Beyond PDFs, it supports eBook formats (ePub, Mobi), Comic Book files (CBZ, CBR), and XPS.

It is arguably the fastest PDF reader available. It opens large documents instantly because it lacks the heavy "bloat" found in Adobe Acrobat.

If you are looking for a review of the actual software (Sumatra PDF 3.5.x),

The latest stable version of Sumatra PDF is 3.5.2 (as of late 2023). A "2023 Crack" for an older version (3.5.1) is a red flag for a template-generated scam site. Legitimate Review of Sumatra PDF

You can download a portable version that runs from a USB drive without installation.

You should any download link labeled "Sumatra-PDF-Reader-3-5-1-Crack-2023-Full-Version-Free-Download." This is a common scam tactic for several reasons:

The software is a legitimate open-source project released under the GPLv3 license. There is no "Pro" or "Full" version to buy, meaning there is no need for a "crack."

Sites offering "cracks" for software that is already free are almost certainly distributing malware, spyware, or ransomware . These files often contain executables designed to infect your computer once opened.