PUB to PDF Converter

Convert PUB to PDF online for free. Fast, secure, and high-quality conversion with no sign-up or software required.

Free to useNo file stored beyond 1 hourEncrypted over TLS 1.2/1.3No watermarks

or drag and drop files here

Maximum file size is 1GB

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How it works

Three steps to your converted file

Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.

Upload your file

Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.

Choose an output format

Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.

Convert & download

Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.

What is a PUB file?

The PUB file extension denotes a desktop publishing document created by Microsoft Publisher, a component of the Microsoft Office suite. This proprietary format utilizes the Object Linking and Embedding (OLE) structured storage container to manage page layout components, including vector graphics, raster images, formatted text, and separate objects. Unlike standard word processing documents, PUB files prioritize absolute positioning of page elements for print-ready output. The format lacks a public specification, making interoperability with non-Microsoft software limited to reverse-engineered implementations.

How to open a PUB file

Opening PUB files requires Microsoft Publisher on Windows systems for full fidelity. For users without access to the native application, LibreOffice Draw provides partial support through reverse-engineered filters, though layout inconsistencies may occur. While Microsoft Word cannot natively open PUB files, Adobe InDesign can import them via third-party plugins like Pub2ID. There is no native support for this format on macOS or Linux kernel-based operating systems without virtualization or conversion tools.

PUB Technical Info

Full Name: Microsoft Publisher Document
Developed By: Microsoft Corporation
Initial Release: 1991
MIME Type: application/x-mspublisher

What is a PDF file?

The Portable Document Format (PDF) is a comprehensive file format, standardized as ISO 32000, designed to present documents consistently independent of application software, hardware, and operating systems. It encapsulates a complete description of a fixed-layout 2D document, including text, fonts, vector graphics, and raster images, based on the PostScript language. Advanced implementations support interactive form fields, JavaScript scripting, 3D objects (U3D/PRC), and various encryption standards.

How to open a PDF file

PDF viewing is natively supported by all major modern web browsers (Chrome, Edge, Firefox, Safari) and most operating systems via built-in previewers. For advanced manipulation, form filling, or pre-press validation, dedicated software such as Adobe Acrobat DC, Foxit Reader, or open-source tools like Ghostscript and Poppler is required.

PDF Technical Info

Full Name: Portable Document Format
Developed By: Adobe Inc. / ISO
Initial Release: 1993
MIME Type: application/pdf

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Why RunConvert

The fastest way to convert any file

Purpose-built for speed, privacy, and breadth of format support.

Convert PUB to PDF in seconds

Every PUB to PDF conversion runs on our servers, so your device stays fast and the output quality stays intact.

Fast, cloud-powered

No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.

Secure & private

Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.

Free - no account needed

Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.

Developer API

Convert PUB to PDF via API

Automate PUB to PDF conversions in three steps: create a job, upload your file, then poll for the result.

# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "pub-to-pdf",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "pdf"
      },
      "export-result": {
        "operation": "export/url",
        "input": "convert"
      }
    }
  }'

# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.pub

# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
  -H "Authorization: Bearer YOUR_API_KEY"

Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.