some journals ask to add graphical abstract i tried to do that in website, but after i did it the resolution was not high and they ask to pay for high resolution, can anyone advice me to find free program or website for graphical abstract??
Inkscape, Adobe Illustrator & PowerPoint are good for high resolution graphical abstracts. Inkscape is the free software. Here are some graphical abstract tutorials for scientists on my channel DrawBioMed. https://www.youtube.com/channel/UCaj-dnHpfViQRv9-vQFl4Jw. If you have specific questions about certain structures, welcome to ask me in the comment section.
The graphical abstracts are used in article to make the readers interest and clear understanding. You may try this to draw your graphical images. Graphical abstract drawing at very low cost (Starting price: 35 USD for 2D image) use the link: https://www.facebook.com/grapicmaster/ All you have to do is send a pencil drawing of your concept to be illustrated to them they will draw accordingly. Once drawn the graphical image of your illustration you can see the image and pay for it. It is very flexible and precise.