About SociaResize

SociaResize is a free, fast browser tool for resizing images for social media posts. Images are never uploaded to a server — all processing happens in your browser.

Privacy

Images are never sent to a server. All processing runs in your browser.

Fast Processing

Fast image processing with WebAssembly and Web Workers. Never blocks the main thread.

Japan SNS Support

Covers LINE, Threads, Bluesky and other platforms popular in Japan that other tools miss.