In development
Email archiver
Turn batches of Outlook .msg and .eml files into PDFs with their attachments. Conversion runs in your browser, so the emails never leave your computer.
Four tools in development
Small, dependable tools for files, documents and websites.
Calderkit builds focused software that does one job properly: moving content between systems, converting awkward file formats, and fixing documents so everyone can read them. Where we can, the work happens in your browser and your files stay on your device.
Products
One stubborn problem per tool.
Each product does a single job well and works on its own, without setup calls or accounts you don't need.
In development
WordPress importer
Move a large WordPress export into a new site without timeouts. Imports resume where they stopped, media downloads are retried, and you get a report you can read.
In development
PDF accessibility check
See which accessibility requirements a PDF fails, then fix its structure, reading order, document language and image descriptions automatically.
In development
Quiz converter
Paste or upload quiz questions from Word or PDF, check them, and download a file your learning platform can import.
How we work
Simple rules we keep.
Self-serve
Every tool works on its own, with clear instructions and error messages. No sales calls, no onboarding meetings.
Private by default
This site has no cookies, no analytics and no third-party scripts. Our tools collect only what they need to work.
Fair refunds
If a paid product doesn't work for you, ask within 14 days for a full refund. See the refund policy.