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
WhatsApp Chat Generator
Free WhatsApp chat generator — design realistic chat mockups, customize ticks and replies, save templates locally, and download PNG screenshots.
White Noise Generator
Free white noise generator — play white, pink, or brown noise for focus, sleep, or masking. Adjustable volume, private Web Audio in your browser.
Planet Weight Calculator
Find your weight on Mercury, Venus, Mars, Jupiter, the Moon, and other worlds. Enter Earth weight in kg or lb and compare surface gravity instantly. Free, browser-based.
Color Contrast Checker
Check WCAG contrast ratios between text and background colors for accessibility compliance.
Voice Recorder
Free online voice recorder — record audio from your microphone and download as WAV or WebM. Private, browser-based, no signup or watermark.
Images PDF Converter
Free images to PDF and PDF to images converter — build a PDF from JPG/PNG/WebP or export pages to a ZIP. Private, in your browser, no signup.
Sales Tax Calculator
Add or remove sales tax from any amount — US state presets, custom rates, and instant totals.
Population Growth Calculator
Calculate population growth with exponential and logistic models — solve for N, growth rate r, time, or N₀ with projections and doubling time. Free, browser-based.
Gacha Pity Tracker
Free gacha pity tracker — track pulls toward soft and hard pity, estimate next-pull odds, and keep progress in your browser only.
PDF Summary Generator
Upload a PDF and generate an AI summary using your own OpenAI, Anthropic, Google, or Groq API key.
HTML Email Template Builder
Build responsive, table-based HTML email templates with inline styles. Preview and copy production-ready markup.
Interval Music Repeater
Free music interval repeater. Upload MP3, WAV, M4A, OGG, or WebM and replay it after a gap, on a timer, or as a section loop. Browser only, no signup.