If you want a free image compressor that does not upload your pictures, use a browser-based compressor instead of TinyPNG. TinyPNG sends images to its servers to shrink them, while a client-side tool re-encodes the photo on your own device, with no account and no monthly file cap.
TinyPNG is a well-known image compressor that works by uploading your PNG or JPEG to its servers, compressing it there, and sending it back. That is convenient, but it means your image leaves your device and its free use is metered. A browser-based compressor does the same core job, re-encoding the image, but keeps everything local.
Local compression is the better fit when the image is private, when you are compressing many files and do not want to hit a monthly limit, or when you simply prefer that nothing is uploaded. You control the quality level and can compress as many images as you like.
Yes. There is no account, no monthly compression cap, and no watermark.
TinyPNG uploads your image to its servers; this tool compresses it in your browser so nothing is uploaded.
Yes. Common web image formats work directly in the browser.