Head-to-head · PDF Editors
UPDF vs Stirling PDF
UPDF leads on 1 check, Stirling PDF on 0, and 5 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.
Our verdict
- Highest scoreUPDF · 7.6/10
- Free planboth
- Most featuresUPDF · 5 of 5
UPDF scores higher on our rubric for pdf editors: 7.6 against 7.2 out of 10; our editors rank them #19 and #22.
UPDF offers form creation; Stirling PDF doesn't.
UPDF is the better fit for modern AI-assisted PDF editing. Stirling PDF is the better fit for self-hosted PDF automation and privacy.
- UPDF fits best
Modern AI-assisted PDF editing
- Stirling PDF fits best
Self-hosted PDF automation and privacy
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Side by side
| Feature | UPDF 7.6/10 Visit ↗ | Stirling PDF 7.2/10 Visit ↗ |
|---|---|---|
| At a glance | ||
| Editor score | 7.6 | 7.2 |
| Ranking | #19 in PDF Editors | #22 in PDF Editors |
| Best for | Modern AI-assisted PDF editing | Self-hosted PDF automation and privacy |
| Pricing model | Free plan + paid | Free plan + paid |
| Starting price | — | $99/mo |
| Free plan | ✓ | ✓ |
| Free trial | — | — |
| Deployment | Cloud, Desktop, Mobile | Cloud, Self-hosted, Desktop |
| Platforms | Web, Windows, macOS, iOS, Android | Web, Windows, macOS, Linux |
| Support | Email, Community, Docs | Email, Community, Docs |
| Integrations | 5 integrations | 16 integrations |
| Built for | Solo, Small business, Mid-market, Enterprise | Solo, Small business, Mid-market, Enterprise |
| Features UPDF 5/5 · Stirling PDF 4/5 | ||
| Text editing | ✓ | ✓ |
| Annotation tools | ✓ | ✓ |
| OCR | ✓ | ✓ |
| PDF conversion | ✓ | ✓ |
| Form creation | ✓ (best) | — |
| Specs | ||
| Supported platforms | Windows, macOS, iOS, Android | web, Windows, macOS, Linux, API, self-hosted |
| Our review | ||
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| Our verdict | UPDF is a PDF editor and reader for individuals, businesses, and educational users. It covers document editing, annotation, page organization, conversion, OCR, forms, passwords, redaction, and electronic signing. Its scope extends beyond… Read the review → |
Stirling PDF is an open-source PDF platform for individuals, teams, and organizations that need editing, annotation, OCR, conversion, signing, redaction, compression, and page-management tools. It runs in a browser, on Windows, macOS, and… Read the review → |
Strengths and trade-offs
UPDF — where it wins
- Edits PDF text, images, links, pages, and forms
- Combines OCR, conversion, redaction, and annotation tools
- Adds AI summarization, translation, and PDF chat
Where it doesn't
- Free saved documents include trial watermarks
- Free plan allows up to two conversions per day
- AI tools may not suit users seeking a focused PDF editor
Stirling PDF — where it wins
- Self-hosted, desktop, web, API, and pipeline options
- OCR, redaction, signing, conversion, and 60+ PDF tools
- Open-source with integrations across storage and work platforms
Where it doesn't
- Does not create new PDF form fields
- Team costs $99 per month
- Broad functionality may exceed simple editing needs
- UPDF7.6/10 · Free plan
A broad PDF toolkit with OCR, forms, conversion, and AI document tools.
Visit UPDFFull verdict → - Stirling PDF7.2/10 · Free plan
A broad PDF toolkit for privacy-focused automation, with limited form creation.
Visit Stirling PDFFull verdict →
All PDF editors comparisons → · Full ranking →
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update