Note that apart from the image addendums, this is not an open source PDF editor -- you'd want to look into LibreOffice Draw for that.
Standout features
- Very customizable
- Open source and multi-platform (Linux and Windows)
- Wide format support, including ePub, images, markdown, comics (both cbz and cb7), and may more.
- Quick and responsive (notable as a lot of PDF tools that I test are not)
- Opens even the latest format password-protected PDF files
- Dark or gray skin for the interface
- For the voice-to-text bit, I'd like to have the play/pause visible in the interface (right now it's under a menu item) and highlight the words as they're being read. I know that sounds specific but it's fantastically useful when you're trying to learn new material from a PDF.
- Export to other formats, e.g. move a PDF file into TIFF
- Support for secure image archives
- AVIF image support
- Download 7z file from https://binary-factory.kde.org/job/Okul ... ase_win64/ (I downloaded okular-21.12.3-965-windows-msvc2019_64-cl.7z) and decompress
- Launch bin\Okular.exe
Resources: 50 megs ram, 346 megs disk space. Still a lot less than the Adobe PDF editor. Low CPU usage.
Webpages
https://okular.kde.org/
https://www.softpedia.com/get/Office-to ... ular.shtml