Skip to main content
Document Conversion

Convert PUB to CHM Online — Free

Fast, free PUB to CHM converter. No registration required.

or import from

2M+ Files Converted

Trusted by thousands of users

Secure Transfer

HTTPS encrypted uploads

Privacy First

Files auto-deleted after processing

No Registration

Start converting instantly

Works Everywhere

Any browser, any device

How to Convert

1

Upload your .pub file by dragging it into the upload area or clicking to browse.

2

Choose your output settings. The default settings work great for most files.

3

Click Convert and download your .chm file when it's ready.

What is PUB?

PUB is the native file format of Microsoft Publisher, a desktop publishing application used for creating flyers, newsletters, brochures, postcards, and marketing materials with precise layout control.

Format Details

Full Name
Microsoft Publisher
Extension
.pub

Key Features

  • Desktop publishing
  • Layout control
  • Print design
  • Marketing materials

What is CHM?

CHM (Compiled HTML Help) is Microsoft's proprietary help file format introduced with Windows 98. It compiles HTML pages, images, and an index into a single compressed archive viewed with the Windows Help viewer.

Format Details

Full Name
Compiled HTML Help
Extension
.chm

Key Features

  • Compiled HTML
  • Search index
  • Table of contents
  • Windows Help viewer

PUB vs CHM

FeaturePUBCHM
Full NameMicrosoft PublisherCompiled HTML Help
Extension.pub.chm
Best ForDesktop publishingCompiled HTML

Frequently Asked Questions

We use advanced conversion technology to preserve fonts, formatting, tables, and page layout. Complex documents with unusual fonts or embedded objects may have minor differences, but content accuracy is always maintained.
Yes. Our OCR (Optical Character Recognition) technology extracts searchable text from scanned PDFs. Pro users get access to enhanced OCR for better accuracy on complex documents.
For PDF output, fonts are embedded to ensure your document looks the same everywhere. For other formats, we use the closest available system fonts to match the original styling.
All uploads use 256-bit SSL encryption. Files are automatically deleted within 2 hours. We never access, store, or share your document contents. GDPR compliant.
Password-protected files must be unlocked before conversion. Remove the password first, then upload for conversion. We cannot bypass document encryption.

Related Conversions

PUB to PDFPUB to DOCXPUB to DOCPUB to TXTPUB to RTFPUB to ODTPUB to HTMLPUB to DjVu