Compress, convert, resize and clean up images, all in your browser. All 9 tools below run locally in your browser. Nothing is uploaded.
Images are the case where "runs in your browser" stops being a privacy preference and becomes a practical one. A screenshot of a dashboard, a photo of a document, a design mock under NDA: none of it should need a round trip to someone else's server to be made 200 pixels narrower.
These run on your own machine: compressing a photo to fit an upload limit, converting between JPG, PNG and WebP, turning iPhone HEIC photos into JPG, removing the location and camera data a phone writes into every picture, resizing, adding margins, drawing a signature, and pulling a color palette out of an image.
Whatever your browser can hold. Processing happens on canvas in local memory, so the ceiling is your own machine rather than an upload limit. Multi-megapixel photos are comfortable on a desktop and more constrained on an older phone.
Scaling down is clean. Scaling up cannot invent detail that was never captured, so it softens. For JPEG and WebP output you can also set the quality level and watch the result before saving.
PNG, JPEG and WebP. PNG keeps transparency; JPEG does not, so a transparent margin is flattened to white when you export as JPEG.