With the converter you can change the size of your PNG images online or via e-mail.
Protect your data – go to the encrypted site: https://www.konwerter.net/en/graphics/
Alternatively, you can convert your files via e-mail. Read more.
Click in the link: png resize or perform the following steps:
1. Create a new message and address it to: firstname.lastname@example.org
2. Enter the subject: png widthxheight
3. Add one or many attachments
4. Send the message
png 200x100 png 256x256 png 640x480 zip
If you need more security, use PGP encryption http://www.konwerter.net/pgp-encryption/