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PDFup vs PAdES Studio

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

PDFup compared with PAdES Studio
DetailPDFup logo PDFup PAdES Studio
What it doesFree browser-based PDF tools for merging, editing, converting and organizing files without uploads Digital PDF signatures for macOS
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFree Freemium
PricingAll tools are completely free with no limits on file size, number of files, or usage frequency. Create your first 5 signatures free, then unlock unlimited signing with a one-time purchase
Key features
  • Merge multiple PDF files
  • Compress PDF file size
  • Edit and annotate PDFs
  • Convert images to PDF and vice versa
  • Create and fill PDF forms
  • Sign PDFs digitally
  • Organize and rotate pages
  • Compare two PDF versions
  • Keychain signing with support for CryptoTokenKit smart cards
  • Visible signature with optional image, signer name, and signing time
  • RFC 3161 timestamping and long-term validation (LTV)
  • Signature inspection with status, certificate chains, and DSS material review
  • Multiple signatures as independent document revisions
  • Local document processing without server uploads
  • Support for PAdES-B-B, PAdES-B-T, PAdES-B-LT, and PAdES-B-LTA profiles
What makes it different
  • 100% client-side processing with no file uploads to servers
  • Works offline after initial page load
  • Real digital signatures that preserve original PDF bytes, not just image stamps
  • Incremental PDF updates preserve existing signatures as independently verifiable
  • All document processing stays local without server uploads
  • Works with macOS Keychain and supported smart cards without PKCS#11 limitation
  • Verification always unlimited while signing has free tier option
Community votes00
DR (Domain Rating by Ahrefs)4 no change since last check37 no change since last check
Trust Flow (Majestic)67
Citation Flow (Majestic)2816
Referring domains (Majestic)115

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