Gratis online tools

Calculate relative humidity, dew point, wet-bulb temperature, vapor pressure, absolute humidity, and mixing ratio from dry-bulb readings. Free, browser-based.

Estimate your annual carbon footprint from car travel, flights, home electricity, and natural gas. Compare to global averages with regional grid factors. Free, browser-based.

Analyze temperature and precipitation climate data. Paste daily or monthly values to get mean, min, max, std dev, heating/cooling degree days, wet days, dry spells, and Northern Hemisphere seasonal summaries (DJF, MAM, JJA, SON). Free, browser-based.

Convert microliters (µL) to milliliters, liters, nanoliters, cubic centimeters, and more. Instant lab volume conversions with all units shown at once. Free, browser-based.

Plot data as line, scatter, or bar charts from x,y pairs or separate columns. Enter lab results, calibration curves, or trial data — get an instant SVG chart with axis labels. Free, browser-based.

Convert PDF pages to JPG images in your browser with adjustable quality and resolution.

Add password protection and permission restrictions to PDF files entirely in your browser.

Upload a PDF and generate an AI summary using your own OpenAI, Anthropic, Google, or Groq API key.

Draft professional emails with AI using your own OpenAI, Anthropic, Google, or Groq API key.

Generate SEO-friendly blog posts with title, meta description, and markdown content using your own AI API key.

Generate relevant social media hashtags for Instagram, TikTok, LinkedIn, and more using your own AI API key.

Compress images in your browser by adjusting quality, output format, and max dimensions to reduce file size.