AirGapKit — Offline file tools in your browser

The air gap

Your files stay where they are.

No cloud pipeline. No mystery servers. Open a file, process it offline, download the result. Built for people who treat documents like private property.

50+ tools across PDF, convert, security, image, office, and text — in one extension.

Capability map

What you can do.

Pick a suite. Every tool below ships in AirGapKit today.

Merge PDFCombine multiple PDFs into one document
PDF Page ManagerSplit, delete, reorder & rotate pages visually
Compress PDFShrink size with optional advanced optimizations
Sign PDFPlace visual signatures on pages
Fill Form & EditFill interactive forms and add text
Create Fillable FormDraw text fields and checkboxes onto PDFs
Annotate PDFHighlights, notes, and freehand ink
Redact PDFPermanently cover sensitive regions
Watermark & NumbersAdd watermarks and page numbers
PDF Lock ⇄ UnlockPassword-protect or remove protection
PDF CompareSide-by-side visual document compare
PDF RepairFix broken indexes and xref tables
Crop PDFTrim margins and unwanted areas
Flatten PDFBurn form fields into static content
PDF OCRSearchable PDFs with offline language packs
PDF OverlayStamp one PDF onto another
Change Page SizeConvert pages to A4, Letter, and more
Document InfoEdit title, author, subject, keywords
PDF ViewerBuilt-in reader with zoom and search

Workflow

Three steps. Still offline.

Designed for focused work, not account dashboards.

Install the extension

Load AirGapKit in Chrome or Firefox. Your toolkit lives in the browser — not on a remote workspace.
Drop a file into a tool

PDF, image, spreadsheet, or text. Processing happens in memory on your device.
Save the result

Download the output when you are ready. Nothing was uploaded along the way.

Your files stay where they are.

What you can do.

Three steps. Still offline.

Install the extension

Drop a file into a tool

Save the result

Keep the gap closed.