Free Online Tools

Build a .gitignore file by combining templates for languages, frameworks, editors, and operating systems.

Find the mean, median, and mode of any data set with frequency tables, sorted data, and step-by-step work.

Test regular expressions live against sample text with flags, match details, and replace preview.

Send HTTP requests with custom methods, headers, and bodies, then inspect status, headers, and response — no CORS limits.

Format and beautify CSS stylesheets with indentation, readable rules, and optional minification.

Calculate cell count after binary fission — solve for N, N₀, divisions, generation time, or elapsed time with step-by-step growth table. Free, browser-based.

Calculate fluid velocity from volumetric flow rate and cross-section geometry. Modes: circular pipe, rectangular channel, annulus, known area, continuity (pipe reducer), and velocity unit converter. Reynolds number and flow regime. Metric and imperial units. Free, browser-based.

Convert RGB and RGBA channel values into HEX color codes with a live preview.

Build linear and radial CSS gradients with multiple color stops, live preview, and copy-ready code.

Build Unix cron schedules with presets, custom fields, validation, and plain-English explanations.

Encrypt and decrypt text with RSA-OAEP public/private keys, including hybrid mode for longer messages.

Decrypt RSA-OAEP JSON payloads with your private key, including hybrid RSA + AES-GCM ciphertext.