KillerPDF

Free plan Windows

What KillerPDF is

KillerPDF is a free Windows application for viewing, editing, organizing, comparing, filling, signing and converting PDF files. Its tools include inline text editing, annotations, OCR, form filling, signatures, page merging and splitting, printing and flattening. Core operations such as merge, split, decrypt, flatten, print, OCR and batch resave can run headlessly from PowerShell or cmd. Digital signing supports PFX or P12 certificates and the Windows certificate store, uses SHA-256 and embeds the certificate chain; Certum SimplySign cloud certificates are also supported. Processing, including OCR, runs locally, and the maker says no telemetry or ads are used. The software is open source under GPL-3.0, requires no account or subscription and is offered as an installer or portable edition. Windows 10/11 x64 is listed; the installer needs Microsoft .NET 10 Desktop Runtime, while the portable build includes its runtime. Update checks and extra OCR model downloads use the internet. Bug reports and feature requests go through a public GitHub issues page.

Who it suits

It suits Windows users who need local PDF editing, OCR, annotation, signing and command-line operations without an account. The stated platform is Windows 10/11 x64.

What it does well

Free GPL-3.0 open-source software
Local processing with no telemetry
Portable edition includes its runtime
Headless PowerShell and cmd operations
Supports OCR, editing and signing

What to know first

Windows 10/11 x64 only
Installer requires .NET 10 Desktop Runtime
Internet needed for updates and extra OCR models
No mobile or web platform listed

Plans

Plan	Billed and limits	Price
Free	GPLv3 open-source software · No account or subscription required · Windows installer and portable edition	Free
KillerPDF	Free, open source under GPLv3 · No account or subscription required	Free

As killerpdf.net lists them, read 20 Sept 2026. The maker's own page has the final word.

Verdict

KillerPDF provides a broad set of PDF tools in a free Windows application. Local processing, a portable edition and command-line support distinguish its stated workflow for desktop users.

Facts from KillerPDF's own pages

Annotation tools: Yes · killerpdf.net, 20 Sept 2026
Command line: Core operations including merge, split, decrypt, flatten, print, OCR and batch resave can run headlessly from PowerShell or cmd. · killerpdf.net, 11 Oct 2026
Distribution: KillerPDF is available as a compact installer and a portable edition; the portable edition includes its runtime and can run without installation. · killerpdf.net, 11 Oct 2026
Free plan: Yes · killerpdf.net, 20 Sept 2026
Integrations: The app supports signing with a Certum SimplySign cloud certificate. · killerpdf.net, 11 Oct 2026
Intended users: The maker says the app was built for PDF problems encountered by clients and users, including forms that will not fill or flatten and damaged or encrypted files. · killerpdf.net, 11 Oct 2026
License: KillerPDF is free software under the GPL-3.0 license. · killerpdf.net, 11 Oct 2026
Local processing: Document processing, including OCR, runs locally, and the site says no telemetry is sent. · killerpdf.net, 11 Oct 2026
Maker: The maker identifies himself as Steve the Killer and describes himself as a field technician and developer. · killerpdf.net, 11 Oct 2026
OCR: On-device OCR supports 19 languages, with additional language models downloaded on demand. · killerpdf.net, 11 Oct 2026
PDF conversion: Yes · killerpdf.net, 20 Sept 2026
PDF tools: Features include inline text editing, annotations, form filling, signatures, page merging and splitting, comparison, printing and flattening. · killerpdf.net, 11 Oct 2026
Privacy: The maker says KillerPDF has no ads or telemetry and performs PDF work locally; update checks and downloads of updates or extra OCR models use the internet. · killerpdf.net, 11 Oct 2026
Purpose: KillerPDF is a Windows PDF viewer, annotator and light editor for viewing, editing, OCR, organizing, comparing, filling and signing PDFs. · killerpdf.net, 11 Oct 2026
Requirements: The site lists Windows 10/11 x64; the installer requires the Microsoft .NET 10 Desktop Runtime, while the portable edition includes its own runtime. · killerpdf.net, 11 Oct 2026
Signing: Digital signing supports PFX or P12 certificates and the Windows certificate store, uses SHA-256, and embeds the certificate chain. · killerpdf.net, 11 Oct 2026
Support: The maker directs users to a public GitHub issues page to request features or report bugs. · killerpdf.net, 11 Oct 2026
Supported platforms: Windows 10/11 x64 · killerpdf.net, 20 Sept 2026
Text editing: Yes · killerpdf.net, 20 Sept 2026

Where KillerPDF stands on Freedom251

PDF editors#57 of 102