nanofile

People who need to shrink or convert files, such as a photo for an email attachment, a scanned PDF, or a font for the web, typically rely on online converters that require uploading the file to a remote server. This raises privacy concerns since the file leaves the user's device, and it can be slow or limited by upload size caps that many mail providers and web tools enforce (often 20 to 25MB). Users are also often stuck guessing at a quality slider rather than specifying a target file size, and mixed batches of file formats have no single tool that handles all of them at once.

nanofile is a free online compressor and converter that runs entirely inside the user's browser tab, reading files by extension and file signature so a mislabelled file still routes correctly. It covers 36 formats across images, documents, vector, code, audio, archives, fonts, ebooks and 3D, each with a stated typical compression range, and lets users type a target size in MB or KB instead of guessing at a slider. It also offers format conversion (image, PDF, font and audio pairs) and a Create ZIP tool for packing mixed or unsupported formats. Because there is no upload endpoint, the site claims compression works even with the network disconnected after the page loads, and results are shown via a before-and-after preview divider so users can judge quality themselves.