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A corrupted PST file can feel like losing years of work overnight — missing emails, broken contacts, calendars that won’t load. If Outlook is throwing errors and Microsoft’s built-in ScanPST utility hasn’t fixed it, an online PST repair tool is often the fastest way to get your mailbox back without installing anything.
We tested and reviewed the top online PST repair services based on ease of use, file size limits, data recovery accuracy, pricing, and privacy handling. Here are the three best options worth trying in 2026.
Here’s the Best 3 Online PST Repair Tools
1. Stellar Online PST Repair
Stellar online PST repair is a browser-based repair tool tops the list for a reason: it’s transparent about pricing, doesn’t require Outlook installed, and processes most files in around 15 minutes.
Key features:
- Free repair for PST files up to 500 MB, no credit card required
- Recovers emails, attachments, contacts, calendars, notes, and journal entries
- Lets you preview the folder structure and item counts before downloading
- Works with password-protected PST files without extra steps
- Supports Outlook versions from 2003 through 2021, in both ANSI and Unicode formats
- Files are automatically deleted after 24–48 hours for privacy
Pricing: Free up to 500 MB. Files between 500 MB and 5 GB cost $29.99 per file on the Premium plan. For unlimited file sizes, a $79.99 desktop Professional Edition is available that repairs files locally instead of uploading them.
Best for: Users with a single corrupted PST file under 500 MB who want a completely free, no-install fix — and anyone who wants to preview recovered data before committing.
2. Recovery Toolbox for Outlook
Recovery Toolbox for Outlook online offers one of the simplest workflows of any online PST repair service. There’s no account creation — just upload, verify, and go.
How it works:
- Select your corrupted .pst or .ost file
- Enter your email address to receive the recovered file
- Complete a quick captcha
- Submit the file for automated repair
- Download the recovered mailbox once processing finishes
The recovered data is rebuilt as a new Outlook 2016-compatible .pst file in Unicode format, which makes it easy to reopen in any modern version of Outlook. Because it runs entirely in the browser, it works on virtually any device without needing Outlook pre-installed.
Best for: Users who want a fast, minimal-step repair process without digging through pricing tiers or dashboards up front. Just know that pricing and detailed limits aren’t listed on the landing page, so you’ll want to confirm cost before uploading sensitive data.
3. PST Repair Kit
Unlike the first two, PST Repair Kit is primarily a downloadable Windows tool, though it also offers a $10 online repair option for smaller jobs. It’s built for power users and IT professionals dealing with heavily corrupted or oversized mailboxes.
Key features:
- Recovers PST and OST files from Outlook versions 97 through 2019
- Handles files larger than 2 GB, including severely corrupted ones that other tools can’t touch
- Converts OST files to PST format
- Extracts data into individual .MSG, .EML, or .VCF files if a full PST rebuild isn’t needed
- Fixes errors caused by a failed scanpst.exe repair attempt
- Recovers from password-protected and encrypted files
- Full compatibility with legacy systems (Windows 98 through Windows 10)
Pricing: Desktop licenses run $49.90, $74.90, or $200 depending on the tier, with a lighter-weight $10 online repair option for quick jobs.
Best for: Users with large mailboxes (2 GB+), severely corrupted files that ScanPST and lighter online tools couldn’t fix, or anyone who prefers processing files locally rather than uploading them to a server.
Quick Comparison: Best Online PST Repair Tools
| Tool | Best For | Free Tier | Max File Size | Turnaround |
| Stellar Online PST Repair | Overall best free option | Up to 500 MB | 5 GB (paid) | ~15 minutes |
| Recovery Toolbox for Outlook Online | Quick, no-frills recovery | Limited preview | Not specified | Varies |
| PST Repair Kit | Large/severely corrupted files | Trial preview only | 2 GB+ | Minutes to hours |
How to Choose the Right PST Repair Tool
- File size matters most. If your PST is under 500 MB, start with Stellar’s free tier before paying for anything.
- Privacy is a real consideration. All three services require uploading your mailbox — which likely contains sensitive personal or business correspondence — to a third-party server. If privacy is a top concern, a locally-processed desktop tool (like PST Repair Kit’s desktop edition or Stellar’s Professional Edition) keeps your data off external servers entirely.
- Try ScanPST.exe first. Before paying for any tool, run Microsoft’s free built-in Inbox Repair Tool (scanpst.exe), included with every Outlook installation. It resolves a large share of minor corruption issues at no cost. Online tools are best reserved for cases where ScanPST fails or the corruption is too severe.
- Check turnaround expectations. If you need your mailbox back urgently, Stellar’s stated ~15-minute repair window is currently the most predictable of the three.
Final Verdict
For most users, Stellar Online PST Repair is the best starting point thanks to its free tier, clear pricing, and preview feature. If you want the fastest, simplest upload-and-download experience, Recovery Toolbox for Outlook Online gets the job done with minimal friction. And if you’re dealing with a large or badly damaged mailbox that other tools can’t fix, PST Repair Kit offers the deepest recovery capabilities — especially through its desktop edition.
Whichever tool you choose, always back up your original PST file before attempting any repair, and consider running Microsoft’s free ScanPST utility first.
Frequently Asked Questions
Not always. Severity of corruption, file size, and the underlying cause (disk errors, malware, abrupt shutdowns) all affect recovery odds. Tools like PST Repair Kit are built specifically to handle cases where lighter tools fail.
Reputable services like Stellar state that files are processed in automated environments and deleted within 24–48 hours. Still, if your mailbox contains highly sensitive data, a local desktop repair tool avoids the upload step entirely.
No, all three online services work directly in your browser without requiring Outlook. Note that to open the repaired PST file afterward, you will need Outlook installed.
PST files are local Outlook data files; OST files sync with a mail server (like Exchange or Microsoft 365). All three tools listed here can handle OST files as well, including converting OST to PST format.
