ZiruPDF

ZiruPDF is a desktop PDF tool for 64-bit Windows 10 and 11, developed by ZiruLab. What sets it apart is less the feature list than the terms of use: every feature is free for personal, educational, internal company and commercial work, core features have no usage limits, and no account is needed after installation. Files are processed on your own computer, so nothing has to be uploaded to a server.

In one application you can read and annotate PDFs, edit text and images, reorganise pages, convert between PDF and Word, Excel, PowerPoint or images, and compress, password-protect, digitally sign or watermark files. OCR recognises Chinese, Japanese and English and adds a searchable text layer to scanned PDFs. For repetitive work, you can combine several steps into a task, preview the result, run it on many files at once, and save the task to reuse later. The official site also offers browser tools for merging, splitting and compressing images, which likewise process files on your device.

Note: ZiruPDF is not open source, and the installer may not be redistributed without permission. It is not yet code-signed, so Windows may warn about an "unknown publisher" on first install. Download only from the official site and check the file size and SHA-256.