Help Center

Overview

Choosing a trim (all interior fixers)

Pick the tool that matches the trim size in your printer's interior setup (KDP, IngramSpark, Lulu, Blurb, etc.). The table shows the finished print page dimensions InkAlign outputs (trim + standard 0.125″ bleed on the outside edge and head/foot — the same convention KDP documents for paperback interiors).

If your manuscript was designed for a different trim, switch to that tool before exporting — mixing trim families is the most common cause of unexpected scaling or margin warnings.

How the interior fixer works

1. Choose the trim tool that matches your trim (table above) and upload your interior PDF.
2. Health scan — we surface layout risks (margins, bleed, fonts) before you commit to an export.
3. Preview — review a watermarked preview of how pages land on the target size.
4. Export — after checkout (or your plan rules), you download a print-ready PDF sized to the bleed dimensions for that trim, with gutter and mirror margins applied consistently across the book.

Each tool page lists the same auto-fixes (mirror margins, gutter tiers, font embedding checks, bleed alignment) so behavior matches across trims — only the target page dimensions change.

Bleed & page size (industry / KDP-style)

Other InkAlign tools

• Spine width calculator — white vs cream paper; copy a spine width for your cover wrap.
• Cover validation — upload a KDP wrap PDF; we measure against spine + trim + bleed and offer a blank template at the exact size.
• PDF size & metadata inspector — upload any PDF in your browser to see page dimensions (inches and points), rotation, MediaBox, the document info dictionary, XMP when present, and suggested InkAlign interior trim tools.
• Back matter PDF generator — About the Author, Also By, and a newsletter page with an optional QR code at standard interior bleed sizes; merge onto your interior in the browser when page sizes match. Sign in with an active trial or paid plan to use this tool.
• Journal & planner interior composer — mix dot grid, lined, square grid, habit tracker, recipe log, checklist, and reading log pages into a print-ready PDF for low- or no-content books; built locally in your browser. Sign in with an active trial or paid plan to use this tool. Publishing at volume? See the low-content publisher hub.
• Tools hub — one grid with every interior fixer, the PDF inspector, the back matter generator, the journal composer, and the utilities above.

Publisher REST API

Included with the Publisher subscription. In Dashboard → Settings, create an API key (raw secret begins with ink_). Every request must send:

Authorization: Bearer ink_…

Replace https://YOUR_DOMAIN with your InkAlign site origin (same value you use for NEXT_PUBLIC_BASE_URL).

List interior presets

curl -sS https://YOUR_DOMAIN/api/v1/interior/presets \
  -H "Authorization: Bearer ink_YOUR_SECRET"

Whoami

curl -sS https://YOUR_DOMAIN/api/v1/me \
  -H "Authorization: Bearer ink_YOUR_SECRET"

Interior fix (vector PDF)

POST multipart form with field file (your interior PDF). Optional query trim selects the preset id (default 6x9). Response is application/pdf — vector gutter + trim+bleed layout. The browser app still runs the optional 300 DPI raster flatten pass for maximum print safety; the API returns the vector stage so it can run on the server.

curl -sS -o fixed.pdf \
  -H "Authorization: Bearer ink_YOUR_SECRET" \
  -F "file=@manuscript.pdf" \
  "https://YOUR_DOMAIN/api/v1/interior/fix?trim=6x9"

CORS is enabled with Access-Control-Allow-Origin: * for browser or tooling origins. Typical upload limit on this route is 32 MiB per file (see response headers on errors).

FAQs