When you do not have any installed software for editing your photos, Picnik is a good solution. Picnik is a free online tool for editing photos. With Picnik, you can get photos from computer, Picasa, Flickr, Photobucket, Myspace, Facebook or from web cam and then edit them online.
Once you add the photo to Picnik, you can start editing, renaming, email to friends and save it back to web albums.
In the edit mode, there are options to Rotate, crop, Resize, fix exposure, change colors, sharpen image and red eye removal. You can also undo any changes made to the image.
There is also a Create menu where there are options to add effects to images. Other features include adding text, shapes and frames to images.
Once you are done with editing, you can use the “Save & Share” and you can take your edited photo and save it back to Picasa or Flickr web albums, email the photo to someone, save it to your computer or even create a Flickr slideshow.
Picnik is a great website for editing photos especially for its integration with photo sharing and social networking sites.