If you prefer no‑web at all, the following OpenSSL one‑liner embeds the JPEG as a custom extension and packs everything into a PKCS#12 bundle.
# 1️⃣ Convert the JPEG into a DER‑encoded OCTET STRING (Base64 is fine)
openssl asn1parse -inform DER -in <(openssl enc -base64 -d -in logo.jpg) -out logo.der
# 2️⃣ Create a custom extension file (logo.conf)
cat >logo.conf <<EOF
[ extensions ]
1.2.3.4.5 = critical,DER:logo.der
EOF
# 3️⃣ Generate a self‑signed cert that includes the image
openssl req -new -x509 -key mykey.key -out mycert.crt -days 365 \
-subj "/C=US/ST=NY/L=NYC/O=Acme Corp/OU=IT/CN=acme.com" \
-extensions extensions -config <(cat /etc/ssl/openssl.cnf logo.conf)
# 4️⃣ Package into a PFX
openssl pkcs12 -export -inkey mykey.key -in mycert.crt \
-out mybundle.pfx -password pass:SuperStrongPass123
Explanation
Several websites allow you to upload an image, generate a certificate on the fly, and download a PFX or digital ID. jpg to pfx converter online free upd new
Tool 2: Create Your Own Certificate (Open Source Tools) If you prefer no‑web at all, the following
While a JPG is typically an image file and a PFX is a security certificate (Personal Information Exchange), this tool allows you to embed image data into a certificate format or generate a certificate based on image input for specific proprietary uses. Explanation