Convert OST to PDF

OST (Offline Storage Table) is Microsoft Outlook's file format for storing a local cache of your mailbox when using Exchange Server or Microsoft 365. Unlike PST files, OST files are tied to a specific Outlook profile and cannot be opened directly without the original account. Converting to PDF preserves your emails independently of the original account.

PST (Personal Storage Table) files are standalone archives you can open anywhere. OST files are synchronized caches tied to a specific Exchange/Microsoft 365 account and Outlook profile. OST files are often larger because they cache your entire mailbox. Both formats can be converted to PDF using our service.

Converting OST to PDF is useful when migrating to a new system, archiving emails before leaving an organization, creating compliance records, or preserving emails when you no longer have access to the original Exchange server or Microsoft 365 account.

Yes, OST conversion requires a registered account. This is because OST files can be large and contain many emails, requiring more processing power. Create a free account to get started.

Email attachments are processed the same way as regular email-to-PDF conversion. Office documents are converted to PDF, images and existing PDFs are included directly. All attachments are merged with the email body into a single PDF per email.

If your OST file is too large, consider compressing it through ZIP. This is really simple. Just go to your file library, right-mouse click on your file and select ‘compress in ZIP-file’. Your file size can be greatly reduced, and you can still use the ZIP file on PDFen

OST files are typically located in your Outlook data folder. On Windows, this is usually at C:\Users[username]\AppData\Local\Microsoft\Outlook. The file name often includes your email address. You can also find the location in Outlook under File > Account Settings > Data Files.

Processing time depends on the number of emails and attachments in your OST file. OST files are often larger than PST files due to mailbox caching. A typical archive with 50 emails takes 2-5 minutes. Larger archives may take longer.

Converting a file to PDF ensures your document stays consistent and accessible. PDFs lock in formatting, design, and structure, preventing layout shifts that can happen with editable file types. They’re compatible with virtually all devices and operating systems, making them ideal for professional documents, forms, reports, and presentations. PDFs are also easy to distribute; whether through email, downloads, cloud platforms, or QR-codes that let users open a file instantly on their phone.

Our intelligent software minimizes quality loss when converting documents. As such, documents can be converted without having to worry about quality loss for a great number of times.

No; our intelligent PDF software recognizes document layouts and transforms them accurately onto a new file format. Was your lay-out or format not transformed accurately? Consider applying OCR, or applying different customization settings to convert it correctly.

Yes! There are no limits to converting documents, and documents can safely and easily be converted back and forth. Conversion can be handy to edit a PDF document in Word, and later convert it back into an organized PDF format.

To merge PDF documents simply go to our converter, choose the file format you’re merging, and drag and drop the files you want to merge. Then you have the opportunity to edit some settings, press merge, and you’re done! You can download your merged file right away.

Yes, PDFengine offers various means of customizing your (PDF) documents. Consider adding a cover page, applying OCR, or using PDF/A as output.

If the text is not copyable, clickable, or searchable, that means the text is not recognized within the PDF. Try uploading your document onto PDFen and applying OCR. OCR technology will make your text readable. In case it doesn’t work completely in one go: apply OCR a second time.