Herramientas online gratuitas
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
Image Text Extractor
Free image to text OCR — extract text from multiple images in any language and copy results in order. Runs in your browser.
Boyle's Law Calculator
Boyle's law calculator free — solve P1V1=P2V2 for pressure or volume at constant temperature. atm, kPa, L, mL. No signup.
ROI Calculator
Calculate return on investment (ROI), net gain, and annualized ROI from your initial investment and returns.
Color Mixer
Blend two or more HEX colors with adjustable weights using RGB or HSL mixing and copy the mixed result.
Audio Joiner Merger
Free online audio joiner and merger — combine multiple MP3, WAV, or M4A files into one track in your browser. No upload, no signup, private.
EXIF Metadata Stripper
Free EXIF metadata stripper — remove GPS location, camera model, and photo metadata in your browser. Privacy-first, nothing uploaded.
Waveform Visualizer
Free online waveform visualizer — see the amplitude shape of any audio file in your browser. Zoom, scrub, and export a PNG. Private, no signup.
Gravity on Other Planets
Compare surface gravity on Mercury, Venus, Mars, Jupiter, the Moon, and every planet. See gravity in m/s², percent of Earth, and weight for any mass. Free, browser-based.
Oxidation Number Calculator
Find oxidation numbers in chemical formulas using standard rules — H2SO4, KMnO4, NH3, and polyatomic ions. Free, instant, browser-based.
Porn Addiction Recovery Tracker
Free private recovery tracker: streaks, urge timer, triggers, journal, and relapse support. Browser-based, no signup, data stays on your device.
Env Leak Scanner
Free env leak scanner — paste logs, configs, or .env snippets and flag likely API keys, tokens, and secrets. Runs locally; nothing is uploaded.
Break Even Calculator
Find how many units or how much revenue you need to cover fixed costs and break even.