About
Small tools, stored like acorns
Dotori (도토리) is Korean for acorn: something small you put away and are glad to have later. Dotori Tools is run by Dotoriecon. It started in October 2026 as the everyday-tools corner of Radiation Lab, free radiation calculators by the same maker, and now stands on its own here.
The rule carried over unchanged: every tool runs in your browser, and nothing you open leaves it. The work it covers is everyday: labels for samples and stock, PDFs for reports, photos for documentation, screenshots for guides. The 16 tools here are general on purpose, so anyone can use them, and they are built from scratch rather than copied from other tool sites.
What you can count on
- Everything runs on your device
Each tool is a program that runs inside your browser. Your files are opened, changed and saved on your computer or phone; they are never sent to us or to anyone else. Some tools fetch a program component the first time (for example an AI model), and that is a one-way download.
- Free, with no account and no limits
There is no sign-up wall, no watermark, no daily cap and no premium tier. Signing in with Google is optional and only keeps your recent work list across devices.
- Sources are named
Sample files are either made here or are public-domain works with their source and licence listed. Fonts, AI models and other components are self-hosted under open licences, and the build fails if any file lacks its licence record.
- Output you can print and publish
Where it matters the output is vector (SVG and PDF with selectable text); everywhere else it is full resolution. Nothing is downscaled unless you ask for it.
What the site keeps
Your settings and a short list of recent work stay in this browser so you can reopen them; the History page shows and clears them. If you sign in, that list is also saved to your account. Files themselves are never stored. The full statement is on the privacy page.
The tools
Images
Browser
Questions and requests
Found a bug, or need a tool that is not here yet? Write to contact@dotoriecon.com. Requests for new tools are read; the ones that can run entirely in a browser come first.