78 tools
Explore our curated collection of 100+ stunning color gradients. Click gradient swatches to view individual colors, copy CSS code instantly, and find perfect gradient combinations for your designs.
Browse 200+ professionally curated color palettes organized by category. Copy colors instantly, favorite palettes, export as CSS, JSON, PNG, or PDF. Perfect for designers and developers.
View and interact with 3D OFF (Object File Format) models directly in your browser. Upload OFF files and explore them with interactive 3D controls, environment settings, auto-rotation, and screenshot capabilities.
Browse our comprehensive library of 500+ popular named colors organized into 20 categories. Search colors by name or HEX code, copy values instantly, and explore color groups from basic to vintage.
Add professional barcodes to PDF documents online for free. Support for multiple barcode formats including CODE128, EAN13, UPC, and more. No upload required - all processing happens in your browser.
Add digital signatures to your PDF documents securely and easily. Support for text, image, and handwritten signatures with date stamps. All processing happens in your browser.
Add customized page numbers to PDF documents online for free. Choose from multiple formats, positions, and styling options. All processing happens in your browser for complete privacy.
Add QR codes to existing PDF documents online for free. Generate QR codes for URLs, text, vCard, WiFi, social media, and more, then embed them into your PDF files with drag-and-drop positioning.
Add customizable watermarks to your PDF documents for security and branding. Control text, color, opacity, size, and rotation. All processing happens in your browser for complete privacy.
Calculate your body fat percentage using the US Navy method with our free body fat calculator. Get detailed body composition analysis, health score, and fitness recommendations based on your measurements.
Calculate total working days and hours for any year with our comprehensive business days calculator. Customize working hours (4h, 8h, 12h per day), include US federal holidays, set custom non-working days, and view detailed monthly and quarterly breakdowns. Perfect for project planning, payroll, and resource allocation.
Calculate days between dates, add or subtract days from any date with our free online date calculator. Supports business days calculation, multiple date formats, and instant results. Perfect for project planning, scheduling, and date arithmetic.
Calculate weeks between dates, add weeks to dates, or subtract weeks from dates with our free online week calculator. Supports both calendar weeks and business weeks (Monday-Friday) with multiple date formats.
Calculate your weighted grades and GPA online for free with our comprehensive grade calculator. Support for percentage, letter grades, and points with advanced features like final exam grade prediction, data export/import, and saved calculations.
Calculate your GPA (Grade Point Average) online for free with our comprehensive GPA calculator. Track multiple semesters, weighted courses, and export your academic data. Supports AP, IB, Honors, and regular courses with automatic calculations.
Resize PDF pages to any standard paper format for free with our secure PDF resizer. Transform documents to A4, Letter, Legal, and more - all processing happens in your browser.
Check color contrast ratios for web accessibility compliance. Test text and background color combinations against WCAG guidelines with real-time preview, accessibility ratings, and improvement suggestions.
Create stunning visual collages by combining your images with extracted color palettes. Upload any image to automatically extract its dominant colors and create beautiful compositions with customizable layouts, styles, and aspect ratios.
Create, view, and manage color palettes with advanced features. Generate palettes using color theory, import from various formats, check accessibility contrast, and export to CSS, SCSS, Tailwind, JSON, or PNG formats.
Merge multiple PDF files into one document for free with our secure PDF merger. Combine PDFs in any order directly in your browser - no uploads required.