Main features of the program:

Extracting frames from video files
The program is able to extract a specified number of frames from AVI, MPG, VOB, WMV, MKV, etc. video files. Support for certain formats depends on the codecs installed in the DirectShow system. It is recommended to use the K-lite Codec Pack.
It is possible to compose frames into one image or upload them to the server separately.
Screenshot
The program can take screenshots of the entire screen or the active window, or the area of the screen selected with the mouse (the "Quick Shot" button)
Drag-n-Drop and clipboard support
Just drag a video file or images to the main window from Explorer or another file manager, and the program will be able to process them.
Pasting images from the clipboard is also supported.

For those who did not know:

You can draw on the screenshot with the right mouse button.
To draw a vertical or horizontal line, hold Shift. To change the color of the line, press the middle mouse button. To decrease or increase the line width, press the "[" and "]" keys (as in Adobe Photoshop).
To remove an image from the list, you can click the middle mouse button.

Portable Features:

Portable versions are provided by the developer, do not require installation.
The openssl version is built with the OpenSSL backend for libcurl. Use this package if you have problems with HTTPS connections, especially if you are using Windows XP or Wine.
The portable versions have 2 empty folders, so the portable versions are included in the distribution in an unpacked (author's) form.

Изменения:

https://raw.githubusercontent.com/zenden2k/image-uploader/master/changelog_ru.txt