Convert OST to BMP
Convert OST to BMP online: cached Outlook messages laid out as readable pages, saved as an uncompressed BMP bitmap. Free, no sign-up.
Drop your OST files here
Up to 200MB per file.
Conversion Settings
Files are encrypted and auto-deleted after conversion
How to Convert
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Upload your OST files
Drag and drop or select OST files from your device. You can upload multiple files at once.
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Configure Output
Choose any available BMP output options, then start the conversion.
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Download BMP files
Once conversion finishes, download your files individually or as a compressed ZIP archive.
Why convert OST to BMP?
Outlook keeps an OST file as an offline copy of an Exchange, Microsoft 365 or Outlook.com mailbox on your computer. The image shows the body of each message from the offline mailbox, formatted text and tables included, stacked in turn beneath an “OST mailbox” heading.
BMP stores every pixel uncompressed, so the image is exact and simple to read by any software that handles Windows bitmaps.
Frequently Asked Questions
How do I convert OST to BMP?
Drop your OST file above and press Convert. Our servers read the offline data file, export its messages and render them one after another as pages. The result is saved as an uncompressed BMP bitmap, ready to download.
Can I turn an OST file into BMP without Outlook installed?
Yes. The OST file is read directly on our servers, so its cached messages are laid out and rendered without Outlook or a connection to the mail server.
Which parts of each OST message are rendered in the BMP?
Each message body is rendered with its text, formatting and tables, and the messages follow one another beneath an “OST mailbox” heading.
What happens when a OST file fills several BMP pages?
Each page is rendered at 144 dpi and saved as its own BMP image, named page-1, page-2 and so on, and they download together as one ZIP. A single page downloads as one BMP file.
What kind of BMP does the OST converter create?
A standard Windows bitmap with every pixel stored uncompressed, so the image is an exact copy of the rendered result.
Is my .ost file kept private?
Your file is uploaded over an encrypted connection, converted on our servers and deleted automatically within 24 hours. We never read, share or keep your files, and no account is needed.