I have many e-books. Some of it in txt format, some in PDF, some in DjVu. Can you advise one viewer (freeware of course) for all of this books? Adobe Reader is great, but can't open DjVu, and i want use only one software for all this documents

Dani AI

Generated

Good followup by — a single-reader approach is convenient for mixed e-book libraries. Below are a few maintained alternatives and practical tips to pick the best workflow today (Windows 10/11).

SumatraPDF is the lightest general-purpose choice: fast, portable, and supports PDF, DjVu, XPS, EPUB, MOBI, CHM, CBZ/CBR. It is ideal if annotations and heavy editing are not required. SumatraPDF

For DjVu-heavy collections, use a dedicated DjVu frontend plus the DjVu engine. WinDjView is a Windows-native reader tuned for scanned books (continuous scrolling, bookmarks, printing) and relies on the DjVu engine. The underlying DjVuLibre project provides the encoding/decoding tools and command-line utilities you can use for batch conversions when needed. WinDjView

If a more full-featured, cross-platform viewer is wanted (annotations, robust printing, many backends), consider Okular from KDE; it supports DjVu and PDF with annotation features. Okular

Practical tips: try portable builds first so you can test file associations without changing your system. Choose SumatraPDF for everyday reading, WinDjView for deep DjVu browsing, and DjVuLibre tools when you need to convert or batch-process files (for distribution to devices that lack DjVu support). Always download from the official project pages and keep readers updated; avoid third-party installers that bundle adware. If scanned DjVu files require text search or exporting, check whether they already contain an OCR text layer before running OCR again.

On another forum i found this software: STDUViewer. Nice program. It's solve my problem.

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