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Technically you can embed up to ~10 KB of binary data in a certificate extension without breaking most parsers. Larger images (e.g., > 100 KB) may cause compatibility issues; consider a tiny PNG or compressed JPEG (≤ 5 KB) for best results.
A JPG to PFX converter is a tool that allows you to convert an image file in JPG format to a PFX file. This conversion is often necessary when you need to embed an image, such as a logo or a signature, into a digital certificate or a private key. jpg to pfx converter online free upd new