Convert a large or problem Publisher file to PDF
If your Publisher file is packed with images, runs to hundreds of megabytes, or keeps failing in free online converters, Zamzar is built to handle it. You can upload large PUB files and get a complete, accurate PDF back without the size restrictions that stop basic tools from finishing the job.
Why do large Publisher files need a different approach to convert?
Large PUB files, corrupted files, or files that keep throwing errors can all stop you from getting your content into a usable format, and Zamzar can convert them to PDF even when other tools can't cope. Free online converters often impose file size limits that rule them out before you've even started, and desktop software may simply refuse to open a file that's developed a fault.
The file size issue comes up more often than you'd expect. A PUB file packed with high-resolution images, embedded graphics, or many pages of content can easily run to several hundred megabytes.
If you're hitting a similar dead end, uploading the PUB file to Zamzar is worth trying before you assume the work is lost. Zamzar's support team can also help if the conversion itself runs into a problem, diagnosing issues such as font conflicts that might be causing the error in the first place. Jeff Mallory put it plainly in a Zamzar review: "I had old, emotionally significant, huge MS Publisher files, lots of pictures (500MB+ worth in each pub file!). Too big for the online free file format translators. Zamzar let me sign up for a month, _perfectly_ translate my pub files into docx files and recapture the unique pictures in the old pub files. Their translation did a superb job! Highly recommend Zamzar format translation services. thanks, Zamzar!"
Convert Publisher files that free tools can't handle
Many free online converters have tight file size limits, often a few megabytes, which makes them useless for Publisher files packed with high-resolution images. Zamzar supports much larger uploads, so you can convert PUB files that run into the hundreds of megabytes without hitting a wall mid-conversion.
Get past errors and timeouts that stop other converters
Large or complex Publisher files often cause free converters to time out or return an error without explaining why. Zamzar's conversion pipeline is designed to handle these files, so if another tool has failed on your PUB file, it's worth trying Zamzar before assuming the file itself is damaged.
Preserve embedded photos in a large Publisher file
Publisher files used as catalogues, photo books, or design portfolios can contain hundreds of high-resolution images, which is what pushes them past the limits of basic converters. Zamzar keeps those images in the converted PDF, so the resulting file is a faithful version of the original layout rather than a stripped-down approximation.
Upgrade your plan for very large PUB files
If your PUB file is too large for the free tier, signing up for a Zamzar paid plan gives you a higher upload limit and lets you convert the file in full. As one customer found, signing up for a single month was enough to convert their large Publisher archive and retrieve all the images inside it.
Frequently asked questions
What's the maximum file size I can upload for free?
The free tier has a file size limit for each conversion, and very large Publisher files may exceed it. Upgrading to a paid plan increases the limit so you can convert larger PUB files without splitting them first.
Should I split a large Publisher file before converting it?
If your file is too large for the free tier, splitting it into smaller sections is one option, though it's more work than simply upgrading your plan. Zamzar's paid plans are designed for exactly this situation, so a temporary upgrade is often the simpler solution.
Will a very large PDF be easy to share after converting?
PDFs with lots of high-resolution images can still be quite large after conversion, which may make them tricky to email. Sharing via a cloud storage link or a file transfer service is usually the most practical option for large converted PDFs.
Can Zamzar convert a Publisher file that another tool said was corrupt?
Sometimes a file that fails in one converter will work in another, because different tools handle edge cases differently. It's worth trying Zamzar even if another converter reported an error, since the file may not actually be damaged.
Is it safe to upload a large Publisher file with personal photos?
Zamzar uses secure uploads and deletes files after a set period, so your photos aren't stored indefinitely. If your Publisher file contains personal or confidential images, it's worth reviewing Zamzar's current data retention policy before uploading.
How long does it take to convert a large Publisher file?
Conversion time depends on the size and complexity of the file, so a large PUB file with hundreds of images will take longer than a simple one-page document. Zamzar processes conversions in the background, so you can wait on the page or come back when it's done.
Will the PDF be smaller than the original PUB file?
PDFs are often smaller than the equivalent Publisher file because the conversion process can compress images and remove Publisher-specific metadata. The exact difference depends on the content of your file, but it's common for the PDF to be noticeably smaller.
Can I convert multiple large PUB files at once?
Zamzar supports batch conversions, though the number of files you can process at once depends on your account plan. If you've got a large archive of PUB files to convert, it's worth checking your plan limits before you start.
My Publisher file has linked images rather than embedded ones. Will those come through?
Linked images in a Publisher file point to external files on your computer, so they may not be included if Zamzar can only access the PUB file itself. For best results, embed images in the Publisher file before uploading if you have the option.
What if the conversion completes but the PDF is missing some images?
Missing images in the PDF often indicate that those images were linked rather than embedded in the original Publisher file. If that's the case, the PUB file itself needs to have the images embedded before converting, which requires access to Publisher or a compatible program.