Best Free PDF Tools in 2026: Ranked by Privacy, Speed, and Features
Best free PDF tools in 2026: ranked by privacy, speed, and features
Most "best PDF tools" articles list features and move on. They skip the question users ask on Reddit: "Is it safe to upload my documents?"
The answer depends on which tool you use. Most free online PDF tools upload your files to their servers. That file you're editing might sit on a server in another country, processed by software you can't inspect, retained for a duration you can't verify. For a casual file, that's fine. For a tax return or contract, it's a problem.
We tested 9 free PDF tools and ranked them by privacy, speed, and features.
How we tested
We ran each tool through the same tasks: compressing a 15MB PDF, converting a Word document, running OCR on a scanned page, splitting by page range, and merging three files. We timed each operation and noted any limitations on the free tier.
For privacy, we checked whether each tool processes files locally or uploads them to a server. We reviewed data retention policies where available.
For features, we looked at what's actually free. Many tools advertise features that require a subscription after the first use.
The tools
1. PDF24 Creator
PDF24 is a desktop application with over 50 tools built in. Everything runs locally on your computer. No file uploads, no server processing.
The feature set includes compression, conversion, OCR, merge, split, watermarks, and page manipulation. OCR accuracy is solid for printed documents. Compression reduced our test file from 15MB to 4.2MB in about 8 seconds.
The drawbacks: Windows only, and the interface looks dated. But if you're on Windows and want local processing, PDF24 is the best option.
Free limits: None. All features are free. Platforms: Windows Privacy: Local processing only
2. PDFgear
PDFgear is a desktop application that works on Windows, Mac, and iOS. It processes files locally.
The interface is cleaner than PDF24, closer to what you'd expect from paid software. It includes OCR, form filling, annotations, and an AI assistant for summarizing documents.
Compression finished in 6 seconds with good file size reduction. OCR handled a scanned document accurately, though handwriting recognition was inconsistent.
PDFgear includes some online features, but the core editing and conversion tools work offline.
Free limits: None for desktop features Platforms: Windows, Mac, iOS Privacy: Local processing for core features
3. Stirling PDF
Stirling PDF is open-source software you can run on your own server. It has over 60 tools for manipulation, conversion, and OCR. Because you host it yourself, no data leaves your infrastructure.
The setup requires Docker. For organizations handling sensitive documents, self-hosting solves the privacy problem completely.
The feature set matches most paid tools: merge, split, rotate, compress, convert, OCR, watermarks, password removal. Performance depends on your server, but it handled our test files quickly.
Free limits: None Platforms: Self-hosted (Docker) Privacy: Complete control
4. LibreOffice Draw
LibreOffice is a full office suite, and Draw handles PDF editing. Unlike most PDF editors that treat PDFs as images, Draw can import and edit the actual text in many PDFs.
This makes it useful for fixing typos or updating dates. The editing experience is more like a word processor than a PDF viewer.
The tradeoff: Draw treats PDFs as documents to edit, not forms to fill. Adding a signature to an existing form might reflow things unexpectedly. The learning curve is steeper than single-purpose PDF tools.
Free limits: None Platforms: Windows, Mac, Linux Privacy: Local processing only
5. Smallpdf
Smallpdf is a web-based tool with a clean interface. It handles compression, conversion, merge, split, and basic editing.
Files are uploaded to Smallpdf's servers for processing. According to their policy, files are deleted within one hour. Data is encrypted in transit using TLS.
The free tier limits you to two tasks per day. For occasional use on non-sensitive documents, this works.
Compression reduced our test file to 3.8MB, slightly better than PDF24.
Free limits: 2 tasks per day Platforms: Web browser Privacy: Server upload, files deleted within 1 hour
6. iLovePDF
iLovePDF is another web-based option. Merge, split, compress, convert, add page numbers, rotate.
Files are uploaded to their servers. Their policy states files are deleted within two hours. They have ISO 27001 certification.
The free tier allows one task per hour. Compression completed in about 4 seconds with good results.
Free limits: 1 task per hour Platforms: Web browser Privacy: Server upload, files deleted within 2 hours
7. PDF Candy
PDF Candy includes OCR in its free tier, which many online tools hide behind paywalls. Upload a scanned PDF and get searchable text back.
OCR accuracy was reasonable for printed text, though it struggled with low-resolution scans. Other tools include compression, conversion, merge, and split.
Files are uploaded for processing. The free tier limits you to one task per hour.
Free limits: 1 task per hour Platforms: Web browser Privacy: Server upload
8. Apple Preview
Preview comes pre-installed on every Mac.
It handles annotations, highlighting, signatures, form filling, and basic page manipulation. You can reorder pages, delete pages, and merge PDFs.
What it lacks: OCR, compression, and conversion to other formats. For signing documents or marking up drafts, Preview does enough. Everything processes locally.
Free limits: None Platforms: Mac only Privacy: Local processing only
9. SumatraPDF
SumatraPDF is a reader, not an editor. It opens large PDFs nearly instantly and uses minimal system resources.
The application is portable, supports PDF, EPUB, MOBI, XPS, and DjVu, and has keyboard shortcuts for navigation.
If you need to read PDFs quickly, SumatraPDF works well. If you need to edit or annotate, use something else.
Free limits: None Platforms: Windows Privacy: Local only
Comparison table
| Tool | Local/Cloud | Platforms | OCR | Free limits | Privacy |
|---|---|---|---|---|---|
| PDF24 Creator | Local | Windows | Yes | None | High |
| PDFgear | Local | Win/Mac/iOS | Yes | None | High |
| Stirling PDF | Self-hosted | Docker | Yes | None | Complete |
| LibreOffice Draw | Local | Win/Mac/Linux | No | None | High |
| Smallpdf | Cloud | Web | Paid | 2/day | Medium |
| iLovePDF | Cloud | Web | Paid | 1/hour | Medium |
| PDF Candy | Cloud | Web | Yes | 1/hour | Medium |
| Apple Preview | Local | Mac | No | None | High |
| SumatraPDF | Local | Windows | No | None | High |
Which tool to use
For sensitive documents, use PDF24, PDFgear, or Stirling PDF. These process files locally. If your organization has Docker infrastructure, Stirling PDF gives you complete control.
For occasional tasks on non-sensitive files, Smallpdf or iLovePDF work fine. The file upload is a tradeoff for convenience.
For Mac users, start with Preview. If you need OCR or more editing power, add PDFgear.
For Windows users who read more than they edit, SumatraPDF is the fastest reader. Pair it with PDF24 for manipulation.
For text editing (not just annotation), LibreOffice Draw can edit PDF text content directly.
The privacy problem with free PDF tools
When you use an online PDF tool, your file gets uploaded to a server, processed, and sent back. The tool's operator has access to your document during this process. For a deeper look at what happens to your files and when it matters, see why PDF tools upload your files.
Most services delete files within hours. But "delete" means different things to different companies. Backups might persist. Logs might record file metadata. Processing might happen in jurisdictions with different privacy laws.
PDFs are a common attack vector. 22% of malicious email attachments are PDFs, according to Check Point Research. Tax returns, medical records, contracts, and internal business documents deserve more caution.
Local tools eliminate this concern. When you use PDF24 or PDFgear, the file never leaves your computer. When you self-host Stirling PDF, you control the entire processing chain.
Browser-based tools can work locally too. PDF-Builder processes files in your browser without uploading them to any server.
If you're not sure whether a file is sensitive, treat it as if it is.
Summary
Most online PDF tools upload your files to external servers. Local tools keep files on your device.
Self-hosted options like Stirling PDF give organizations complete control over document processing.
Online tools are fine for non-sensitive files. For anything confidential, use local processing.
Free doesn't mean limited. PDF24 and Stirling PDF have feature sets that match paid software.
Mac users have Preview built in. Windows users should consider PDF24 for manipulation and SumatraPDF for reading.
The best free PDF tool depends on your privacy needs. For most users, that's PDFgear or PDF24. For organizations with strict requirements, that's Stirling PDF.