Dev Tools for Freelance Developers
Freelance developers wear every hat at once — developer, designer, project manager, and business owner. You need tools that are fast, free, and cover a wide range of needs: generating client-ready documentation, optimizing images for client sites, validating payment data, formatting and converting data in whatever format the client uses, and quickly generating QR codes or slugs for marketing assets. This curated collection covers the full breadth of a freelancer's day-to-day technical tasks.
Pretty-print and format JSON with proper indentation.
Compress images by adjusting JPEG quality to reduce file size without leaving your browser.
Resize images to exact dimensions with optional aspect ratio lock, entirely in your browser.
Convert JPEG images to WebP format with a quality slider — runs entirely in your browser.
Generate a scannable QR code from any text or URL and download as PNG.
Generate Code 128 barcodes from text and download as PNG.
Convert text to a URL-friendly slug instantly.
Generate Lorem Ipsum placeholder text for mockups and prototypes.
Generate colored placeholder images with custom dimensions and labels.
Generate a well-structured README.md from a simple form.
Generate a template-based privacy policy for your website.
Generate a template-based Terms of Service for your website.
Generate HTML meta tags including Open Graph and Twitter Card.
Create Open Graph social media preview images (1200×630) with custom text.
Preview how your page looks when shared on Facebook and LinkedIn.
Build a robots.txt file with rules, sitemap, and common presets.
Generate an XML sitemap from a list of URLs.
Validate credit card numbers using the Luhn algorithm and detect card type.
Run the Luhn (mod 10) algorithm on any number with step-by-step breakdown.
Format monetary amounts correctly for 30+ currencies with proper symbols and decimals.
Format monetary amounts correctly for 30+ currencies with proper symbols and decimals.
Generate complementary, triadic, analogous and other color schemes from one hex color.
FAQ
- How do I quickly generate placeholder content for client mockups?
- Lorem Ipsum generates customizable placeholder text. Placeholder Image Generator creates images in any size and color with text labels. Fake Data Generator provides realistic user data for UI mockups that need sample content.
- How do I set up basic SEO for a client site quickly?
- Meta Tag Generator creates the full set of head meta tags for title, description, OpenGraph, and Twitter Cards. OG Preview shows how the page will look when shared on social media. Robots.txt Generator and Sitemap Generator handle technical SEO configuration.
- How do I validate payment card data for a client e-commerce integration?
- Credit Card Validator checks card numbers with Luhn algorithm validation and identifies the card type (Visa, Mastercard, Amex). For testing payment integrations, Stripe Test Cards and PayPal Test Cards provide valid test numbers for each payment processor.