Browse collections
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Random & lotteries
Random picker, weighted draws, dice tools, and probability calculators.
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PDF tools
Compress, merge, split, and convert PDFs in your browser.
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Loans & mortgages
Payments, schedules, affordability, and interest.
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Taxes
VAT/GST, net↔gross, and quick tax math.
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Date & time
Days between dates, business days, and time zones.
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Geometry & graph
Triangles, vectors, 2D/3D geometry, and graph tools.
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Study & classroom
Worksheets, graph paper, GPA, and learning helpers.
Tip: If you can’t find what you need, use site search or browse the tools directory.