Free resources

Research, calculators & reference tools

Statistics, benchmarks, and interactive helpers for PDF workflows, invoicing, and small-business documents — free to use, no signup required.

Statistics & data

Reference table of Gmail, Outlook, WhatsApp, job portal, and government upload limits — with official sources.

Payment terms, late payments, and common invoice mistakes — with sources for freelancers and SMBs.

Methodology and results for digital, scanned, and invoice PDFs at different compression quality levels.

Work out your minimum hourly rate from income goals, taxes, expenses, and billable hours.

Interactive checklist: does your tax invoice include mandatory GST fields?

SEO tool using Google Search Console — marketing blogs link to free GSC utilities.

Reference table + converter — jewelry and fashion blogs embed ring size charts.

Interactive tool: pick a destination (email, portal, form) and file size — instant pass/fail with compress link.

How long to keep invoices, tax records, and contracts in India, UK, US, Australia, and Canada.

Feature-by-feature comparison of RatPDF vs iLovePDF, Smallpdf, Adobe, and others.

Browse every free PDF tool: compress, merge, convert, OCR, sign, and secure workflows.

Compress, merge, convert, and more — 22+ free PDF tools in the browser.