ZZTools - Free Online Tools

zztools.org collects 43 small tools for the file jobs that come up every week: converting iPhone HEIC photos to JPG, compressing an image to exactly 50 KB for a visa application, merging or splitting PDFs, encrypting a PDF with a password, cropping a photo to an exact pixel size, generating UUIDs, comparing two pieces of text, validating an IBAN.

Most of them process your file locally in the browser, so nothing is uploaded and nothing is stored. No account, no sign-up, no email. If you want to know how that works — and how to verify it yourself — start with the guide on browser-local processing.

The tools are free and stay free, and none of them hides behind a sign-up wall, an installer or a watermark. There is no “download our app” banner, and no tool asks for your email address before handing back a file you already own. Advertising on the tool pages pays for the servers, which is the only reason the site can stay that way.

Every tool is written and maintained in-house rather than resold from a template marketplace, and the same goes for the guides. When a browser changes how a feature behaves, the affected tool is updated and the guide that describes it is revised in the same release — which is why each page shows the date it was last reviewed.