The free PDF tool landscape splits into two camps: server-upload platforms that process your files on their computers, and browser-based tools that process on yours.
This guide compares the major options across every common PDF task — so you can pick the right tool for each job.
Platforms Compared
| Platform | Type | Merge | Split | Compress | Convert | Encrypt | Unlock |
|----------|------|-------|-------|----------|---------|---------|--------|
| BrowserStay | Browser-local | Yes | Yes | Via images* | PDF↔Image, PDF→Markdown | Yes | Yes |
| iLovePDF | Server upload | Yes | Yes | Yes | Yes | Yes | Yes |
| Smallpdf | Server upload | Yes | Yes | Yes | Yes | Yes | Yes |
| Adobe Acrobat Online | Server upload | Yes | Yes | Yes | Yes | Yes | Limited |
| PDF24 | Server upload | Yes | Yes | Yes | Yes | Yes | Yes |
| Sejda | Server upload | Yes | Yes | Yes | Yes | Yes | Yes |
| PDFsam | Desktop | Yes | Yes | No | Limited | No | No |
*BrowserStay compresses image-heavy PDFs via PDF→image→compress→PDF workflow.
Privacy Comparison
This is the biggest differentiator most comparison articles ignore.
| Platform | Files uploaded? | Account required? |
|----------|-----------------|-------------------|
| BrowserStay | Never | No |
| iLovePDF | Yes | Optional |
| Smallpdf | Yes | Optional |
| Adobe | Yes | Yes |
| PDF24 | Yes | No |
| Sejda | Yes | No |
| PDFsam | Never (desktop) | No |
What "uploaded" means: Your file travels over the internet to their server. They process it, store it temporarily (they claim), and send back the result. You trust their privacy policy.
What "browser-local" means: Software loads into your browser. Files stay in memory on your device. The server never receives your document.
Free Tier Limits
"Free" doesn't mean unlimited on server-upload platforms.
| Platform | Notable free limits |
|----------|---------------------|
| BrowserStay | None (device memory is the practical limit) |
| iLovePDF | Limited tasks per day |
| Smallpdf | 2 tasks per day |
| Adobe | Limited features; account required |
| PDF24 | Generous; occasional ads |
| Sejda | 3 tasks/hour; 200 pages; 50MB files |
| PDFsam Basic | Unlimited merge/split; advanced features paid |
If you process PDFs daily, server-upload limits get frustrating fast.
Watermarks
| Platform | Watermarks on free output? |
|----------|---------------------------|
| BrowserStay | Never |
| iLovePDF | Some tools (not merge/split) |
| Smallpdf | Some tools on free tier |
| Adobe | Varies by feature |
| PDF24 | Generally no |
| Sejda | No on most tools |
Always test with a non-critical file before processing something important.
Feature Depth
Server-upload platforms win on breadth:
- OCR (scan to searchable text)
- E-signatures and form filling
- PDF editing (add text, images, annotations)
- Cloud storage integration
- Team collaboration
Browser-local tools win on privacy and simplicity:
- Core tasks without upload
- No account friction
- Verifiable local processing
- No artificial daily limits
When to Use Each
Use iLovePDF, Smallpdf, or Adobe when:
- You need OCR, e-sign, or advanced editing
- The document is public or non-sensitive
- You're OK with upload and account requirements
- You need mobile apps with full feature sets
Use PDF24 or Sejda when:
- You want generous free server processing
- The file isn't confidential
- You need a quick one-off task without installing software
Use BrowserStay when:
- The document is sensitive (financial, legal, medical, personal)
- You want no upload, no account, no limits
- You need merge, split, encrypt, unlock, or PDF↔image conversion
- You want privacy you can verify in the Network tab
Use PDFsam or Mac Preview when:
- You want fully offline desktop processing
- You merge/split frequently
- You don't mind installing software
The Honest Summary
There's no single "best" PDF tool — it depends on what you're processing.
For public files where convenience matters most, server-upload platforms like iLovePDF and PDF24 are fine.
For private files where you can't risk a third party seeing the content, the architecture matters more than the feature list. BrowserStay and desktop tools like PDFsam are the right choice.
For power users who need OCR, e-sign, and editing, Adobe or iLovePDF's paid tiers are worth the subscription — accepting the upload tradeoff.
Try It Yourself
BrowserStay covers merge, split, encrypt, unlock, PDF to image, and image to PDF — all in your browser, all free, no uploads. Explore PDF tools or start with Merge PDF or Split PDF.
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