Help Center
Frequently Asked Questions
Find answers to common questions about our tools and service.
General
Yes! Every single tool on AllCalculators.in is completely free — no subscription, no credit card, no hidden charges. Free forever.
No. You can use all 40+ tools instantly without signing up or logging in. Just visit the tool page and start using it.
Most tools run entirely in your browser using JavaScript — your files and data never leave your device. For server-side features like URL shortening, we store minimal data securely and never share it.
Absolutely! AllCalculators.in is mobile-first and works perfectly on smartphones, tablets, and desktops.
We add new tools regularly based on user requests. Subscribe to our newsletter to get notified.
Most tools work offline once the page has loaded, as they run in your browser. Tools requiring live data (currency rates, speed test) need internet.
Image Tools
It uses the HTML5 Canvas API to re-encode your image with progressively lower quality settings until the file size falls under the target (30KB). Everything runs in your browser.
PNG is a lossless format, so size reduction is achieved through resolution downscaling. For the smallest file sizes, choose JPEG or WebP output format.
We use a binary-search algorithm to find the highest quality that still meets the size target. Results are generally excellent, especially for JPEG/WebP.
Yes! Drag and drop multiple files onto the drop zone to compress them all simultaneously.
Calculators
The EMI formula used is the standard reducing-balance formula used by all major banks. Results match bank calculations exactly.
Our GST calculator supports all Indian GST slabs: 0%, 5%, 12%, 18%, and 28%, plus CGST/SGST/IGST breakdown.
Standard BMI is designed for adults (18+). For children, BMI-for-age percentiles should be used. Consult a healthcare professional.
Currency rates are fetched from a free API and updated regularly. For critical financial decisions, verify with your bank.
Developer Tools
Yes! It validates JSON syntax and shows error messages with line numbers if the JSON is malformed.
Yes. Our HTML, CSS, and JavaScript minifiers only remove whitespace and comments — functionality is never changed.
Standard Base64 (RFC 4648), URL-safe Base64, and binary/file encoding are all supported.
Privacy & Security
No. Image files are processed entirely in your browser using the Canvas API. Nothing is uploaded to our servers.
We use Google Analytics to track page views and general usage patterns (anonymized). We do not track individual tool inputs or results.
Yes! We use the browser's cryptographically secure random number generator (window.crypto.getRandomValues) for all password generation.