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Brown, pink and white noise, generated in your browser and running as long as you like.
Noise does a different job from music. Instead of giving you something to listen to, it raises the sound floor so that the things you would otherwise notice — a conversation two desks away, traffic, a neighbour's television — stop standing out against silence. That is why it works for open-plan offices, shared flats, libraries and hotel rooms.
The three colours differ in how the energy is spread across frequencies. Brown is deep and soft and the least tiring over hours. Pink is balanced and sounds close to steady rain. White is bright and flat and is the most effective at covering speech.
None of this is a recording. The noise is synthesised by your browser as it plays, which means it uses no bandwidth after the page loads, never loops audibly, and can run for as long as you leave the tab open. It is released into the public domain under CC0, so you owe nobody anything for it.
If you want texture rather than a flat wash, the Nature channel synthesises rain, surf, wind and storms the same way.
Start with brown for long work sessions and sleep, white if you specifically need to cover people talking, and pink if brown feels too dull and white too harsh.
Volume is what matters, not duration. Keep it at the level where it just covers what you are trying to mask, and no louder — you should still be able to hold a conversation over it.
Essentially none. The sound is generated on your device, so nothing is streaming while it plays.