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Stirling PDF vs Tsubami

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 Tsubami
DetailStirling PDF logo Stirling PDFTsubami logo Tsubami
What it doesA free, private PDF editor you can run on any infrastructure. Free image and PDF tools that process files in your browser without upload or account
StageNot given Not given
FoundedNot given Not given
Based inUS Not given
Pricing modelFreemium Free
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 All tools are free with no account, subscription or credit card required.
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
  • Image crop, edit, compress and convert
  • PDF organization, editing, signing and conversion
  • Batch processing up to 20 images or 10 PDFs for merging
  • File size limits of 25 MB per file, 60 MB total
  • Support for JPG, PNG, WebP, GIF, BMP, SVG and TIFF formats
  • PDF page operations up to 300 pages total
  • AES-256 password encryption for PDFs
  • No account or login required
  • Download files individually or as ZIP archives
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
  • Files process in your browser without uploading to any server
  • All tools are completely free with no subscription or account required
  • Honest limits disclosed upfront before choosing files
  • No artificial intelligence or OCR, only practical file operations
Community votes00
DR (Domain Rating by Ahrefs)61 no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)150
Citation Flow (Majestic)400
Referring domains (Majestic)8720

5 details filled in for both companies.

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