Almost everyone handles PDFs, yet most people pay for features they could get free, or fight a clunky tool for a job that takes ten seconds elsewhere. We spent a week running the same real tasks — merging a 40-page report, compressing a scanned contract, redacting a payslip — across the popular options. Here is what actually earned a place in our workflow.
Merging and splitting PDFs
For quick, occasional merging or splitting, the free browser tools are genuinely all you need. PDF24 Tools (free, German-made, no watermark) handled a 12-file merge in seconds and processes locally where possible. Smallpdf is slicker but caps free users at two tasks per day. If you never want a file to leave your machine, the open-source desktop app PDFsam Basic (free) does merge, split and rotate offline — our pick for anyone handling sensitive documents.
Compressing without wrecking quality
Scanned PDFs balloon fast. In our test, a 24 MB scanned contract dropped to 3.1 MB through Adobe Acrobat’s compression with text still crisp, versus 4.4 MB and slightly softer images from a free web tool. For most email-attachment purposes the free result is fine; for anything going to print, Acrobat’s control over image downsampling wins.
OCR: making scans searchable
OCR (optical character recognition) turns a scanned image into selectable, searchable text — the difference between a dead scan and a usable document. Acrobat Pro’s built-in OCR was the most accurate on a faint fax in our test. Free alternatives exist: Google Drive will OCR a PDF for free if you open it as a Google Doc, and the open-source OCRmyPDF is excellent if you are comfortable with a command line.
Free vs paid: what you are really paying for
| Tool | Price (2026) | Best for |
|---|---|---|
| PDF24 Tools | Free | Merge, split, convert, light editing |
| PDFsam Basic | Free (open-source) | Offline merge/split of sensitive files |
| Smallpdf | ~$9/mo (free: 2 tasks/day) | Polished all-rounder, occasional use |
| Adobe Acrobat Pro | ~$20/mo | Editing, accurate OCR, redaction, e-sign |
The features worth paying for
After the week, our honest take: casual users should not pay a cent — PDF24 plus Google Drive OCR covers merging, splitting, compressing and searchable scans. Pay for Acrobat only if you regularly edit text inside PDFs, need true redaction (that removes data, not just hides it), or send documents for legally binding e-signatures. Those three jobs are where the free tools genuinely fall short, and where a mistake actually matters.
Frequently asked questions
What is the best free PDF tool?
For everyday merging, splitting and compressing, PDF24 Tools is our free pick with no watermark. For offline work on sensitive files, PDFsam Basic is excellent.
How do I make a scanned PDF searchable?
Run OCR on it. Adobe Acrobat Pro is the most accurate, but Google Drive will OCR a PDF for free if you open it as a Google Doc.
Is it safe to use online PDF tools?
For non-sensitive files, reputable tools are fine. For confidential documents, use an offline tool like PDFsam so the file never leaves your computer.
Do I need to pay for Adobe Acrobat?
Only if you regularly edit text inside PDFs, need true redaction, or require legally binding e-signatures. Free tools handle everything else.