PDFup vs Stirling PDF

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 Stirling PDF
Detail	PDFup	Stirling PDF
What it does	Free browser-based PDF tools for merging, editing, converting and organizing files without uploads	A free, private PDF editor you can run on any infrastructure.
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	US
Pricing model	Free	Freemium
Pricing	All tools are completely free with no limits on file size, number of files, or usage frequency.	Free: $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
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	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
What makes it different	100% client-side processing with no file uploads to servers Works offline after initial page load	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
Community votes	0	0
DR (Domain Rating by Ahrefs)	4 no change since last check	61 no change since last check
Trust Flow (Majestic)	6	15
Citation Flow (Majestic)	28	40
Referring domains (Majestic)	11	872

5 details filled in for both companies.

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