GitHub killertools.net

KillerPDF

~/killerpdf
$ killerpdf invoice.pdf

view high-quality rendering, thumbnails, zoom
edit inline text editing with font matching
annotate highlights, drawings, text boxes
sign reusable signatures, click to place
merge combine, split, reorder pages
flatten rasterize to fully uneditable PDF
print annotations flattened into output

Install or run portable. No account. No subscription. No telemetry.
Free. Open. GPLv3. Built by a field tech who hates Adobe.

$
Download for Windows (.zip)
Windows 10/11 x64 · ~6 MB · source (zip)
$ KillerPDF v1.2.0 · updated 4/24/2026
SHA256365a4ef2d2b606a58c309c2a1acd6f12f61391789ff798826d35792256290f9c
Now open source under GPLv3. View on GitHub →
oosmetrics Top 5 Desktop by velocityoosmetrics Top 2 Editors by velocity

What it does

View & Navigate

High-quality bitmap rendering via PDFium. Page thumbnails, Ctrl+scroll zoom, and keyboard shortcuts for fast navigation.

Merge & Split

Combine multiple PDFs into one or extract selected pages into a new file. Drag-and-drop page reordering in the sidebar.

Edit Text

Double-click any line of text to edit it inline. Font matching from the original PDF preserves the look of the document.

Annotate

Text boxes, freehand drawing, and highlight overlays with customizable colors, sizes, and opacity. Undo and clear per page.

Signatures

Draw and save reusable signatures. Click to place them anywhere on a page. Signatures persist between sessions.

Search & Select

Ctrl+F full-text search with highlighted results. Drag-select to copy text, or Ctrl+A to grab the whole page.

Print

Print with annotations flattened into the output. Ctrl+P or toolbar button sends directly to the system print dialog.

Install or Run Portable

Run the EXE directly from anywhere, or use the built-in installer to put it in Start Menu and register it as a PDF handler. No admin rights needed either way.

Password-Protected PDFs

Opening an encrypted PDF prompts for the password instead of throwing an error. Works seamlessly — the decrypted copy is held in temp for the session.

Flatten PDF

Save a fully uneditable version by rasterizing every page at 150 DPI via PDFium. Standard practice in legal, compliance, and reporting workflows. Annotations are burned in before flattening.