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Stirling PDF vs TweakPDF

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

Stirling PDF compared with TweakPDF
DetailStirling PDF logo Stirling PDFTweakPDF logo TweakPDF
What it doesA free, private PDF editor you can run on any infrastructure. Edit text in PDF online, in the same font
StageNot given Not given
FoundedNot given Not given
Based inUS PL
Pricing modelFreemium Freemium
PricingFree: $0/month includes 60+ PDF tools, web/desktop/self-hosted access, open-source editor, and 1,000 monthly credits. Team: $99/month for 100 users, includes everything in Free plus single sign-on, team workspace, and central control. Enterprise: Custom pricing for regulated and air-gapped deploymen Free: 3 files a month, no card needed. Pro: $6 a month, $24 every 6 months ($4/month), or $36 a year ($3/month) for up to 1,000 files a month. All plans renew automatically and can be cancelled anytime.
Key features
  • PDF reader with lightning-fast reading
  • 60+ PDF editing tools
  • OCR to read scanned pages
  • Classification and tagging
  • Signature validation
  • PDF redaction
  • Compression
  • Routing to multiple destinations
  • API for programmatic access
  • Connectors for tool integration
  • Edit text in document's own font without shifting layout
  • Deleted text is removed from file, not hidden
  • Edit scanned PDFs by patching images
  • Add signatures to PDFs
  • Preview before download
  • Font substitution with warning
  • Edit without account signup
  • Support for up to 100 pages and 25 MB files
What makes it different
  • Completely free editor forever with no per-seat licensing
  • Run on any infrastructure with files staying yours
  • Process thousands of PDFs with AI-powered automation
  • Every action logged and recorded for compliance
  • Deleted, not hidden: replaced text is completely removed from the file, making it truly searchable and editable
  • No layout shift: new text sits on the same baseline in the document's original font
  • Works on scanned PDFs: patches images and draws new text where no text layer exists
  • Sign PDFs with actual ink, not certified digital signatures
Community votes00
DR (Domain Rating by Ahrefs)63 +1 (up) since last checkNot checked yet no change since last check
Trust Flow (Majestic)150
Citation Flow (Majestic)4016
Referring domains (Majestic)8722

6 details filled in for both companies.

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