LintPDF LoupePDF

Features

Everything LoupePDF does

The complete capability list — from per-channel separations to plugin slots to the i18n hook. If something on this page would make your prepress workflow click, it's already in the box.

See every pixel

A viewer that respects the artwork

Pin-sharp rendering on every device, with the controls reviewers actually reach for.

  • Pin-sharp PDF viewing on desktop, tablet, and phone.

  • Smooth zoom from 25% to 400%, pinch-zoom on touch, native scroll-and-pan.

  • Page thumbnails with at-a-glance issue counts so reviewers go straight to what matters.

Print-ready inspection

Press-floor accuracy in the browser

Every separation, every layer, every box — interactive and instant.

  • True ink separations — toggle Cyan, Magenta, Yellow, Black, and every spot ink one click at a time.

  • Layer (OCG) toggling that responds instantly — no waiting on the server between clicks.

  • Trim, bleed, and crop boxes overlaid on the page with sizes in millimetres and inches.

  • Dieline detection callouts per artwork region.

Professional measurement

The toolset on a real loupe

Measure, sample, and verify without leaving the viewer.

  • Ruler: drag to measure in mm, in, points, picas, or agate simultaneously.

  • Color picker: click anywhere to read RGB, hex, and Total Area Coverage.

  • Densitometer: real CMYK + spot percentages plus TAC at any point, with over-limit warnings.

  • TAC heatmap: see every spot on the page that exceeds your ink coverage limit at a glance.

Collaborative review

Mark up the proof, not a screenshot

Annotation tools and review flows that survive a flaky connection.

  • Draw on the proof: pen, arrow, rectangle, ellipse, text, highlight.

  • Per-page autosave so a flaky connection never costs a comment.

  • Sidebar thread of every annotation across every page, with one-tap jump-to-page.

  • Read-only share links for clients — review without the risk of accidental edits.

Works with what you have

Drop in, scale up

Useful out of the box; deeper when you wire it up.

  • Drop in a PDF and it just works — no backend required for basic viewing, layers, measurements, and color picking.

  • Plug in your own services for deeper inspection, or deploy our optional Ghostscript-powered backend for preflight-grade separations and TAC.

  • Tools you haven't wired simply don't appear — no clutter, no dead buttons.

Built for your brand

Looks like yours, not ours

Themeable surfaces, accessible defaults, native on every form factor.

  • Your logo, your colors, your domain — every surface themeable.

  • Light and dark modes out of the box.

  • Mobile-first chrome that feels native on a phone, not a shrunken desktop site.

  • Accessible defaults; keyboard navigation throughout.

Extensible by design

Composable from day one

Slot architecture, shadow replacements, and a generic overlay shape.

  • Plugin slots for overlays, panels, toolbars, dialogs, and custom annotation sources.

  • Drop-in replacements: ship a third-party panel that quietly shadows the built-in one with no fork required.

  • Generic data shape — convert your findings, brand-spec violations, or QA notes into overlay items the viewer renders identically.

Enterprise-ready

Self-host without surprises

Stateless, cacheable, observable on your terms, AGPL-3.0 throughout.

  • Stateless reference backend; deploy as many copies as you need.

  • Cloudflare-friendly out of the box — every rendered tile is immutable and tagged for one-click cache purges.

  • No telemetry, no phone-home — bring your own analytics hook.

  • Internationalisation hook for any language your team needs.

  • Open source under AGPL-3.0; full source, no black boxes.

Developer love

A codebase you'd want to own

Modern stack, real docs, a clean integration path.

  • Modern React 19, ESM-only, fully typed.

  • Sub-path imports so your bundle pulls only what you mount.

  • Live demo and a complete reference backend in the repo — clone it, run it, and you're inspecting PDFs in two commands.

  • Comprehensive docs, real changelog, security disclosure process, and a code of conduct.

Ready to embed it?

The docs walk through wiring ViewerServices, mounting components, and shipping your first plugin.

Read the docs View on GitHub