Sign Prep

Make it signable.

Auto-detect fields. Export fillable PDF.

Drop your PDF here

or tap to browse

No upload
Works offline
Your contract stays on your device

Need to prepare documents in bulk? The offline bundle handles batch field detection. $99 once.

Get Bundle →
// How it works

Three steps. Zero uploads.

01
Drop
Drag your PDF onto the page. It stays on your device.
02
Detect
Auto-detects where signature, date, name, and initial fields belong.
03
Export
Download a fillable PDF with proper form fields. Open in any PDF reader.
// Why this is different

Your document never leaves your machine.

Most e-signature tools require uploading your document. Sign Prep detects fields and creates fillable forms entirely on your device.

fwip works differently. The detection engine runs entirely in your browser. Your PDF is read from your device, processed on your CPU, and the result is saved back to your device. No server is involved. We literally cannot see your file.

No server processing

Everything runs on your device using WebAssembly. Your file never touches a network.

No account required

Drop a file. Get a result. No sign-up, no email, no password.

No subscription

Free in the browser. $99 once for the offline bundle. That's it. Forever.

Works offline

The desktop version works with no internet connection at all.

// Questions

Frequently asked.

What fields can it detect?▾
Signature lines, date fields, name fields, and initials markers. It looks for common patterns like "Signature: ___" and "Date: ___" in the text.
What if it misses a field?▾
Use the toolbar to manually add any field type. You can also drag to reposition and resize any detected or manual field.
Does the output work in Adobe Reader?▾
Yes. The exported PDF uses standard AcroForm fields that work in Adobe Reader, Preview, Chrome, and any other PDF reader.
Can I sign the exported PDF?▾
Yes. Open it in Smart Sign (fwip's signing tool) or any PDF reader with form filling support.
// Related tools

You might also need.

PDF
Sign PDF
Draw your signature, place it anywhere.
 PDF
Form Builder
Create fillable PDF forms with real form fields.
 PDF
Flatten PDF
Rasterize form fields into a permanent PDF.
Guide: How to sign a PDF without printing →

Like it? Own it.

Offline. No browser. No internet. No excuses.
$15
This tool
  • Sign Prep · offline
  • Batch processing
  • No file size limit
  • 3 devices · one payment
Join waitlist →
$49
PDF bundle
  • All pdf tools · offline
  • Batch processing
  • No file size limit
  • 3 devices · one payment
Get PDF bundle →
$99
Complete suite
  • All 200+ tools · offline
  • No file size limit
  • No daily use limit
  • 3 devices · one payment · updates included
Join waitlist →
One-time payment · 3 devices · Updates included · Mac + Windows + Linux