codex-pdf
BetaStructured PDF extraction API that turns complex files into consistent JSON.
CMYK + spot separations · TAC heatmap · Densitometer · Layer toggles · Annotation overlays
See Every Ink,
Every Plate.
Embeddable web PDF viewer purpose-built for prepress review. Inks, plates, dielines, varnish — every layer the press operator needs, inspectable in any browser.
The viewer prepress actually deserves
LensPDF surfaces ink separations, TAC, layers, and annotation overlays — the things a prepress operator actually needs when looking at a job. Embeddable, AGPL-3.0-licensed, no vendor lock-in.
Per-Channel Separations
Toggle process (CMYK) and spot channels per page. Isolate single inks, inspect overprint behavior, verify plate counts — all in the browser.
TAC Heatmap
Total-area-coverage overlay flags ink-limit violations per pixel. Click any spot to read the densitometer across every separation.
Densitometer Probe
Single-pixel color probe across every channel. Read CMYK, spot, and TAC at any point — with over-limit warnings when a region exceeds your ink coverage.
Layer Toggles
PDF optional-content groups render as toggleable layers. Dieline, white ink, varnish, and braille each get their own visibility switch — no server round-trip per click.
Pin-Sharp Viewing
Smooth zoom from 25% to 400% on desktop, pinch-zoom on touch, page thumbnails with at-a-glance issue counts. Works equally well on a 32-inch monitor and a phone.
Measurement Toolkit
Ruler that reads in mm, inches, points, picas, and agate at once. Trim, bleed, and crop boxes overlaid on the page with sizes you can read without doing math.
Annotation Toolkit
Pen, arrow, rectangle, ellipse, text, and highlight tools. Per-page autosave, sidebar thread of every comment across every page, read-only share links for clients.
Plugin Slots
Custom toolbars, panels, hotkeys, dialogs, and overlay layers. Drop-in shadow replacements let third-party panels override built-ins with no fork.
Brand & Theme
Theme tokens for every surface, light and dark out of the box, mobile-first chrome, accessibility and keyboard navigation throughout. Your logo, your colors, your domain.
Embeddable
Drop the viewer into any React, Astro, Next.js, or vanilla host. Tools you haven't wired simply don't appear — no clutter, no dead buttons.
Annotation Overlays
Render any preflight findings — engine, PitStop, callas, Acrobat — directly on the page. Filter by severity, jump to location, hover for context.
Edge-Cached
Stateless reference backend, immutable page tiles tagged for one-click Cloudflare cache purges. No telemetry, no phone-home — bring your own analytics.
Open source
One family. Five repos. Pick the pieces you need.
The print-prepress stack split into focused, replaceable components — facts extraction, preflight engine, embeddable viewer, metadata assay, and a deterministic writer. Use one, use all five, or vendor only the parts that fit your pipeline.
lens-pdf
BetaEmbeddable PDF viewer with separations, TAC, layers, and annotation overlays.
lint-pdf
BetaDetection-only PDF preflight engine — 500+ checks plus the PDF/X-4 conformance suite.
assay-pdf
BetaPDF assay and metadata reporting — surface what's actually inside the file.
compile-pdf
BetaDeterministic PDF writer — rewrite, marks, imposition, and trapping with verifiable lineage.