CloudConvert
cloudconvert.com
Converts between around 200 file formats, including the awkward ones
Free tier
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Turn one file type into another without installing anything.
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
ezyzip.com
Opens and builds ZIP, RAR and 7z archives without uploading them
fileinfo.com
Tells you what a mystery file extension is and what opens it
ebook.online-convert.com
Turns EPUB, MOBI, AZW3 and PDF into whatever your e-reader actually opens
rapidtables.com
Unit, number-base and colour conversions with the formula written underneath
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
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
Privacy
These process everything inside the browser. Load the page, disconnect from the network, and they still work.
convert.town
A pile of one-click converters that never upload the file
ezyzip.com
Opens and builds ZIP, RAR and 7z archives without uploading them
rapidtables.com
Unit, number-base and colour conversions with the formula written underneath
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
By task
Questions
There is no single answer, which is why this page lists 13 of them with their limits stated. If you want to avoid signing up entirely, 9 of these work with no account at all.
5 of the 13 sites here process your file inside the browser and never upload it — they are marked "On device". The rest send your input to their server, which is fine for public material and worth thinking twice about for anything personal.
Nothing in this category has shut down so far. When something does, it moves to the Archive with a named successor rather than being deleted, so the answer to "what replaced it" survives.