Offline-first Windows app
Offline PDF converter for private files.
CometPDF converts common work files to PDF on your Windows computer and also exports PDFs back to useful formats like images, text, Word, and PowerPoint. It is built for documents you do not want to upload to an online converter: contracts, quotes, invoices, internal spreadsheets, presentations, scanned images, and Outlook emails.
Most online PDF converters require you to upload your file to a server, process it remotely, and download the result. That works for generic files, but it is a problem for anything confidential. Contracts, financial spreadsheets, internal reports, and client emails should not pass through third-party servers. CometPDF is a Windows desktop app that converts files locally. Install it once, and conversion works without an internet connection. There are no server-side file size limits, no waiting for uploads, and no account required.
This page is for a Windows desktop app, not an online upload tool. Download CometPDF once, then convert files locally.
Download CometPDF
No uploads
Files stay local on the computer during conversion. This helps protect private documents, emails, client files, and internal office records.
Office aware
Uses Microsoft Office, Outlook, or LibreOffice when installed for print-like output that is close to the source application.
Batch conversion
Convert many files and optionally merge all results into one PDF, without repeating the same export steps manually.
Popular offline conversions
CometPDF is designed for practical Windows workflows: office documents, spreadsheets, presentations, image scans, text files, emails, and reverse PDF export tools. It is not a browser converter and does not require an upload queue, account, or cloud workspace.
FAQ
Does CometPDF work without internet?
Yes. After installation, CometPDF converts files entirely offline. No internet connection is needed for normal file conversion.
What file types does CometPDF support?
CometPDF supports DOC, DOCX, RTF, XLS, XLSX, XLSM, PPT, PPTX, MSG, EML, JPG, PNG, WEBP, BMP, TIFF, TXT, CSV, HTML, XML, JSON, and existing PDF files. It also includes reverse PDF export tools for PNG, JPG, TXT, DOCX, and PPTX.
Is there a file size limit?
There is no server-side limit because files are not uploaded. File size is limited by your local machine's memory and the application being used for conversion, such as Word or Excel.
Does it work on Windows 10 and Windows 11?
Yes. CometPDF runs on Windows 10 and Windows 11. It is built as a desktop application for common office and document workflows.
Is CometPDF free?
Version 1.1.0 is free. A Pro version with OCR, compression, watch folders, and PDF page tools is on the roadmap.