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General Calculators Everyday math: percentages, discounts, dates, unit conversions, and more. 2 tools Student Tools GPA, grades, study planning, and homework helpers. 4 tools Data Science & Statistics Averages, variance, correlation, probability, and small statistical utilities. 4 tools Machine Learning & AI Interactive demos and explainers that run entirely in your browser. 13 tools Developer Tools Encoding, formatting, validation, and small everyday utilities. 13 tools Text & File Utilities Word counts, case conversion, generators, and text cleanup. 2 tools Cybersecurity & Cryptography Hashing, encryption, encoding, HMAC, and cryptographic tools. 134 tools Image Tools Compress, resize, convert, and optimize images — all processed locally in your browser. 5 tools PDF Tools Merge, split, and compress PDF files — everything runs in your browser, no uploads needed. 3 tools