PDFisPDF — All Your PDF Tools in One Place
100% Free. No Watermarks. No Upload. 100% Private. Your files never leave your browser.
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Frequently Asked Questions
Merge PDFs
- How do I merge PDF files?
- Click "Select PDFs", choose your files, arrange them in the desired order, and click "Merge". The combined PDF downloads instantly.
- Is there a limit to how many PDFs I can merge?
- No. You can merge as many PDFs as your browser can handle. All processing happens locally on your device.
- Will merging affect the quality of my PDFs?
- No. PDFisPDF merges files without re-encoding, preserving original quality, fonts, and formatting.
Compress PDF
- How does PDF compression work without uploading?
- PDFisPDF uses WebAssembly to optimize your PDF structure locally in your browser — removing redundant data, optimizing streams, and reducing file size.
- Will compression reduce my PDF quality?
- The compression removes redundant data and optimizes the internal structure. Text and vector graphics remain lossless.
- How much can I reduce my PDF file size?
- Results vary by file. PDFs with embedded images typically see 20-60% reduction. Already-optimized files may see smaller gains.
Encrypt PDF
- What encryption does PDFisPDF use?
- PDFisPDF uses RC4-128 encryption (PDF Standard Security Handler, revision 3) as defined in the PDF 1.7 specification.
- Can I set different user and owner passwords?
- Yes. The user password is required to open the PDF. The optional owner password controls editing permissions.
- Is the encryption done locally?
- Yes. Encryption happens entirely in your browser. Your file and password never leave your device.
PDFisPDF processes all files locally in your browser using WebAssembly. No data is ever uploaded to a server. Visit PDFisPDF