Smallpdf vs Merge PDF
Updated 01 Apr 2026
Kordu Tools
Merge PDF
Combine multiple PDF files into one document — drag, reorder, and merge with no upload and no watermark.
Competitor
Smallpdf
Web-based PDF toolkit offering merge, split, compress, convert, and edit tools. Free tier is limited to 2 tasks per day.
Competitor info last verified 01 Apr 2026 from public pricing pages and official documentation.
Smallpdf is one of the most complete online PDF toolkits available, with over 20 tools covering everything from basic merging to OCR, eSignature, and AI-powered document chat. It's a polished product that handles the full PDF workflow for individuals and teams.
The catch is the free tier: 2 tasks per day, with a 5 MB file size cap. That's enough for light occasional use, but anyone who regularly works with PDFs will hit the limit quickly and need to pay $9–$12/month.
Kordu's Merge PDF does exactly what its name says — merges PDFs in your browser, with no task limits, no upload, and no cost. It's the right tool if you need reliable merging without restrictions. If you need a full PDF suite (editing, signing, OCR, converting), Smallpdf's paid plan is hard to beat.
Feature comparison
| Feature | Merge PDF | Smallpdf |
|---|---|---|
| Privacy — files stay on your device | Yes — PDFs are merged in your browser using PDF-lib. Nothing is uploaded. | No — files are uploaded to Smallpdf's servers for processing and deleted after. |
| Account required | Never. | Not required for basic tools; required for AI features and cloud storage. |
| Daily task limit (free) | No limit — merge as many PDFs as you want, for free. | 2 tasks per day on the free tier. |
| Max file size (free) | Up to 100 MB total per merge. | 5 MB per file on the free tier. |
| Number of files per merge | Unlimited — drag in as many PDFs as needed. | Multiple files supported, within the 5 MB limit per file. |
| Breadth of PDF tools | Merge, split, compress, convert (PDF to/from DOCX, PPTX, JPG, and more). | 20+ tools: merge, split, compress, convert, edit, annotate, OCR, eSign, AI assistant. |
| eSign and form filling | Not available. | Yes — fill forms, sign documents, send for eSignature. |
| Cost for unlimited use | Free forever. | ~$9/month (annual) or $12/month (monthly) for Pro. |
Privacy — files stay on your device
Merge PDF
Yes — PDFs are merged in your browser using PDF-lib. Nothing is uploaded.
Smallpdf
No — files are uploaded to Smallpdf's servers for processing and deleted after.
Account required
Merge PDF
Never.
Smallpdf
Not required for basic tools; required for AI features and cloud storage.
Daily task limit (free)
Merge PDF
No limit — merge as many PDFs as you want, for free.
Smallpdf
2 tasks per day on the free tier.
Max file size (free)
Merge PDF
Up to 100 MB total per merge.
Smallpdf
5 MB per file on the free tier.
Number of files per merge
Merge PDF
Unlimited — drag in as many PDFs as needed.
Smallpdf
Multiple files supported, within the 5 MB limit per file.
Breadth of PDF tools
Merge PDF
Merge, split, compress, convert (PDF to/from DOCX, PPTX, JPG, and more).
Smallpdf
20+ tools: merge, split, compress, convert, edit, annotate, OCR, eSign, AI assistant.
eSign and form filling
Merge PDF
Not available.
Smallpdf
Yes — fill forms, sign documents, send for eSignature.
Cost for unlimited use
Merge PDF
Free forever.
Smallpdf
~$9/month (annual) or $12/month (monthly) for Pro.
Pros & cons
Merge PDF
Pros
- No daily task limits — merge unlimited PDFs for free
- Complete privacy — processing happens in your browser, nothing uploaded
- Supports larger files on the free tier (up to 100 MB total)
- No account required
Cons
- Focused only on PDF merge — no editing, signing, or OCR
- No AI document features
Smallpdf
Pros
- Comprehensive PDF toolkit: 20+ tools in one place
- eSign, form filling, and document workflows
- OCR for scanned documents
- AI features: chat with PDF, summarize, translate
Cons
- Free tier capped at 2 tasks/day
- 5 MB file size limit on free tier
- Files uploaded to Smallpdf servers
- Full tool access requires Pro subscription ($9–$12/month)
When to use which
You need to merge PDFs occasionally, for free
Merge PDFKordu has no daily limits and a higher file size cap on the free tier. Smallpdf's free tier is limited to 2 tasks per day.
You're merging confidential documents (legal, medical, financial)
Merge PDFKordu merges PDFs entirely in your browser. Smallpdf uploads files to their servers, even though they delete them after processing.
You need a complete PDF suite — editing, signing, OCR, converting
SmallpdfSmallpdf's Pro plan covers 20+ tools including eSign, OCR, and AI document features. Kordu currently focuses on PDF merging and conversion.
You regularly merge large PDFs (over 5 MB)
Merge PDFKordu supports up to 100 MB total per merge. Smallpdf's free tier caps at 5 MB per file.
You need to send documents for eSignature
SmallpdfSmallpdf has built-in eSign and form-filling tools. Kordu does not offer document signing.
Our verdict
Bottom line
For PDF merging specifically, Kordu is the better choice: no daily limits, larger file support on the free tier, and full in-browser privacy. Smallpdf earns its place if you need the full PDF toolkit — editing, signing, OCR, format conversion — and are willing to pay for a Pro plan.
Try Merge PDF free