CloudConvert
cloudconvert.com
Converts between around 200 file formats, including the awkward ones
Free tier
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convertio.co
Drag a file in, pick an output format, download the result.
A plain, fast converter with a very wide format list and — unusually for a free tool — built-in OCR, so a scanned PDF can come out as editable text rather than a picture of text. There is no account step and no queue for small files. Everything is uploaded to their servers and deleted after 24 hours, which is fine for a slide deck and wrong for a payslip.
Questions
A genuinely usable free tier with paid plans for volume or team features. Free uploads are capped at 100 MB per file and the free plan limits how many conversions you can run in a day.
Yes. Convertio 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.
Free uploads are capped at 100 MB per file and the free plan limits how many conversions you can run in a day.
Alternatives
Same category or same task, ordered by how closely they overlap.
cloudconvert.com
Converts between around 200 file formats, including the awkward ones
zamzar.com
The email-me-the-converted-file service from 2006, still converting
convert.town
A pile of one-click converters that never upload the file
ebook.online-convert.com
Turns EPUB, MOBI, AZW3 and PDF into whatever your e-reader actually opens
pandoc.org
Converts between Markdown, LaTeX, DocBook, reStructuredText and dozens more
svgco.de
Traces a PNG or JPEG into a scalable SVG inside the browser