Best PDF Tools Online — Free, Browser-Based, Private
Merge, split, compress, and convert PDFs online. All processing runs in your browser — your files never leave your device. Free, no account, no upload to third-party servers.
What This PDF Toolkit Covers
This PDF toolkit handles the most common PDF tasks without requiring you to upload files to a third-party server. Unlike iLovePDF or Smallpdf — which process files on their servers — all operations here run locally in your browser using PDF.js and similar browser-native libraries.
- Merge PDFs: Combine multiple PDF files into one in the order you choose
- Split PDF: Extract specific pages or split by page range
- Compress PDF: Reduce file size for email attachments and uploads
- Image to PDF: Convert JPG, PNG, and WebP images to PDF format
- PDF to image: Extract pages as image files for editing
- 100% private: Files are processed locally — never sent to any server
Choose the Right PDF Tool
- This page: Full PDF toolkit overview — merge, split, compress, convert
- PDF Tools: All PDF operations in one place
- Image Tools: Compress and convert images before converting to PDF
Step-by-Step: Merge PDFs
- Open PDF Tools and select the Merge option
- Upload the PDF files you want to combine — drag and drop or use the file picker
- Arrange them in the order you want using the sort interface
- Click Merge and download the combined PDF file
- All processing happens in your browser — no files are uploaded anywhere
When to Use Browser-Based vs Server-Based PDF Tools
- Use browser-based (this tool) when: Documents contain sensitive content (contracts, financial statements, medical records, legal documents), you need no-trace processing, or you're in a restricted network environment
- Consider server-based tools when: Files exceed browser memory limits (typically 100+ MB PDFs), you need OCR (optical character recognition), or you require advanced editing with form field support
- File size limits: Browser-based PDF processing is constrained by available RAM — most devices handle PDFs up to 50–100 MB comfortably; very large files may require a native app
Privacy and Data Handling
All PDF processing runs locally in your browser. Your documents — including any sensitive content — are never uploaded to or stored on any server. Processing is done using client-side JavaScript libraries. Files are not retained after you close the tab.
Frequently Asked Questions
Are PDF files sent to a server when I use this tool?
No. All operations — merging, splitting, compressing, and converting — run locally using JavaScript in your browser. The files never leave your device. You can verify this by opening your browser's Network tab (F12 → Network) before uploading a file — you'll see no requests containing your file data. This is the primary advantage over services like Smallpdf or Adobe Acrobat Online, which upload your files to their servers.
Can I merge password-protected PDFs?
Password-protected PDFs cannot be merged without first removing the password protection. If you have the password, most PDF viewers (Adobe Reader, Preview on Mac) allow you to save an unprotected copy: open the file, enter the password, then save/export as PDF without the password. Once unprotected, the file can be merged normally. Never use an online tool that asks you to upload a password-protected PDF and enter the password — that exposes both the document and its access credential.
What's the best way to compress a PDF that's too large to email?
The most effective compression targets images embedded in the PDF — these account for most of the file size. Use the compress function and select a lower image quality setting for the best size reduction (typically 60–80% quality reduces file size significantly with minimal visible quality loss for screen viewing). For PDFs with lots of text and few images, compression gains are minimal. If the PDF was created from a Word document, re-exporting with lower image quality settings at the source often produces better results than re-compressing.