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File Converters
Open tool DOCX to Markdown
Convert DOCX into Markdown locally, with explicit format controls, bounded validation, a reviewable preview when practical, and a separately named download.
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File Converters
Open tool DOCX to ODT
Convert DOCX into ODT locally, with explicit format controls, bounded validation, a reviewable preview when practical, and a separately named download.
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File Converters
Open tool DOCX to RTF
Convert DOCX into RTF locally, with explicit format controls, bounded validation, a reviewable preview when practical, and a separately named download.
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File Converters
Open tool DOCX to TXT
Extract the main body of an unencrypted DOCX into a separate UTF-8 plain-text file.
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Physics
Open tool Doppler Effect Calculator
Calculate doppler effect with guided inputs, visible equations, substituted working, and model assumptions.
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Physics
Open tool Doppler Moving Source Observer Calculator
Calculate doppler moving source observer with guided inputs, visible equations, substituted working, and model assumptions.
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Physics
Open tool Double-Slit Fringe Spacing Calculator
Estimate adjacent double-slit fringe spacing under the small-angle approximation.
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Math, Statistics & Probability
Open tool Doubling Time From Rate Calculator
Calculate doubling time from rate with guided inputs, visible equations, substituted working, and model assumptions.
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Calculators
Open tool Down Payment Calculator
Calculate the cash contribution represented by a selected purchase-price percentage.
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Downloaders & Public Media
Open tool Download Filename Sanitizer
Prepare a browser-safe public-media workflow for download filename sanitizer with visible permission and privacy boundaries.
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Downloaders & Public Media
Open tool Download Header Builder
Prepare a browser-safe public-media workflow for download header builder with visible permission and privacy boundaries.
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Calculators
Open tool Download Time Calculator
Create a bounded, browser-local download time calculator with visible assumptions, review guidance, and downloadable output.