BuildPDF is a free, privacy-first online tool that converts files to PDF directly in your browser — no uploads, no accounts, no watermarks. We believe file conversion should be simple, fast, and completely private.
BuildPDF started from a simple frustration: every "free" PDF converter online either requires creating an account, uploads your sensitive documents to unknown servers, adds watermarks, or hits you with a paywall after one conversion.
We set out to build something better — a tool that runs entirely in your browser using modern JavaScript libraries. When you convert a file on BuildPDF, your document never leaves your device. There's no server processing, no data collection, and no hidden fees. Ever.
Our mission is to make high-quality file conversion accessible to everyone, regardless of their technical skill level or budget. We believe that basic productivity tools — like converting an image or document to PDF — should be free, fast, and private by default.
BuildPDF is supported by unobtrusive advertising, which allows us to keep the tool completely free for all users without compromising on quality or privacy.
Your files are processed 100% locally in your browser. We never see, store, or transmit your documents. Your data stays on your device.
No sign-ups, no email verification, no download queues. Drop your file, click convert, and download your PDF in seconds.
BuildPDF works on any modern browser — Chrome, Firefox, Safari, Edge, or Brave — on desktop, tablet, and mobile devices.
No premium tiers, no conversion limits, no watermarks. The full tool is free for everyone, sustained through minimal, respectful advertising.
BuildPDF uses a combination of trusted open-source JavaScript libraries to handle all conversions directly in your browser:
jsPDF generates PDF documents from images and text. Mammoth.js converts Word DOCX files to clean HTML, which is then rendered into PDF. PDF.js (by Mozilla) extracts text and renders page images from existing PDFs. JSZip packages multi-file outputs into downloadable ZIP archives.
All of these libraries run client-side — meaning the processing power comes from your own device, not from a remote server. This is what makes BuildPDF both fast and private.
BuildPDF is an independent project created and maintained by a small team passionate about building useful, privacy-respecting web tools. We're real people who use the tool ourselves every day — and we're committed to keeping it free, honest, and continuously improving.
Have a question or want to report a bug? We'd love to hear from you on our Contact page.