If you would rather not go hunting for them one at a time: here is the whole shelf. Every one is free forever, works in your browser, and never uploads your files anywhere. No accounts. No trial. No thing that asks for your email before it will do the job you came to do.
Roam is the reason any of this exists — a button that drops you somewhere good on the internet, with no feed and no algorithm deciding for you. The tools are what happened when I kept needing something and nobody would give it to me without a subscription.
Go wander →Why these are free. Almost every one of these replaces something that charges a subscription for arithmetic. Signing a PDF is drawing a picture on a page. Converting units is multiplication. A QR code is a static image that some companies rent back to you and switch off when you stop paying. None of that is worth a monthly fee, so none of it costs anything here.
Why nothing uploads. The paid versions work by taking your file to their server. That means your contract, your bank statement or your kid's photo sits on somebody else's machine. These run entirely inside your browser instead, which is slightly harder to build and enormously better for you. Turn off your internet after the page loads and most of them keep working.
Why there is a coffee button and nothing else. No ads, no tracking, no upsell, no "pro" tier waiting behind the good features. If something here saved you a subscription or an afternoon, the button is there. If not, use it all anyway.