About Apyrn Tools
How Apyrn Tools work: every tool runs in your browser, inputs are not sent to a server, and tax calculators are dated and linked to official sources.
Last reviewed
What these tools are
Apyrn Tools is a free collection of tools for everyday work: document generators for invoices, quotations, salary slips and HR letters; finance and tax calculators; developer utilities for JSON, regular expressions, JWTs, cron and Base64; and planning worksheets for AI usage, APIs and enterprise data. There is no account to create and nothing to install.
Everything runs in your browser
Each tool does its work in the page you have open. What you type, paste or upload, including logos, photos, tokens and payloads, is not sent to a server. Downloads such as PDFs and images are created on your device.
Saved drafts and your data
Some tools keep a draft in your browser's own storage so you can pick up where you left off. That draft stays on your device; you can clear it with the tool's Reset button or by clearing this site's data in your browser settings. Shareable links include only the non-private fields of a tool, never customer details, line items, logos or signatures.
Optional analytics
Usage analytics are off unless you allow them. If you do, only anonymous page and action counts are recorded, never form values or document contents. You can change your choice at any time from Privacy settings in the footer.
How calculators are reviewed
Calculators that depend on rules which change, such as income tax slabs and GST rates, show the date they were last reviewed and link to the official sources used. Planning calculators state the assumptions behind their numbers, and rates you type in, such as AI token prices or exchange rates, are yours to check. Results are estimates to help you plan; they are not tax, legal or financial advice.
Who makes them
The tools are made by Apyrn. Apyrn builds Apyrn One, an enterprise API control plane that connects the systems a company already runs and publishes governed APIs and MCP tools for its applications, analytics and AI agents, while those systems of record keep their authority. Apyrn One is available as Apyrn One Cloud, hosted by Apyrn, and Apyrn One Enterprise, which runs in the customer's own environment.