About Mabuy's Kit

Free, private, browser-based PDF tools. Merge, split, compress, convert, sign, edit and organise PDF files without ever uploading them to a server.

Why this exists

Handling a private document should not mean handing it to a stranger’s server. Server-side converters need an upload endpoint, a temporary folder and a retention policy: three things that can fail. Mabuy's Kit removes them: the browser already has a file picker, a sandbox and enough computing power to do the work, so that is where the work happens.

What is inside

• • 55 tools covering organisation, editing, conversion, optimisation and inspection.
• • A pure-static front end: plain HTML, CSS and JavaScript, no build step, no framework, no backend.
• • Local engines: pdf-lib and pdf.js (WebAssembly-ready), JSZip, SheetJS and Mammoth for Office formats.
• • Open source (MIT): audit it, self-host it, change the branding.

Honest limitations

• • Very large files are limited by your device’s memory, not by us.
• • Scanned pages have no text layer, so text extraction returns nothing until you OCR them somewhere.
• • Docx, RTF, ODT and spreadsheets convert well; legacy binary .doc and HEIC depend on browser support.
• • A visual signature is not a cryptographic certificate, use a CA-issued certificate where that matters.