Converting OST file to PST online is not a good idea. Here is why so.
Converting OST file to PST Online
Trying online web-based tools for most tasks is appealing. Most of such applications are free and even if they are not, it is always an attractive choice to work directly on your browser instead of installing a third-party tool.
While that is convenient and even advisable in certain scenarios, it is not always the most proficient and adaptive way of doing things. For instance, if you need to add text to an image, you are probably better off just doing it online rather than going all the way and buying dedicated programs like Photoshop.
However, we infer that a lot of readers for this post already use a dedicated program in place of a web-based one. And that is Outlook. (that is why you are reading converting OST file to PST online, which are Outlook data files).
Just like Outlook, a dedicated desktop-based email client for Windows PC, is far better than a web-based interface, like Gmail has. There is not even a comparison in terms of functionality and productivity you can get with a dedicated software.
Naturally, it’s the same for email migration.
The Challenges
If you want for converting OST file to PST online, firstly, you may find it too hard to even find such a web-based solution. Secondly, why go all that way only to end up with partial results and highly imprecise data output. With most online based converters, you will get fragmented data. Most likely: you images, format of your email text, organization of the folders, headers, and even some text characters, especially if they are other than ASCII encoded.
It certainly makes sense to go with a dedicated, desktop-based, fully professional OST to PST converter. It may look like you need to install a third-party application and may even cost you, but by the end, you can see for yourself why they are heavily recommended over any other methods, especially the online-based tools.
Although, depending on the third-party file converter you choose to convert your files, this option can too offer low returns. Many apps for converting OST files to PST have not cracked the code for maintaining the integrity of the database. These tools are often crushed in the face of more complex and heavy databases that you are likely to get in a business-related data.
Best App For Converting OST file
The good news is, there is an app that will take you home quickly and seamlessly. It works like a charm in any scenario and has a basic interface that will please even the least tech savy user.
Called “OST Extractor Pro,” (from USL Software) the converter has all the essentials that an online tool can never have. But also, it comes at a very economical price (and three difference licensing packages) that will even neuter the appeal of a free online tools.

Get it for converting OST file to PST offline
You can download a trial version first to see it all in action.
In conclusion, converting OST file to PST online is not recommended for anyone. That is, if you can even find one. Virtually all the available methods and tools are desktop-based, dedicated tools that you need to install from third-parties.
USL Software has a strong hold in this domain and has gained itself a trustable label for all email migration related matters. Their tool, ‘OST Extractor Pro,’ gives you peace of mind for the task of OST to PST conversion and gets the job done in a professional style.