For Mac
When we firstly begin to use it, we should click "Add Files" to add the files we need. Then choose the output format, after that you can see the setting icon, click it and you can choose the picture quality, color, play speed, size. Different formats have different kinds of settings. Also, if you want to apply all the output formats, just click "Apply to All". At the same time, you can choose the output folder below the output format. At last, you can click "Convert" button to begin converting. Before converting, you can choose the folder in which you want to save your files. Click "Output Folder" and choose it and open it.
Select the page you want to convert for the selected file: All Pages and your self-defined page(s). You can enter page numbers or page ranges separated by commas in the "Range" option.
Select target output format from the "Output Format" column at the bottom of the main interface, or just choose the option from the "Output Format" drop-down list in line with the source file in the loaded file list.
To output different formats, please choose separate format respectively for each selected source file; to output the same format, please choose target format for a selected source file, then click "Apply to All" button in line with "Output Format" column to apply current format to all other source files.