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Quick answers before you write
Most tools have no hard limit because they run on your device - the practical ceiling is your device's memory. There are no daily task quotas anywhere. The few server-processed converters handle typical documents easily.
No. Browser-based tools never upload your files at all. The few tools that need server processing encrypt the transfer and delete files within one hour. Each tool page states which type it is.
Yes - commercial use is fine at no cost. You keep all rights to your files; the Terms of Service spell out the details.
The tool name, your browser and device, and what you expected versus what happened. A screenshot or the file type involved helps us reproduce it much faster.