About Monu Tools

Monu Tools is a free collection of online tools for everyday technical work: formatting and converting data, editing and compressing images, working with PDFs, generating and checking text, and running finance calculators. The guiding idea is simple. The tools should be fast, they should respect your privacy, and they should not ask you to sign up, install anything, or pay.

Almost everything here runs entirely in your browser. When you format JSON, remove an image background, redact a PDF, or calculate your net salary, the data never leaves your device. There is no upload step and no server doing the work in the background. That is not a marketing line, it is how the tools are built: the processing happens locally with code that ships to your browser, which is why most of them keep working even with a flaky connection.

Who builds it

My name is Maxwell Aboagye. I am a backend and data engineer based in Hamburg, Germany. I work mostly with backend systems, data pipelines, and integrations, and I build Monu Tools in my own time because the small utilities I reached for online were usually covered in ads, slow, or quietly sending my data to a server I did not choose.

I grew up in Ghana, went to school in Italy, and now live in Germany, so building a site that works in many languages and across different tax and number conventions is something I care about personally. You can see more of my background and other projects on my personal site.

What makes the tools different

• On-device by default. Image, PDF, text, and data tools process your input in the browser. Nothing is uploaded, stored, or logged. Where a tool genuinely needs an external service (for example, looking up an IP address), it says so clearly and only does it when you ask.
• Finance tools built on official formulas. The German salary and tax calculators use the official BMF wage-tax calculation (PAP), and the other finance tools are based on published government rates and indices. Each explains how it computes its result and links to the source, so you can check the numbers rather than trust them blindly.
• No account, no paywall. Every tool is free to use, with no sign-up and no usage limit. The site is supported by ads.
• Genuinely multilingual. Tools and the Learn articles are available in many languages, with locale-aware number, date, and currency formatting rather than a machine translation slapped on top.

Learn, not just do

Alongside the tools there is a growing Learn section: plain-language explainers on the topics behind the tools, from how a JWT is structured and why email regex validation is hard, to how German income tax brackets work and what EXIF metadata reveals about your photos. The goal is that you leave understanding the thing, not just having run a button.

Contact

Questions, bug reports, or a tool you wish existed? I would like to hear it. Reach me at info@monu.tools or via the contact page.