You can open a file for performant access in all major browsers. It's the same API used for uploading files (<input type="file" />), but you can also just load them into memory and do stuff.

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fooker a day ago | parent [-]

Sure, with the caveat that the file is specifically selected by the user.

	▲	phatskat 8 hours ago \| parent \| next [-]
		Which sounds ideal for this scenario, right?
	▲	baobun 16 hours ago \| parent \| prev [-]
		I read that as the ask, yes.