BTradeTech · Wonder Tools

Free online tools for files and business

Compress images, create QR codes, sign PDFs, generate PDF invoices and explore financial data, with one clear page for each working tool.

✓ Local where possible✓ English & German✓ No account

Local-first & transparent

What Wonder Tools does

Practical helpers for images, PDFs, invoices, QR codes, finance and markets – with clear limits and no unnecessary accounts.

How to use a tool

Money & Markets

Calculate payments, interest, fees, extra repayments and an explicit amortization basis.

Compare cash, financing, leasing and refinancing over the same time horizon.

Prices, history and market context for approved instruments with a clear source.

Convert currencies transparently with a daily ECB reference rate.

Files & Business

Resize JPG, PNG and WebP images locally to a target size or dimensions.

Create static QR codes for URLs, text, Wi-Fi, contact, email and phone.

Draw, type or upload a signature and place it into a PDF locally.

Create a free PDF invoice online with line items, tax, discounts and payment details.

FAQ

Are the online tools free?

Yes. The available local tools can be used without an account.

Are my files stored?

No. Image, PDF and invoice tools process content locally in the browser. QR input is sent briefly to a stateless server endpoint for generation.