LHT Reader opens thousands of files at once – PDFs, Word, Excel and PowerPoint files, pictures, emails, whole folders and web pages – in one window, and lets you read, mark up, compare, redact, sign, number, OCR and export them. On our test PC, a folder of 10,000 files was in and its first page on screen in 0.69 seconds. No account and no cloud: your documents never leave your computer. Free for Windows and macOS.