How to convert images in bulk (JPG, PNG, WebP) on Windows
Short answer
Windows has no built-in way to convert a folder of images to another format in one go. You can convert them one by one in Paint, or use a batch tool. AppRig converts whole folders between JPG, PNG, WebP, BMP, GIF, TIFF, TGA and QOI at once, with optional resizing, quality control, and presets for common social sizes.
The manual way
Windows does not ship a bulk image converter. To change a file’s format, you open it in Paint or the Photos app and use Save as (or export) to pick a new format. It gets the job done for a single image.
The problem is scale. Each image has to be opened, converted, and saved individually, with no resizing presets and no batch option. Converting a whole folder this way, say a camera roll or a set of exported assets, quickly turns into a repetitive slog rather than a quick task.
The faster way with AppRig
AppRig’s Convert sub-tool takes an entire folder, or files dropped straight onto it, and converts them all at once between JPG, PNG, WebP, BMP, GIF, TIFF, TGA and QOI. You set the output quality, an optional lossless mode, and resize by fit, exact dimensions, or percentage, with presets already set up for common social media sizes.
Auto-rename keeps converted files from overwriting the originals, and a batch run is cancellable partway through, with per-file progress so you can see exactly where it is up to. What would be dozens of manual save-as dialogs becomes one pass over the whole folder.
See the full AppRig how-to in the docs →
Related questions
AppRig does this and more, all in one local-first Windows app. See what AppRig does →