They are closely related. Extracting saves your chosen pages as one new file, while splitting can break a PDF into several files at once.
Yes. Extract PDF Page is completely free with no sign-up, no watermarks and no usage limits.
No. Extract PDF Page runs entirely in your browser, so your data never leaves your device.
Only your device's available memory — there are no server-side limits because nothing is uploaded.
Pull selected pages out of a PDF and save them as a new document.