ToolKit is a privacy-first suite of professional tools for e-invoicing compliance and developer workflows — built in Germany to help you stay compliant without the complexity.
Germany's 2025 e-invoicing mandate created a compliance challenge for thousands of small and medium-sized businesses. The XRechnung standard — the official format for electronic invoices in German B2B and B2G transactions — is powerful but technically demanding. Most existing tools were either too expensive, too complex, or required uploading sensitive financial data to third-party servers.
We built ToolKit to solve this problem. Every tool on this platform runs entirely in your browser. Your invoice files, XML data, and business information never leave your device — unless you explicitly use our Pro GoBD Vault feature. No registration required to get started.
Beyond e-invoicing, we recognized that developers working with German business data needed a reliable set of daily-use utilities: XML viewers, JSON formatters, Base64 encoders, timestamp converters, and UUID generators — all with the same privacy-first approach. ToolKit brings these together in one place.
All tools process data client-side in your browser. We have no access to your invoices, XML, or any data you enter into our tools.
Our XRechnung tools are built specifically for German legal requirements: DSGVO, GoBD audit trails, and KOSIT validation standards.
Every tool has a generous free tier. Developer utilities are fully unlimited for free. Pro unlocks batch processing and advanced features for €4.99/month.
Parse, validate, and repair German e-invoices (XRechnung, ZUGFeRD) with a GoBD-compliant audit trail.
Generate fully compliant XRechnung XML and ZUGFeRD hybrid PDF invoices from a structured form.
A searchable reference for all XRechnung KOSIT validation error codes with step-by-step fix guides.
Instantly parse and format any XML document with an interactive collapsible tree view.
Validate, format, minify, and diff JSON data. Syntax error highlighting and tree view included.
Encode and decode Base64, URL, HTML entities, JWT tokens, and hexadecimal instantly in your browser.
Convert Unix epoch timestamps to human-readable dates with timezone support and a live epoch counter.
Generate cryptographically secure UUID v4 identifiers instantly, with bulk generation support.
ToolKit is developed and operated by Blue Cala Films, a company based in Eschborn, Germany. We are passionate about building efficient, well-designed software that makes complex compliance tasks straightforward for German businesses and the developers who serve them.
This platform is maintained by a small, dedicated team. We believe in transparent, honest software: no hidden data collection, no dark patterns, and no misleading claims.
For legal disclosures, see our Impressum. · For privacy inquiries, see our Privacy Policy.