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Focus in work/break intervals with a session counter. Free, runs entirely in your browser — no signup, and nothing you paste in is uploaded.
The technique's value is less the timer than the commitment: for one interval, one task, and interruptions get written down rather than followed. The break is not optional either — it is what makes the next interval possible, and skipping it turns the method into ordinary uninterrupted work with extra ceremony.
Twenty-five minutes is a starting point rather than a law. Work that takes a long time to load into your head can justify a longer interval; the useful discipline is choosing the length before starting, so that stopping is a decision you already made rather than one you take while distracted.