About StacckApp
Free, fast, privacy-friendly developer tools
Last updated May 29, 2026
What this site is
StacckApp is a free collection of 93 small, focused developer and everyday utilities — encoders, converters, generators, formatters, calculators, and more. Each one does a single job well, loads fast, and works without sign-up, paywalls, or clutter.
Privacy by design
Most online tools quietly upload your data to a server to do their work. StacckApp takes the opposite approach: the tools run entirely in your browser, so the text, files, and images you work with stay on your own device. That makes the site fast, usable offline in many cases, and safe to use with sensitive input. You can read the details in our Privacy Policy.
Why it exists
Developers reach for the same handful of small utilities every day, and too often end up on slow, ad-choked, or sketchy sites to find them. The goal of StacckApp is to gather those everyday tools in one clean, trustworthy place that respects your time and your data. The site is supported by unobtrusive advertising so the tools can stay free for everyone.
Get in touch
Have a tool you wish existed, found a bug, or just want to say hello? Use the feedback button on any page, or email [email protected]. You can also browse the full list of tools.