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Markdown → Rich Text / Excel — Convert Markdown to rich text you can paste into Word, Gmail or Google Docs, or export tables to Excel.
Follow-Back Checker — Find out who you follow on Instagram or TikTok who doesn't follow you back, using your own data export.
Bulk UTM Builder — Build UTM-tagged URLs in bulk. Import CSV, paste lists, and export to CSV or XLSX.
Robots.txt Tester — Test whether a URL is allowed or blocked by a robots.txt file, applying Google's documented matching rules.
JSON → TypeScript / Zod / Prisma — Generate TypeScript interfaces, Zod schemas and Prisma models from JSON.
EU Parcel Duty Calculator — Estimate VAT, customs duty and handling fees for low-value parcels entering the EU.
Europe Stay Planner — Calculate Schengen 90/180-day rolling windows for visa-exempt travelers.
Curing Salt Calculator — Calculate the correct amount of Cure #1 or Cure #2 for a given meat weight and target concentration.
ICS → CSV / Excel — Convert iCalendar (.ics) files to CSV, Excel or JSON with recurring events expanded.
Shift Calendar Generator — Generate rotating shift calendars (4-on/4-off, DuPont, Pitman or custom) and export to ICS or CSV.

Contact

Questions, bug reports and suggestions about these tools are welcome.

Email

hello@utilvia.online

What we cannot help with

We cannot access, restore or process your uploaded files — they never leave your browser.
We cannot give binding advice on customs, immigration or food safety. Please contact the relevant authority or a qualified professional.
We cannot help recover social-media accounts or bypass platform limits.

Reporting a calculation error

Useful reports include the tool name, the exact inputs you used, the result you expected and the result you received. Every calculator page shows the rule version and sources it relies on, which helps us trace where a rule may have changed.