Skip to main content

Free Online Tools

254+ free online tools for PDF, images, SEO, developers, color, and productivity. Fast, browser-based, and private — no signup, no installs, no limits. Search above or browse by collection below.

Total tools25410.7K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedSafety Factor CalculatorNewest tool
Scientific Tools
Bolt Torque Calculator
Calculate bolt tightening torque, clamp preload, and nut factor K. Modes: torque from preload (T = KDF), preload from torque, recommended torque from proof load and bolt grade, and nut-factor solver. Metric (mm, kN, N·m) and imperial (in, lbf, lbf·ft) with M6–M24 and Grade 5/8 presets. Free, browser-based.
Used 0 timesUpdated never
Open Tool
Scientific Tools
Safety Factor Calculator
Calculate safety factor, margin of safety, and utilization from strength and stress or load and capacity. Modes: SF from stress, SF from load, allowable stress, required strength, and design pass/fail check. Material yield presets. Metric (MPa, kN) and imperial (ksi, lbf). Free, browser-based.
Used 0 timesUpdated never
Open Tool