Adobe Acrobat online
acrobat.adobe.com
Adobe's own PDF tools, free for about a job at a time
Free tier
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acrobat.adobe.com
Adobe's own PDF tools, free for about a job at a time
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
jsoncrack.com
Turns a wall of JSON into a node graph you can pan and search
ebook.online-convert.com
Turns EPUB, MOBI, AZW3 and PDF into whatever your e-reader actually opens
smallpdf.com
The tidiest PDF suite, rationed to a couple of jobs a day
svgco.de
Traces a PNG or JPEG into a scalable SVG inside the browser
tableconvert.com
Converts a table between CSV, JSON, Markdown, SQL and Excel
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
Cuts across
A tag is orthogonal to the category tree — that is what makes it worth having.