.svg is a vector based data format. You dont have to/you cant resize them. Its just an xml file where the path is described.
This is a heart with an heartbeat in it. Its just 1.7 KB and can be skaled as big as you want to.
Code:
<path xmlns="http://www.w3.org/2000/svg" style="fill:#39AB47;" d="M32.875,0c-3.0830078,0-5.8964844,1.1914063-8.0703125,3.1542969 C22.6328125,1.1914063,19.8173828,0,16.7353516,0C9.8681641,0,4.2998047,5.8847656,4.2998047,13.144043 c0,2.6826172,0.7646484,5.284668,1.9912109,7.7397461h4.1572266l2.7128906-7.4790039 c0.2207031-0.6083984,0.8017578-1.0097656,1.4541016-0.987793c0.6474609,0.019043,1.2089844,0.4511719,1.3935547,1.0717773 l3.1259766,10.5014648l4.3271484-17.1328125c0.1640625-0.6499023,0.7392578-1.1123047,1.4091797-1.1323242 c0.7089844-0.0327148,1.2724609,0.4072266,1.4746094,1.0458984l4.4765625,14.112793H36.5c0.828125,0,1.5,0.671875,1.5,1.5 s-0.671875,1.5-1.5,1.5h-6.7753906c-0.6533203,0-1.2324219-0.4238281-1.4296875-1.046875l-3.2148438-10.1347656 l-4.3720703,17.1796875c-0.1650391,0.6542969-0.7470703,1.0019531-1.4228516,1.0019531c-0.0107422,0-0.0205078,0-0.03125,0 c-0.6621094,0-1.2480469-0.3027344-1.4375-0.9414063l-3.3857422-11.3056641l-1.5205078,4.2255859 c-0.2148438,0.59375-0.7792969,1.0214844-1.4101563,1.0214844H8.0566406H1.5c-0.828125,0-1.5,0.671875-1.5,1.5s0.671875,1.5,1.5,1.5 h8.8427734c6.046875,7.1474609,14.4619141,11.9951172,14.4619141,11.9951172S45.3115234,27.0839844,45.3115234,13.144043 C45.3115234,5.8847656,39.7431641,0,32.875,0z"/>
You just set the size with css or in the html tag.
Vector based grafics giving us fast sitereloads and the ability to display sharp icons for every solution.
