Free Online Tools for Developers & Freelancers

Calculate your ideal freelance hourly, daily, weekly, and monthly rates based on your target salary.

Calculate the true cost of meetings based on attendees, hourly rates, and duration.

Calculate percentages, percentage change, and percentage of numbers instantly.

Convert annual salary to hourly rate accounting for work hours, vacation, and benefits.

Convert hourly wage to annual salary with overtime and benefits calculations.

Calculate loan payments, total interest, and amortization schedules.

Calculate compound interest with various frequencies and contribution options.

Calculate discounts, sale prices, and savings with percentage or fixed amounts.

Calculate profit margin, cost, and revenue with gross and net margin options.

Calculate markup percentage, selling price, and profit from cost.

Calculate return on investment percentage and annualized returns.

Calculate tips and split bills with custom percentages and party sizes.

Calculate network address, broadcast address, usable hosts, and subnet masks from IP addresses with CIDR notation.

Generate and validate cron expressions with human-readable descriptions and next run times.

Create professional invoices with line items, tax calculations, and PDF download.

Generate placeholder text in paragraphs, sentences, or words. Copy instantly for mockups and designs.

Generate random UUIDs (v4) instantly. Bulk generate up to 50 UUIDs with uppercase/lowercase options.

Generate secure, random passwords with customizable length and character types.

Generate QR codes from any text or URL with customizable size and error correction.

Generate cryptographically secure random numbers within any range.

Generate MD5 hashes from text for checksums and data verification.

Generate secure SHA-256 hashes from text using the Web Crypto API.

Create custom CSS box shadows with live preview and multiple shadow layers.

Create beautiful CSS gradients with linear, radial, and conic options.

Generate harmonious color palettes using color theory principles.

Create custom CSS border radius with individual corner controls.

Generate a full scale of color shades from light to dark.

Visual CSS Flexbox generator with live preview and all flex properties.

Visual CSS Grid generator with column/row controls and cell spanning.

Create frosted glass UI effects with backdrop blur and transparency.

Create soft UI neumorphic effects with automatic shadow calculation.

Create CSS triangles using the border technique or clip-path.

Create CSS text shadows with multiple layers and preset effects.

Generate favicon files in multiple sizes from an uploaded image. Create all the icons you need for browsers and devices.

Generate placeholder images with custom dimensions, colors, and text for mockups and wireframes.

Build UTM-tagged URLs for campaign tracking. Add source, medium, campaign, term, and content parameters easily.

Generate Open Graph and Twitter Card meta tags for social media sharing. Preview how your content will appear on Facebook, Twitter, and LinkedIn.

Generate HTML meta tags for SEO optimization including title, description, keywords, viewport, and robots directives.

Generate a customized privacy policy for your website with data collection, cookies, and third-party service disclosures.

Generate robots.txt files to control search engine crawlers. Configure user agents, allow/disallow rules, and sitemap URLs.

Generate professional Terms of Service documents for your website or app with customizable sections.

Generate sample PDF files with lorem ipsum content, optional blank and landscape pages, and test-pack downloads.

Generate barcodes in multiple formats including CODE128, EAN-13, EAN-8, UPC-A, and CODE39 with customizable options.

Format, validate, and minify JSON data with syntax highlighting. Copy formatted output instantly.

Convert JSON arrays to CSV format with custom delimiters and download.

Convert CSV data to JSON array format with automatic delimiter detection.

Minify JSON by removing whitespace to reduce file size.

Count words, characters, sentences, and paragraphs. Get reading time estimates instantly.

Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds.

Convert times between timezones instantly. Compare multiple timezones and see current times worldwide.

Encode text to Base64 or decode Base64 to text with full UTF-8 support.

Convert text between uppercase, lowercase, title case, camelCase, snake_case, and more.

Encode and decode URLs and query parameters. Supports encodeURIComponent and encodeURI.

Scan and decode QR codes from images or your device camera. Extract URLs, text, and data instantly.

Convert any text to URL-friendly slugs with custom separators and length limits.

Remove duplicate lines from text with options for case sensitivity and whitespace trimming.

Sort lines alphabetically, numerically, or naturally with options for case and duplicates.

Reverse text by characters, words, word order, or lines instantly.

Remove extra whitespace, trim lines, and clean up text formatting.

Test and debug regular expressions with real-time matching and highlighting.

Decode and inspect JSON Web Tokens to view header, payload, and expiration.

Encode special characters to HTML entities or decode entities back to text.

Compare two texts and highlight additions, deletions, and changes.

Convert numbers between binary, octal, decimal, and hexadecimal.

Write and preview Markdown with live rendering and formatting toolbar.

Parse URLs to extract protocol, host, path, query parameters, and more.

Convert colors between HEX, RGB, HSL, and HSV formats instantly.

Convert SVG images to PNG format with custom dimensions, scaling, and background options.

Convert images to Base64 encoded strings for embedding in HTML, CSS, or JSON.

Compress images client-side with adjustable quality. Reduce file sizes instantly without uploading.

Extract colors from any image by clicking on pixels. Get HEX, RGB, and HSL values instantly.

Convert Base64 strings back to downloadable images. Preview and download images from Base64 data URLs.

Resize images to any dimension while maintaining quality. Supports JPG, PNG, and WebP formats.

Crop images client-side with visual selection, preset aspect ratios, and instant download.

Convert PNG images to JPG format with adjustable quality and background color for transparent areas.

Convert JPG/JPEG images to PNG format instantly. Client-side conversion with batch support.

Analyze keyword frequency and density in your text. View word counts, percentages, and filter common stop words.

Preview how your page will appear in Google search results with real-time character counters and truncation warnings.

Preview how your content will appear when shared on Twitter/X. Generate meta tags for summary and large image cards.

Parse user agent strings to identify browser, operating system, device type, and rendering engine.

Convert between bytes, kilobytes, megabytes, gigabytes, and more. Supports both binary (1024) and decimal (1000) standards.

Merge PDF files, reorder documents and pages, rotate or delete pages, and export optimized output entirely in your browser.

Create encrypted, self-destructing notes that disappear after being read. End-to-end encrypted with optional password protection.