Signature images go wrong in two predictable ways: too large in bytes, or too large on screen. Both are easy to avoid.
Choose a logo width appropriate to the email layout and preserve its proportions. Save and insert the image using your mail application's signature settings, then test a message to a recipient. This tool does not generate an email signature template.
Locked resizing keeps each image's proportions. Fixed dimensions can stretch images; crop to the required ratio first.
The encoder creates a new file. Upscaling cannot recover detail that the original did not contain.
A logo in a signature is normally between 150 and 300 pixels wide. For a sharp result on high density screens, make the file twice the size it will be shown at and set that size in the signature itself. Then run it through Compress image so the file is small, ideally well under 50 KB.
Many mail programs block images by default, so the signature should still make sense without the picture. Keep the logo simple, and keep a PNG if it has a transparent background.
No. Check dimensions here, then use Compress to a size if the destination separately limits file size.
A PDF that needs a password to open must be unlocked first with Protect PDF. For a very long document the thumbnails can take a moment, and you can still type the page numbers yourself.
Between 150 and 300 pixels wide as displayed. Make the file about twice that for sharp results on high density screens.