Top PDF Software for Annotations

Between them, the 8 PDF software on this page cover merge / append (7), encryption (7) and watermarking (6). 8 of them have written a profile you can read before you get in touch.

1. 1

   

   Smallpdf

   Convert to PDF · Merge / Append · File Type Conversion

   Smallpdf is a Swiss company that makes web-based document tools centred on PDF files. It describes its approach as stripping out unneeded features and concentrating on ease of use.

   Write a review

   Why #1: Launched 2013 — as stated on its own website, read 5 Oct 2026

   Not yet on record: client reviews, vetting.

2. 2

   

   Foxit Reader

   Convert to PDF · Merge / Append · Digital Signature

   Foxit Reader belongs to the Foxit family of PDF tools. The company sells software for viewing, editing, signing and managing PDF files, and also provides tools for developers to…

   Write a review

   Why #2: 24/7 support · Uptime SLA · SOC 2 Type II · GDPR compliant · Placed below first here: a listing leads at most 5 rankings — as stated on its own website, read 5 Oct 2026

   Not yet on record: client reviews, vetting.

3. 3

   

   PDF Reader Pro

   Convert to PDF · Merge / Append · File Type Conversion

   PDF Reader Pro is document software for viewing and working on PDF files across desktop and mobile.

   Write a review

   Why #3: GDPR compliant — as stated on its own website, read 5 Oct 2026

   Not yet on record: client reviews, vetting.

4. Also listed, not yet ranked. We hold nothing checkable on these yet that ranks them here: no client review, vetting, award, expert review, or fact stated on their own website (and on a place ranking, where they are based). They follow in order of their TrustList Score. How TrustList ranks · Get vetted, free
5. –

   

   DocShifter

   Convert to PDF · Merge / Append · File Type Conversion

   DocShifter converts documents to PDF automatically, adds enrichment and runs quality checks. It handles many input formats and stores the finished renditions where users want them.

   Write a review
6. –

   

   Kofax Power PDF Advanced

   Convert to PDF · Merge / Append · Digital Signature

   Kofax Power PDF Advanced is a PDF application aimed at business users. It lets staff make, convert, edit and share PDF documents.

   Write a review
7. –

   

   PDF4me

   Convert to PDF · Merge / Append · Digital Signature

   PDF4me is an online document tool for working with PDF files. It combines simple everyday functions, such as joining pages, with more advanced ones, such as text recognition on…

   Write a review
8. –

   

   Adobe Acrobat Reader DC

   Convert to PDF · Digital Signature · PDF Reader

   Adobe Acrobat Reader DC is a PDF reader. People use it to open and read PDF files on their computers.

   Write a review
9. –

   

   PDF24 Online Tools

   Convert to PDF · Merge / Append · Digital Signature

   PDF24 Online Tools is a set of web tools for common PDF problems. It brings together about 30 separate functions, each aimed at a specific task.

   Write a review

Articles

Latest insights

The newest guides and analysis from TrustList Insights.

All articles

Invoice Management

5 Oct 2026 · TrustList Editorial

Nine e-invoicing and tax-system deadlines in four days of news, and none of them in the EU or the US

Our own count: nine e-invoicing and tax-system changes published 2 to 5 October from seven countries, none in the EU or US. Median warning…

Nigeria

5 Oct 2026 · TrustList Editorial

Nigeria: NITDA National AI Innovation Challenge for N-ATLAS builders closes applications on 12 October 2026

Nigeria's digital economy ministry, through NITDA's NCAIR, takes applications until 12 October 2026 for working solutions built on the…

Spain

5 Oct 2026 · TrustList Editorial

Spain: Red.es opens a 40 million euro call for AI use cases aimed at SMEs and startups, open until about 10 November 2026

Red.es has invited associations and technology centres to build AI use cases that SMEs and startups can reuse. Budget EUR 40 million, up to…