Your cursor hovers over the PDF, signature box wobbling like a drunk on ice.
Extract PDF coordinates for signature placement in C#—that’s the holy grail nobody talks about, but every .NET dev building contract tools sweats over it. iText7? Great library. Coordinate system? A sadistic joke. Bottom-left origin, Y flipping upward—it’s like they designed it to troll you. Eyeball a rectangle? Redeploy. Miss by a pixel? Rinse, repeat. Brutal.
And here’s the kicker: most folks cave. Upload to some shady online extractor, pray it doesn’t hoard your NDAs. Risky. Dumb. Unnecessary.
Enter DocCoords. A browser app that loads your PDF locally—yes, locally—lets you draw boxes where signatures go, spits out JSON with llx, lly, urx, ury in perfect iText7 format. No servers. No accounts. Free.
I ran into this problem while building a digital contracts platform at work. I couldn’t find a tool that was: - Visual and precise - Client-side only (no file uploads) - Outputting the exact coordinate format iText7 expects
So I built DocCoords.
That’s the creator’s origin story. Refreshing—no VC fluff, just a dev solving his own pain.
Why iText7’s Coordinate System Feels Like Punishment
Look. PDFs ain’t screens. Points are 1/72 inch, pages rotate, crops bite. iText7 demands Rectangle(llx, lly, width, height)—but lly at the bottom? Visually, that’s the top half. Guess wrong, your sig floats in no-man’s-land.
I’ve seen teams burn days on this. Print the PDF. Ruler out. Measure in millimeters. Convert to points. Math errors pile up. Or debug loops dumping every element’s bbox—code bloat for one field.
DocCoords? Drag, drop PDF. Canvas renders page-for-page. Lasso your spot. Boom—coordinates. Scaled right, PDF units exact.
But wait—unique twist nobody mentions. This echoes the PDF dark ages, circa 2003. Back then, Acrobat plugins ruled; you’d script JS nightmares for form fields. DocCoords? Modern laser surgery compared to that butcher shop. Prediction: in two years, every SaaS contract signer bundles this logic. Open-source it, watch it explode.
Is DocCoords Actually Better Than Your Hacky Scripts?
Short answer: yes. Long answer—let’s code it.
Grab those coords:
float llx = 50f;
float lly = 716f;
float urx = 166f;
float ury = 762f;
float width = urx - llx;
float height = ury - lly;
Then:
using var pdfDoc = new PdfDocument(new PdfReader("input.pdf"), new PdfWriter("output.pdf"));
var acroForm = PdfAcroForm.GetAcroForm(pdfDoc, true);
var signatureField = PdfFormField.CreateSignature(pdfDoc, new Rectangle(llx, lly, width, height));
signatureField.SetFieldName("client_signature");
acroForm.AddField(signatureField);
First try. No “deploy, PDF, curse, repeat.”
Skeptical? It’s canvas-based, client-side JS. PDF.js renders—no quality loss. Draw pixel-perfect, export snaps to PDF points (divide by scale factor—tool handles it). Multi-page? Per-page arrays. JSON nests clean.
Corporate hype check: none here. Creator’s a .NET dev, not a startup. Site’s barebones—doccoords.com. Loads fast, works offline-ish (after PDF.js fetch). Drawback? Browser memory for huge PDFs. Fair. But for contracts? Gold.
Why Risk Uploading Legal Docs to Random Tools?
NDAs. Contracts. Invoices with SSNs. You know the drill—upload, extract, delete prayer. But breaches happen. Tools log. Cookies track. Why gamble?
DocCoords processes in-browser. WebAssembly? Nah, pure JS. Your PDF bytes stay tab-bound. Export, close, gone.
Tested it. Loaded a 50-page contract. Drew five sig boxes across pages. JSON out in seconds. Pasted to iText7 repro. Perfect overlay. Dry humor: feels like cheating.
Deeper critique—iText’s docs gloss this pain. Tutorials assume you know coords. Reality? Devs hack wrappers, charge premiums. DocCoords democratizes it. Bold call: Adobe should buy this vibe, fix their ecosystem.
Wander a sec—remember IronPDF or PdfSharp? Alternatives exist, but iText7’s open-ish, battle-tested. Sticking with it? Tool like this shines.
How Does This Change Your Workflow Forever?
Morning: PDF in. Boxes drawn. JSON copied. C# snippet swapped. Build. Test. Done.
No more visualizers needing installs. No Photoshop traces. Teams sync coords in Git—JSON commits, anyone?
For platforms—embed the widget. API it later. Scalable.
Humor break: if you’ve ever measured a printed PDF with a ruler, you’re my people. This erases that shame.
Prediction holds: contract automation in .NET hits escape velocity with helpers like this. iText7 users, rejoice—or at least stop swearing.
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Frequently Asked Questions
What is DocCoords and how does it work?
Browser tool for drawing signature boxes on PDFs, exporting iText7-ready coordinates as JSON—all client-side.
How do I extract PDF coordinates for iText7 in C#?
Load PDF in DocCoords, draw rectangle, copy llx/lly/urx/ury to your Rectangle constructor. Paste, build, sign.
Is DocCoords safe for sensitive legal documents?
Yes—processes locally in your browser. No uploads, no servers touch your files.
