Open a molecule file
Chemical files
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Choose File > Open...
on the menu bar or use Ctrl+O shortkey. -
Select the name and the location of the chemical file you want to load.
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Click Open.
Open function overwrites the canvas, discards any unsaved sketches.
The File > Insert file menu option which works in the same way as the Open dialog loads the content while conserving the content of the canvas.
If the Show preview checkbox is enabled, the content of the file (molecules, reactions, queries) is shown in the preview window.
When a multiple structure file is selected (e.g., MRV , SDF), the navigation buttons become active. Their functions are: 
go to first, 
go to previous, 
go to next, 
go to last.
The preview window allows you to check the content of the file (not to select the invidual structures you want to open.
If you want to open only a subset of structures write their serial numbers separated either by commas or by a dash in Select text box. Clicking on the Info 
button presents tips for specifying the desired molecules.
MarvinSketch allows you to have up to 100 structure to be opened at once.
Image files
Importing structures from image files or pasting them from the clipboard with the help of OSRA is also possible (since version 5.3.0).
Select File > Import Image if you want to open an image file. The supported formats are: BMP, PNG, JPG, GIF, SVG, and TIF.
Alternatively, the File > Open... menu option can also be used for opening an image file. Select All Files from the list of Files of Type.
Pdf files
Marvin enables open pdf files containing chemical names via Document to Structure (d2s) conversion.
If your PDF file contains images of compounds, you need OSRA to be installed on your computer in order to import the structures into Marvin. Please consult this page for details .
You can also Paste existing structures from other windows, as well as Drag & Drop a chemical structure into the MarvinSketch window. Both actions add the new structure to the canvas without overwriting it.