NVIDIA® GeForce® series 8 and 8M, Intel® HD Graphics 2000, Quadro FX 4800, Quadro FX 5600, AMD Radeon™ R600, Mobility Radeon™ HD 4330, Mobility FirePro™ series, Radeon™ R5 M230 or higher graphics card with up-to-date drivers
An image resizer download is software you install on your computer to change photo dimensions or file size. People use it to fit images for websites, email, social media, or to save disk space without editing every file online.
Often yes for private photos: files stay on your PC instead of being uploaded to a server. You should still download only from the official vendor or a trusted store and keep the app updated.
Common expectations are JPEG, PNG, and often WebP, TIFF, or BMP. If you need transparency, PNG or WebP matters; for photos, JPEG is typical. Check the product page before you download.
Making an image smaller usually looks fine if you use reasonable quality settings. Enlarging a small image often looks soft or pixelated because new pixels are guessed, not recovered.
Use the requirements of where the image will go: pixel width/height for web or apps, megapixels for print, and a max file size if the platform limits uploads. Many resizers offer presets or batch mode to apply the same size to many files at once.