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268+ 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 tools26810.8K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedExperiment RandomizerNewest tool
Humidity Calculator
Calculate relative humidity, dew point, wet-bulb temperature, vapor pressure, absolute humidity, and mixing ratio from dry-bulb readings. Free, browser-based.
Used 1 times•Updated 6 minutes ago
Error Percentage Calculator
Calculate percent error, absolute error, relative error, and percent difference between measured and accepted values. Step-by-step formulas for physics and chemistry lab reports. Free, instant, browser-based.
Used 1 times•Updated 56 minutes ago
PDF to JPG
Convert PDF pages to JPG images in your browser with adjustable quality and resolution.
Used 0 times•Updated never
Merge PDF
Combine multiple PDF files into one document in your browser, with drag-free reordering and instant download.
Used 0 times•Updated never
Split PDF
Split a PDF into separate files by page, fixed chunks, or custom ranges — entirely in your browser.
Used 0 times•Updated never
PDF Password Protect
Add password protection and permission restrictions to PDF files entirely in your browser.
Used 0 times•Updated never
PDF Summary Generator
Upload a PDF and generate an AI summary using your own OpenAI, Anthropic, Google, or Groq API key.
Used 0 times•Updated never
AI Email Writer
Draft professional emails with AI using your own OpenAI, Anthropic, Google, or Groq API key.
Used 0 times•Updated never
AI Blog Generator
Generate SEO-friendly blog posts with title, meta description, and markdown content using your own AI API key.
Used 0 times•Updated never
AI Hashtag Generator
Generate relevant social media hashtags for Instagram, TikTok, LinkedIn, and more using your own AI API key.
Used 0 times•Updated never
Image Resizer
Resize images in your browser with custom dimensions, aspect-ratio lock, and format export.
Used 0 times•Updated never
Image Converter
Convert images between PNG, JPG, WebP, AVIF, and BMP right in your browser, with quality control and transparency handling.
Used 0 times•Updated never