Bulk Resize Photos
bulkresizephotos.com
Resizes hundreds of photos at once without uploading any of them
No sign-upOn device
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bulkresizephotos.com
Resizes hundreds of photos at once without uploading any of them
clideo.com
Single-job video utilities: compress, merge, resize, loop, add audio
ezgif.com
Makes, crops, speeds up and optimises animated GIFs and short clips
iloveimg.com
Batch resize, crop, compress and watermark a folder of images
ilovepdf.com
Merge, split, compress, unlock and convert PDFs from one toolbar
tools.pdf24.org
Around thirty free PDF tools with no account and no daily counter
smallpdf.com
The tidiest PDF suite, rationed to a couple of jobs a day
squoosh.app
Compare image compression settings side by side before you export
stirlingpdf.io
Fifty PDF tools you can also run on your own machine in Docker
tinypng.com
Shrinks PNG and JPEG files by half with no visible difference
tinywow.com
A couple of hundred small file tools, free and with no account
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
Compression is a trade, not a free win. For images, drop to WebP or AVIF before you touch quality sliders. For PDFs, downsampling embedded images usually gets you 80% of the saving. For video, changing the codec beats lowering the bitrate.
Yes — 6 of the 11 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.
2 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.