Tools Online (tools-online.site) is a free collection of online tools organized into 15 categories with 100+ tools plus 1,200+ AI site listings:
- PDF Tools — 12 PDF converters and utilities: format conversion, merge, split, compress, encrypt, watermark, plus an AI deep-parse that reconstructs PDFs into Word / Markdown / HTML.
- Finance — 10 financial calculators: compound interest, mortgage payments, early payoff, SIP, CAGR, inflation, retirement, savings goals, percentages, and currency conversion.
- Developer · Text · Calculators · Health · Random · Fun Tests · Image · Design · Security · Dev Helpers · More — everyday tools for JSON/XML, encodings, timestamps, regex, unit conversion, BMI, image processing, CSS generation, passwords and more.
- Network — IP lookup, WHOIS, DNS, HTTP client, WebSocket tester and SSL certificate checks.
Our principle is "local when possible": calculation, conversion and file-processing tools run entirely inside your own browser — nothing is uploaded or stored. Network-lookup tools relay requests through our server to public data sources without recording your queries. The cloud-powered AI deep-parse only relays files to a parsing service as a transit channel; we keep no copies.
Each tool documents its formula and offers verifiable breakdowns. Tools Online is funded by a small number of display ads. Feedback is always welcome.
Contact: for questions, suggestions or copyright matters, email [email protected].