The Best PDF Tools in 2026

For plain reading and markup, you may not need to install anything. Modern browsers like Firefox and Chrome render PDFs well and let you fill simple forms. When you want more, Adobe Acrobat Reader remains the reference reader and handles complex forms and digital signatures reliably. If you prefer something lighter and ad-free, SumatraPDF on Windows is fast and minimal, and Foxit's reader is a long-standing alternative.

For annotation specifically, look for highlight, comment and stamp tools. Acrobat Reader and Foxit both cover these; SumatraPDF is more of a pure viewer.

True content editing, changing the actual text and images in a PDF, is harder and is where many free tools fall short. Acrobat's paid tiers do it best. Among free options, LibreOffice Draw can open many PDFs and let you edit elements before re-exporting, which is handy for occasional fixes. For form creation and richer editing without a subscription, look at apps like PDF24 on Windows or the open-source PDFsam for structural work.

Keep expectations realistic: PDFs are designed to be fixed-layout, so heavy text editing is never as clean as in a word processor. When you can, edit the original document and re-export.

Combining several PDFs into one, pulling pages out, or shrinking a file to fit an upload limit are the most common tasks of all. PDFsam Basic is a free, open-source desktop app built specifically for merge, split, rotate and extract operations, and it does this entirely on your computer. PDF24 Tools offers a broad set of free utilities with both desktop and web versions.

• Merge: combine multiple files into a single document.
• Split: break a large PDF into smaller pieces or single pages.
• Compress: reduce file size for email or upload.
• Rotate and reorder: fix scanned pages that came in sideways.

Electronic signatures are everywhere now. Acrobat Reader can apply a signature for free, and many ecosystems include built-in signing. For password protection and encryption, several free tools can add a password to a PDF; just remember that a forgotten password can lock you out permanently, so store it safely.

If you are signing legally binding documents, prefer reputable established providers and understand the difference between a simple drawn signature and a certificate-based digital signature, which offers stronger proof of authenticity.

Browser-based PDF tools are convenient, but most of them upload your file to a remote server to do the work. For a flyer or a meme that is fine. For a contract, a medical record or anything with personal data, prefer a desktop app that processes files locally. PDFsam, PDF24's desktop build, SumatraPDF and LibreOffice all keep your documents on your machine.

Whatever you choose, get it from the official domain and scan the installer first. Avoid the swarm of clone sites that imitate popular PDF tools to distribute adware.