Convert S/MIME to WebP
Convert S/MIME to WebP online: the signed email laid out with its headers and body, saved as a compact WebP image. Free, no sign-up.
Drop your S/MIME files here
Up to 50MB per file.
Conversion Settings
Files are encrypted and auto-deleted after conversion
How to Convert
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Upload your S/MIME files
Drag and drop or select S/MIME files from your device. You can upload multiple files at once.
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Configure Output
Choose any available WebP output options, then start the conversion.
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Download WebP files
Once conversion finishes, download your files individually or as a compressed ZIP archive.
Why convert S/MIME to WebP?
S/MIME files hold an email secured with a digital signature or certificate, as sent by Outlook, Apple Mail and other clients that use S/MIME. The image shows the From, To, Cc, Subject and Date of the message, its body, and a list of attached parts by name and type.
WebP stores the rendered image in a modern, efficient format, so the file is noticeably smaller than an equivalent PNG or JPG.
Frequently Asked Questions
How do I convert S/MIME to WebP?
Drop your S/MIME file above and press Convert. Our servers read the signed message, lay out its headers and body, and render the page. The result is saved as a compact WebP image, ready to download.
Can a signed S/MIME email be converted to WebP without the sender's certificate?
Yes. The message is read as it was received, so its headers and body are laid out with no certificate or key needed.
Are the Cc recipients of an S/MIME email included in the WebP?
Yes. When the message was copied to others, a Cc row lists them beneath the From and To rows in the header table.
What happens when a S/MIME file fills several WebP pages?
Each page is rendered at 144 dpi and saved as its own WebP image, named page-1, page-2 and so on, and they download together as one ZIP. A single page downloads as one WebP file.
How much smaller is the WebP from a S/MIME file?
WebP typically produces files around a quarter to a third smaller than JPG at similar visual quality, and far smaller than PNG, while text and lines stay clear.
Is my .smime 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.