Spine — Print Book Setup & Cover Wrap

Spine — Print Book Setup & Cover Wrap — a premium, 100% offline digital tool by Aceplore. Runs entirely in your browser: no accounts, no subscriptions, your data never leaves your device.

A private, offline print-file calculator — spine width from your real page count and paper stock, the full cover wrap with bleed drawn to scale, interior margins and gutter, page-count rules and an ISBN check-digit validator — 32 tools in one, so the cover fits the first time.

32 built-in tools in one app. A book list with a full print specification per title and saved presets; standard trim sizes with a custom-trim validator; spine width computed from page count and an editable paper stock, spine-text clearance, and a paper-stock table you can edit because printers differ; the full cover wrap with bleed, drawn to scale as a diagram showing back panel, spine, front panel, bleed and safe area, plus barcode clear space, hardcover case, dust jacket panels and flaps and endpaper notes; interior margins and a gutter that grows with page count, page-count rules and a page estimate from your word count; colour mode guidance, the pixel dimensions your wrap needs at 300 DPI, font embedding notes, an ISBN register with a real check-digit validator, a pre-upload proof checklist and a per-book checklist; plus an inch/millimetre converter with fractions, a glossary, reports, CSV export and settings.

Spine Width & Paper Stocks. Spine width is page count times the thickness of one page of your actual paper stock — so the stock table is editable, the arithmetic is shown, and the answer is given to four decimal places in inches and to two in millimetres.

Cover Wrap & Wrap Diagram. Full wrap width is two trim widths plus the spine plus bleed on both sides, and the diagram draws it to scale — back panel, spine, front panel, bleed and safe area — so a designer can work straight from it.

Resolution, ISBN & Proof. The pixel dimensions your wrap needs at 300 DPI, an ISBN validator that actually computes the check digit rather than trusting the number, and a pre-upload checklist for the things that get files rejected.

What's included:

• Spine.html
• Quick-Start-Guide.html
• How-To-Use-Guide.html
• README.txt
• LICENSE.txt

Includes a personalized welcome wizard, an interactive guided tour, a ⌘K command palette, light/dark themes with 8 accents, and one-click JSON backup & restore.

Spine is a planning and organization tool for authors and publishers. Every figure it reports is computed to a published formula from the rates, measurements and figures YOU enter, and the rates are editable because retailers and printers change them without notice. Confirm the current rate card, page-count rules and file specification with your retailer or printer before you upload, and order a proof. Nothing here is a guarantee of acceptance, visibility, sales or income, and none of it is business, tax or legal advice. You are solely responsible for your own publishing decisions.