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
ezgif.com
Makes, crops, speeds up and optimises animated GIFs and short clips
ezyzip.com
Opens and builds ZIP, RAR and 7z archives without uploading them
iloveimg.com
Batch resize, crop, compress and watermark a folder of images
ilovepdf.com
Merge, split, compress, unlock and convert PDFs from one toolbar
ocr.space
Pulls the text out of a scan or screenshot with no sign-up
ebook.online-convert.com
Turns EPUB, MOBI, AZW3 and PDF into whatever your e-reader actually opens
tools.pdf24.org
Around thirty free PDF tools with no account and no daily counter
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
tableconvert.com
Converts a table between CSV, JSON, Markdown, SQL and Excel
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
Where these come from
A real job usually crosses two or three categories, which is why starting from the task is often faster than starting from the shelf.
Questions
Pick a converter that runs in your browser rather than uploading, check it supports your exact input and output pair, and confirm the output size limit before you start. Browser-side converters keep the file on your machine, which matters for anything with personal data in it.
Yes — 12 of the 19 sites listed here work with no account at all. They are marked "No sign-up" and you can spot them by the green rule down the left edge of the card.
6 of these do the work inside your browser and never upload the file — those are the ones to use for anything with personal data in it. The rest send your input to their servers, which is fine for public material.