Generate pixel-perfect, byte-identical PDFs every single time. Built for AI agents, automated systems, and teams that can't afford inconsistent documents.
Trusted by engineering teams at
Built from the ground up for consistency, traceability, and developer experience.
Same input, same output. Every time. Our deterministic engine guarantees reproducible PDFs for testing, compliance, and verification.
Lock template versions with cryptographic hashes. Regenerate historical documents exactly as they were, years later.
Every template and document has a SHA-256 hash. Detect changes, verify integrity, and maintain audit trails automatically.
Validate data before spending resources. Get detailed warnings about missing fields, type mismatches, and formatting issues.
Powerful templating with variables, loops, conditionals, and 20+ built-in formatters. No learning curve for HTML/CSS developers.
Designed for autonomous systems. Clear errors, predictable behavior, and comprehensive validation for AI-driven workflows.
Prepare any PDF for professional print production. Resize, add bleed, convert colors, and validate print-readiness via API.
Resize PDFs to any standard paper size (A4, A5, Letter, etc.) or custom dimensions. Content scales perfectly with fill or fit modes.
Automatically add print bleed by intelligently mirroring edge content. No manual artwork extension needed - works on any PDF.
Convert RGB to CMYK, grayscale, or spot colors. Full ICC profile support for accurate color reproduction on press.
Add crop marks, registration marks, and color bars. Set precise TrimBox, BleedBox, and MediaBox for professional print specs.
Check resolution, color space, fonts, transparency, and page geometry. Get detailed reports on print-readiness issues.
Add die-cut lines as spot colors for stickers, labels, and custom shapes. Create from vectors, text, or geometric shapes.
Integrate in minutes, not days. Our REST API is designed for developers who value simplicity and reliability.
// Generate a PDF with one API call const response = await fetch('https://api.pdfmodule.com/v1/render', { method: 'POST', headers: { 'Authorization': `Bearer ${apiKey}`, 'Content-Type': 'application/json' }, body: JSON.stringify({ template: 'invoice', version: 3, data: { invoice_number: 'INV-2024-001', customer: 'Acme Corp', items: [ { name: 'Widget Pro', qty: 10, price: 29.99 } ] } }) }); const { uuid, url, output_hash } = await response.json(); // output_hash: "sha256:a1b2c3..." - same input = same hash
Get started in minutes with our straightforward workflow.
Create your PDF template with HTML and CSS. Add dynamic slots for your data.
Lock the template to create an immutable version with a unique content hash.
Send your data via REST API. We validate, render, and return your PDF instantly.
Get your deterministic PDF. Same input always produces the exact same output.
Start free, upgrade when you're ready. No hidden fees, no surprises.
Perfect for testing and development
For production applications
For regulated industries
For large organizations
See what engineering teams are saying about PDFModule.
"Finally, a PDF API that actually works consistently. We migrated from three different solutions and PDFModule is the first one where the output is truly deterministic."
"We use PDFModule to generate 50K+ invoices monthly. The version locking feature is a game-changer for compliance. Support team is incredibly responsive."
"Our AI agent generates contracts autonomously. PDFModule's validation API catches errors before they become problems. Essential for our automated workflow."
Start for free. No credit card required. Upgrade when you're ready.