Free Online Tools
405+ 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 category below.
Total tools405Available free tools
Categories15Active categories
Most usedCSV to ExcelPopular right now
Recently addedInterval Music RepeaterNewest tool
Empirical Formula Calculator
Empirical formula calculator free — find simplest formula from mass % or element masses. Mole ratios in your browser, no signup.
Rainfall Calculator
Calculate rainfall volume from catchment area and depth, estimate storm runoff with a runoff coefficient, or compute rainfall intensity (mm/hr). Metric and imperial units. Free, instant, browser-based.
GST Invoice Generator
Create GST-compliant tax invoices with CGST, SGST, or IGST, HSN/SAC codes, and PDF export.
Favicon & Icon Checker
Test favicons, Apple Touch icons, and Android manifest icons for any website URL. Free favicon checker, no signup.
Ohm's Law Calculator
Free Ohm's law calculator — solve for voltage, current, resistance, or power from any two values. Instant results in your browser.
VS Code Extensions Store
Browse VS Code extensions and developer tools from our store — Space Invaders, Cute Critters, and more. View details and buy on Gumroad.
Reddit Post Template Maker
Free Reddit post mockup maker — design feed cards and post pages, save templates locally, and download PNG screenshots.
Large Sitemap Manager
Split oversized sitemaps into Google-safe files and generate a sitemap index for large sites (50k URL / 50MB limits).
Steam ID Converter
Free Steam ID converter — convert between SteamID, SteamID3, and SteamID64 entirely in your browser. Copy any format.
CSV to JSON
Convert CSV spreadsheets to JSON arrays with header detection, type parsing, and dot-key unflattening.
Clip Path Generator
Design CSS clip-path shapes with live preview and copy-ready CSS, inline styles, and Tailwind classes.
Water Flow Calculator
Calculate volumetric flow rate Q = A × v for pipes and open channels, estimate flow with Manning's equation, or convert between L/s, GPM, CFS, and m³/s. Metric and imperial units. Free, instant, browser-based.