KDP trim size.
Covers
ISBN barcode generator
Scannable EAN-13 barcode for your back cover.
More on the way. Every one of these runs entirely in your browser -- nothing is uploaded, nothing is stored, and none of it needs an account.
Ready to export your interior?
Create a free account to download the PDF and keep your work. Takes about ten seconds — we only need an email.
And two full apps, free once you sign up
WF
Free
Word Search Forge
Themed word searches with verified solutions.