Free open-source PDF editor KillerPDF adds a full command-line interface
KillerPDF is a free, offline PDF editor for Windows (10/11, 64-bit) that runs as a single portable file with no installer, no account, and no tracking. It displays documents using PDFium and writes files using PdfSharpCore. Version 1.6.4 focuses on two things.
First, every core operation — merging, splitting, extracting pages, decrypting, converting to images, flattening, printing, OCR (recognizing text in images), and batch re-saving — can now run headlessly from the . These commands reuse the exact same processing pipelines as the graphical app rather than a separate , so there's no second code path to drift out of sync, they work even while the app is already open, and they return proper exit codes for use in scripts and batch jobs. Second, save was improved: the underlying PdfSharpCore library was patched with six standards- fixes, and every release is checked against a 2,900-file test set using the veraPDF tool.
The goal is that saving a file repeatedly never degrades its PDF/A standards . results are published in the project's /RESULTS.md file. The release also fixes a bug and several smaller bugs, and upgrades the SixLabors.ImageSharp library from 1.0.4 to 2.1.13.
Key points
- Free, offline PDF editor for Windows 10/11 (64-bit); single portable file, no accounts, no tracking
- Version 1.6.4 exposes all core — merge, split, extract pages, decrypt, convert to image, OCR, and more — via CLI
- The CLI reuses the same internal pipelines as the GUI, avoiding a separate code path that could drift out of sync
- Every save is validated against a 2,900-file test corpus to confirm PDF/A standards
- Upgraded the image-processing library to 2.1.13 and fixed a bug plus other issues