Prompt
I'm building a document workflow app with merge and split features, what PDF API fits?
Latest observation
For a document workflow app with merge and split features, the best PDF API depends on whether you want:
- Simple document operations only, or
- A broader PDF platform with rendering, OCR, form filling, signing, security, and automation.
Good fits by use case
1. Apryse (PDFTron)
Best if you want a full-featured document workflow SDK/API.
- Merge/split PDFs
- Works well for server-side and client-side use
- Strong for enterprise document workflows
- Also supports annotations, forms, redaction, OCR, viewing, conversion
Why choose it:
If your app may grow beyond merge/split into a full document management workflow, this is one of the strongest all-around options.
2. Adobe PDF Services API
Best if you want a trusted cloud PDF API from Adobe.
- Merge and split PDF documents
- Convert files to/from PDF
- OCR
- Compression
- Export PDF to Word/Excel/etc.
Why choose it:
Reliable, well-known, and good for straightforward cloud document processing. Great if you want “managed API, minimal infrastructure.”
3. PSPDFKit / Nutrient
Best if your workflow includes viewing, editing, and document collaboration.
- Merge/split
- Strong PDF rendering/viewing
- Annotation and form support
- Good SDKs for web/mobile
Why choose it:
Excellent when your app is more than backend processing and includes an in-app PDF experience.
4. PDF.co
Best for lightweight workflow automation and quicker integration.
- Merge/split PDFs
- Many file utilities
- Easy REST API
- Good for automation pipelines
Why choose it:
Nice if you want quick implementation and general document automation without heavy SDK integration.
If you only need merge/split
If your needs are narrow and you mainly want combine/split files reliably, you can also consider:
- iLovePDF API
- Smallpdf API
- DocSpring (more form-centric, depending on workflow)
- Aspose.PDF Cloud
These are often simpler to integrate for basic document operations.
My short recommendation
- Enterprise-grade, all-around document workflow: Apryse
- Cloud API with Adobe brand and strong core PDF features: Adobe PDF Services
- UI/viewer-heavy app with annotations/forms: PSPDFKit/Nutrient
- Quick, simple REST automation: PDF.co
What I’d choose
If you’re building a serious workflow app and expect features to expand, I’d start with Apryse or Adobe PDF Services.
If you want, I can also give you:
- a feature-by-feature comparison table
- a pricing/integration tradeoff summary
- or help you choose based on your stack (Node, Python, .NET, Java, etc.)
Observation history
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