Frequently asked questions
Is it really free?
Yes. Every one of the 55 tools is free, with no file limits, no watermarks and no account. Mabuy's Kit is a static site, so there is no server bill to pass on to you.
Do my files get uploaded anywhere?
Never. The PDF engines (including a WebAssembly build of pdf.js and pdf-lib) are downloaded to your browser once, and every operation runs locally. You can disconnect from the internet after the page loads and everything still works.
Does it work offline or on mobile?
Yes. Because processing happens in the browser, the tools work on Windows, macOS, Linux, Android and iOS. Load the page once and you can even go offline: nothing is sent anywhere.
What is the catch? Why is it free?
There is no catch: no ads, no trackers, no data selling. Privacy-first tooling is a better default, and building it in the open keeps it honest. If you find it useful, sharing it helps.
Are there file size limits?
No artificial limits: the only ceiling is your device’s memory. Files up to a few hundred megabytes work well on a modern laptop; massive scans are better handled on a desktop than a phone.
Can I use it on confidential documents?
That is exactly what it is designed for. Contracts, medical records and legal documents never leave your machine, which keeps you aligned with GDPR, HIPAA and CCPA requirements without a data-processing agreement.
Which PDF engine do you use?
Two: pdf-lib for authoring and modifying documents, and pdf.js for rendering pages to canvas. SheetJS handles spreadsheets, Mammoth handles Word files and JSZip handles archives, all loaded locally, only when a tool needs them.
Can I self-host this?
Yes. It is a static site with no backend, so any web server or internal file share works. That makes it suitable for environments where documents may not leave the network.
Why do some tools re-render pages as images?
Colour effects (invert, grayscale, grayscale-ish adjustments, scanner effect, aggressive compression) change pixels, not vector instructions, so the page is rasterised at your chosen DPI. The output looks right but its text is no longer selectable. Tools like resize, N-up and merge stay vector-based and keep text sharp.
Is a redacted file really safe?
With the redaction tool’s “rasterise pages” option enabled, yes: the page is redrawn as an image with the bars burned in, so the covered text no longer exists in the file. Without that option the bar only covers the content visually. Which is exactly the mistake that has leaked documents before.