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Time to be with loved ones

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Is it possible to add visible/invisible watermark to photos already uploaded to Picasa Web/500px/Flickr?

Do they preserve EXIF(metadata) of the image?

I am looking for free tools/services. If downloading software is required, I would prefer Linux/Ubuntu.

Update: In the light of two answers already given; adding a clarification. A solution that lets adding the watermark without downloading the photos from the respective locations is asked for.

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Downvoting without comment isn't helpful just rude –  Clara Onager Aug 20 '12 at 8:27
@ClaraOnager Sorry I don't get you. I can't even upvote!! –  Noble P. Abraham Aug 20 '12 at 11:30
Not you, someone else downvoted for no apparent reason –  Clara Onager Aug 20 '12 at 12:51
@ClaraOnager Ok, thank you –  Noble P. Abraham Aug 20 '12 at 12:54
What are you trying to do here? I have to admit, I can see why it was down voted as the question, given the way it was worded, would imply a less-than-savoury need here. –  John Cavan Aug 21 '12 at 3:09
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2 Answers

up vote 1 down vote accepted

Ok. I am not sure what you are asking, but I can try to guess.

If a photo is already uploaded, it is rather difficult to modify, as that copy is no longer on your computer.

I suggest downloading the photo, applying the watermark in photoshop/gimp (A free, open source version of photoshop), and re-uploading. I am not sure if this will preserve the metadata though.

As to how to apply a watermark in gimp, that is another question entirely.

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@Stephan Thanks, I am looking for a solution that might let me do it without downloading them. –  Noble P. Abraham Aug 24 '12 at 16:05
I am accepting your answer, as there may not be a better answer than this one. –  Noble P. Abraham Aug 28 '12 at 16:25
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There is a software called Mass Watermark which can watermark Images and Upload them directly to your Picasa/Flickr Web-albums.Since you have already uploaded the photos i recommend downloading them again and using the software.Download the software from http://www.masswatermark.com

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Thanks, I am looking for a solution that might let me do it without downloading them. –  Noble P. Abraham Aug 25 '12 at 8:39
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