Free calculators & browser utilities
For students, writers, developers, and everyday planning: money and mortgage tools, health estimates, dates and time zones, text cleanup, JSON, and more — all run privately in your browser. Filter by tag, search by name, or open a tool below.
Private tools that stay in your tab
Nceptia hosts dozens of single-purpose utilities — mortgage math, Markdown preview, batch photo resizing, SQLite practice, and more. Most tools process input with JavaScript or WebAssembly on your device, so unpublished drafts, shop photos, and salary figures are not uploaded for conversion.
Finance & shopping
Compare loan terms, estimate take-home pay, convert currencies, split restaurant bills, and normalize unit prices at the grocery store.
Writing & development
Count words, clean pasted PDF text, format JSON, test regex patterns, decode JWT claims, and preview README Markdown before you commit.
Images & files
Resize listing photos for Etsy or Shopify, find duplicate product shots, merge PDFs locally, and verify download checksums.
Time & wellness
Plan meetings across time zones, run a Pomodoro focus timer, count down to holidays, and use illustrative BMI or hydration estimates.