Should I watermark my photos taken with my mobile before posting it online?
It is a personal opinion.
I would suggest you to watermark them strictly. If not now, when the Internet is going to be taken up by Mobile Photography, you'll find that all the photos you posted are free for others to manipulate them. If you will be sharing your landscape, or travel, or food photographs on your blog, website, social-photography platforms, it is better you watermark them.
I would not suggest to watermark photos for Instagram because the size it allows to be visible.
Note: These are for photographers or aspiring photographers and not for selfie lovers et all.
How do I watermark my photos?
Know a bit about Snapseed app:
Snapseed is a complete and professional photo editor developed by Google.
• 26 tools and filters, including: Healing, Brush, Structure, HDR, Transform (see list below)
• Opens JPG and RAW files
• Use the stack to re-adjust edits later
• Selective filter brush
• All styles can be tweaked with fine, precise control
• Insights feature with tips and tricks about Snapseed and general photography
After installing the app on your mobile, tap the icon to launch it.
Tap anywhere and your Gallery opens.
You can either take a photo and start editing or choose one from your mobile phone.
Tap the Pen icon, and then tap Text to start adding a text on your photo.
Double-tap to change the text.
Type the text you would like to add as a Watermark on your photo and tap OK.
Change the colour of your watermark.
Change the opacity of your watermark.
Change the style of your text, and tap the Tick icon to apply.
Tap Save, and tap Export to save a copy of the photo with the watermark on it.
You'll find the photo in your Camera Roll or Gallery.