100+ Free Online Tools

Compress images to reduce file size while maintaining quality. Supports PNG, JPG, and WEBP formats with adjustable quality settings. Convert between formats for optimal compression. All processing runs locally in your browser - files never leave your device.

Generate professional AI-powered replies to messages with customizable tone and style. Perfect for emails, chats, and messages.

Convert GIF images to modern WEBP format with superior compression and quality. Reduce file sizes significantly while maintaining image quality. Perfect for web optimization and faster loading times. All conversions run locally in your browser - files never leave your device.

Generate professional ad creatives instantly with AI. Create 5 compelling captions, 3 short descriptions, catchy punchlines, and powerful CTAs. Choose from punchy, emotional, clever, or salesy styles. Perfect for social media ads, marketing campaigns, and advertising copy.

Convert PNG, JPG, and GIF images to modern WEBP format with superior compression and quality. Reduce file sizes by up to 30% compared to JPG while maintaining excellent visual quality. All conversions run locally in your browser - files never leave your device.

Count words, characters, sentences, and reading time instantly

Generate personalised B2B cold emails in seconds. Enter the recipient details and your product or service, choose a tone, and the AI writes a concise, reply-worthy email complete with subject line, opening hook, value pitch, and call to action.

Change the page size of any PDF to A4, Letter, Legal, A3, A5, Tabloid, or Executive. Choose how content is fitted — scale to fit, scale to fill, stretch, or centre. All processing runs in your browser. Nothing is uploaded.

Validate CSS syntax instantly in your browser. Get real-time feedback on errors and warnings with exact line and column numbers. Shows rule count, declarations, selectors, at-rules, and comment statistics.

Test HTTP API endpoints directly in your browser. Make GET, POST, PUT, PATCH, and DELETE requests with custom headers and request bodies. View status codes, response headers, and pretty-printed JSON responses — all client-side, no server proxy.

Convert a colour PDF to grayscale instantly in your browser. All pages are processed locally — nothing is uploaded to any server. Works with scanned documents, presentations, and any PDF file.

Validate YAML syntax instantly in your browser. Get real-time feedback on errors with exact line and column numbers. Supports multi-document YAML and shows document statistics including nesting depth and key counts.

Calculate screen width and height from diagonal size and aspect ratio. Convert between inches and centimeters for displays, TVs, and monitors with instant dimension calculations.

Calculate DPI (dots per inch), image dimensions, and print sizes. Convert between pixels and physical dimensions for printing and displays.

Convert between international paper sizes (A4, Letter, Legal) with dimensions in mm, cm, and inches. Compare ISO A/B series and North American paper standards.

Convert between MPG (miles per gallon), L/100km (liters per 100 kilometers), and other fuel efficiency units. Compare car fuel economy across different measurement systems.

Split large CSV files into smaller files by number of rows. Process large datasets in manageable chunks instantly.

Generate JSON-LD Product schema markup for SEO. Add product details like name, price, brand, rating, and availability to create structured data for rich search results.