Convert Town
convert.town
A pile of one-click converters that never upload the file
No sign-upOn device
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rapidtables.com
Unit, number-base and colour conversions with the formula written underneath.
A reference site rather than an app: hundreds of small conversion pages for units, number bases, colour codes, electrical maths and text encodings, each showing the formula and a worked example below the calculator. It loads instantly on a bad connection and works on a phone, which is why it keeps outranking prettier tools. The maths runs in the page, so nothing you type is sent anywhere.
AltFTool does this too
If you would rather not leave the site, Unit Converter covers the same job here — free, no account, and it runs in your browser.
Open Unit ConverterQuestions
Works the moment the page loads. No account, no email, no trial. Ad-dense and visually stuck in 2011, and some reference tables have not been revised in years.
No. RapidTables does the work inside your browser, so the file never leaves your device — you can load the page, disconnect from the network, and it still works. That makes it a reasonable choice for material containing personal data.
Ad-dense and visually stuck in 2011, and some reference tables have not been revised in years.
Alternatives
Same category or same task, ordered by how closely they overlap.
convert.town
A pile of one-click converters that never upload the file
ezyzip.com
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svgco.de
Traces a PNG or JPEG into a scalable SVG inside the browser
tinywow.com
A couple of hundred small file tools, free and with no account
transfonter.org
Turns a TTF or OTF into WOFF2 with the @font-face CSS written for you
pandoc.org
Converts between Markdown, LaTeX, DocBook, reStructuredText and dozens more