CloudConvert
cloudconvert.com
Converts between around 200 file formats, including the awkward ones
Free tier
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pandoc.org
Converts between Markdown, LaTeX, DocBook, reStructuredText and dozens more.
The official playground for Pandoc, the document converter that academic publishing quietly runs on: paste text on the left, choose input and output markups, read the converted result on the right. It is the quickest way to see exactly how a Markdown table becomes LaTeX, or what your reStructuredText looks like as DocBook, without installing a toolchain. It is a demo of the engine, not a file service.
AltFTool does this too
If you would rather not leave the site, Markdown / HTML Converter covers the same job here — free, no account, and it runs in your browser.
Open Markdown / HTML ConverterQuestions
Works the moment the page loads. No account, no email, no trial. It only converts pasted text — no file upload, no images and no PDF output.
Yes. Try Pandoc sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
It only converts pasted text — no file upload, no images and no PDF output.
Alternatives
Same category or same task, ordered by how closely they overlap.
cloudconvert.com
Converts between around 200 file formats, including the awkward ones
convert.town
A pile of one-click converters that never upload the file
convertio.co
Drag a file in, pick an output format, download the result
svgco.de
Traces a PNG or JPEG into a scalable SVG inside the browser
vert.sh
Open-source converter that handles images, audio and documents on your device
zamzar.com
The email-me-the-converted-file service from 2006, still converting