We would like to explain what you are seeing or what you may see when exporting images from VSCO.
There are a number of different words to describe an image: file size, resolution and image quality to name a few.
Typically, file size is not the same as image resolution or image quality.
Standard compression from Apple and Android's image processing that VSCO relies will apply a slight compression to the image, which will reduce the file size of the exported image. This could happen regardless of whether or not a preset or edit is applied to the image.
The resolution of the image will remain the same: If you import an image with dimensions of 3,000 x 5,000 pixels, the same resolution will be exported from VSCO if you choose ‘actual size’ export option in iOS and standard export on Android.