# SteveTheKiller/KillerPDF

Free and open-source PDF editor for Windows. View, annotate, OCR, merge, split, crop, rotate, compare, edit text, draw, sign, fill forms, print, flatten, and open password-protected PDFs without a subscription.

Repository: https://github.com/SteveTheKiller/KillerPDF
Canonical: https://ross.abutalabs.com/products/killerpdf
Homepage: https://KillerPDF.net
Language: C#
License: GPL-3.0
License Family: copyleft
Topics: dotnet, gplv3, opensource, pdf, pdf-editor, portable, windows, wpf, fast, small
Last push: 2026-08-26T20:04:03+00:00

## Health v2 (maintenance only)
Score: 81/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 99, longevity 10
- inputs: {"age_days": 140, "days_push": 7, "days_rel": 11, "gap_med": 4, "n_releases_24m": 26}
- flags: young
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3656, forks 277 (observed 2026-08-28T04:08:12.988558+00:00)

## What it is
KillerPDF is a free, open-source (GPL-3.0) PDF editor for Windows built with C# and WPF, offering viewing, annotation, OCR, form filling, signing, page organization, and text editing entirely offline. It ships as a small installer or portable executable with no accounts, subscriptions, or telemetry.

## Use cases
- edit text in a pdf without adobe subscription
- ocr scanned pdfs to make them searchable
- merge and split pdf files offline
- fill and sign pdf forms
- open password-protected or damaged pdfs
- annotate and highlight pdf documents
- batch process and flatten pdfs for printing

## When to choose
- you need a free, no-subscription Adobe Acrobat alternative on Windows
- you want fully local, private PDF processing with no cloud or telemetry
- you need a portable single-exe tool for field/IT support work
- you need offline OCR, form filling, and signing in one lightweight app

## When to avoid
- you need cross-platform support for macOS or Linux
- you require advanced professional publishing or prepress PDF workflows
- you need cloud-based collaboration or document sharing features

## Facets
- artifact type: application
- maturity: active
- function: pdf, ocr, image-processing, gui, pdf-viewer
- domain: pdf, files, developer-tools, windows
- platform: windows, dotnet
- tags: pdf-editor, pdf-annotator, form-filling, digital-signatures, portable-app, no-telemetry, wpf, pdfium, tesseract, gplv3, adobe-alternative, desktop

## Member repositories
- SteveTheKiller/KillerPDF (main) score 81

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:12.988558+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:31:37.462907+00:00, confidence not recorded.
  - readme: https://github.com/SteveTheKiller/KillerPDF (fetched 2026-08-28T04:08:12.988558+00:00, sha e3030322248a)
  - homepage: https://KillerPDF.net (fetched 2026-08-29T09:25:46.110598+00:00, sha c741207d072d)
  - site_page: https://killerpdf.net/about.html (fetched 2026-08-29T09:25:46.120269+00:00, sha 864bda1f7a6c)
- Data as of 2026-08-30T08:39:29.467469+00:00.