Yes. There is no daily limit, no file size limit, no watermark and no sign-up. It is free because your own device does the converting, so it costs us almost nothing.
Are my files uploaded?
No. Files are converted inside your browser and never leave your device.
What can it convert?
262 conversions between photos (including iPhone HEIC), PDF, video, music and spreadsheets, plus text reading (OCR) from pictures and scanned PDFs.