# DevToolVault - Privacy-First Developer Tools > Comprehensive suite of browser-based utility tools for Developers, AI Engineers, and SEO Specialists. > 90%+ client-side processing. No data collection. No tracking. ## Site Structure ### Main Pages - https://devtoolvault.app/: Home - Browse all developer tools and utilities - https://devtoolvault.app/about: About DevToolVault - Mission, features, and FAQ - https://devtoolvault.app/privacy: Privacy Policy - Data handling and privacy commitment - https://devtoolvault.app/terms: Terms of Service - Usage terms and conditions ### Tool Categories - https://devtoolvault.app/tools/ai: AI & Future Tech Tools - Token counters, cost estimators, prompt generators - https://devtoolvault.app/tools/developer: Developer Tools - Code formatters, validators, converters - https://devtoolvault.app/tools/images: Image Tools - Compression, conversion, resizing, cropping - https://devtoolvault.app/tools/seo: SEO Tools - Meta tags, sitemaps, robots.txt, keyword analysis ## AI & Future Tech Tools (/tools/ai) - https://devtoolvault.app/tools/ai-token-counter: AI Token Counter - Count tokens for GPT-4, Claude, and other LLMs - https://devtoolvault.app/tools/llm-cost-estimator: LLM API Cost Estimator - Calculate costs for OpenAI, Anthropic, Google AI - https://devtoolvault.app/tools/json-to-jsonl: JSON to JSONL Converter - Convert JSON arrays to JSONL format for AI fine-tuning - https://devtoolvault.app/tools/json-toon-converter: JSON to TOON Converter - Convert between JSON and TOON formats for AI training - https://devtoolvault.app/tools/text-chunker: Text Chunker for Vector DBs - Split text into chunks for embeddings and RAG ## Developer Tools (/tools/developer) - https://devtoolvault.app/tools/code-formatter: Code Formatter - Prettify or minify JSON, HTML, XML - https://devtoolvault.app/tools/json-validator: JSON Validator - Validate JSON syntax with error detection - https://devtoolvault.app/tools/json-yaml-converter: JSON/YAML Converter - Convert between JSON and YAML formats - https://devtoolvault.app/tools/code-differ: Code Differ - Compare code side-by-side with diff highlighting - https://devtoolvault.app/tools/regex-tester: Regex Tester - Test regular expressions with real-time matching - https://devtoolvault.app/tools/base64: Base64 Encoder/Decoder - Encode and decode Base64 text - https://devtoolvault.app/tools/url-encoder: URL Encoder/Decoder - Encode and decode URL strings - https://devtoolvault.app/tools/uuid-generator: UUID Generator - Generate v4 UUIDs - https://devtoolvault.app/tools/password-generator: Password Generator - Generate secure random passwords ## Image Tools (/tools/images) Note: Image tools pages are category pages. Individual image tools are client-side only. - https://devtoolvault.app/tools/images: Image Tools Hub - Access all image utilities - https://devtoolvault.app/tools/image-compressor: Image Compressor - Compress JPEG, PNG, WebP images locally with privacy - https://devtoolvault.app/tools/background-remover: Background Remover - Remove backgrounds from images using AI ## SEO Tools (/tools/seo) - https://devtoolvault.app/tools/meta-tag-generator: Meta Tag Generator - Create SEO-optimized meta tags - https://devtoolvault.app/tools/keyword-density: Keyword Density Checker - Analyze keyword frequency in content - https://devtoolvault.app/tools/robots-txt-generator: Robots.txt Generator - Generate robots.txt for search engines - https://devtoolvault.app/tools/sitemap-generator: Sitemap Generator - Create XML sitemaps - https://devtoolvault.app/tools/backlink-checker: Backlink Checker - Analyze backlinks and domain authority - https://devtoolvault.app/tools/redirect-checker: Redirect Checker - Check HTTP status codes and redirects ## Blog - https://devtoolvault.app/blog: Blog - Developer guides, tutorials, and insights on AI, SEO, and web development ### Blog Posts (44 articles) - https://devtoolvault.app/blog/how-to-compress-images-web-without-losing-quality: "How to Compress Images for the Web Without Losing Quality" Published: 2025-12-04 | Author: DevToolVault Team Tags: Web Performance, Image Optimization, SEO, Core Web Vitals Learn the best techniques for optimizing images for your website using our free Image Compressor tool. Improve load times and SEO scores instantly. Related Tool: https://devtoolvault.app/tools/image-compressor - https://devtoolvault.app/blog/why-client-side-image-compression-better-privacy: "Why Client-Side Image Compression is Better for Privacy" Published: 2025-12-03 | Author: DevToolVault Team Tags: Privacy, Security, Web Technology Stop uploading your personal photos to random servers. Discover why browser-based compression is the safest way to optimize your images. Related Tool: https://devtoolvault.app/tools/image-compressor - https://devtoolvault.app/blog/how-to-count-tokens-gpt4-claude: "How to Count Tokens for GPT-4 and Claude with DevToolVault" Published: 2025-11-27 | Author: DevToolVault Team Tags: AI, Token Counting, GPT-4, Claude Learn how to accurately count tokens for major LLMs like GPT-4 and Claude 3.5 Sonnet using our privacy-first AI Token Counter. Related Tool: https://devtoolvault.app/tools/ai-token-counter - https://devtoolvault.app/blog/why-token-counting-is-critical-llm-cost-management: "Why Token Counting is Critical for LLM Cost Management" Published: 2025-11-26 | Author: DevToolVault Team Tags: AI, Cost Management, LLM, Optimization Discover why accurate token counting is the secret weapon for controlling your AI infrastructure costs and optimizing model performance. Related Tool: https://devtoolvault.app/tools/ai-token-counter - https://devtoolvault.app/blog/how-to-check-backlinks-free: "How to Check Backlinks for Free with DevToolVault" Published: 2025-11-25 | Author: DevToolVault Team Tags: SEO, Backlinks, Link Building, Analysis A step-by-step guide to analyzing your website's backlink profile using our free, privacy-focused Backlink Checker tool. Related Tool: https://devtoolvault.app/tools/backlink-checker - https://devtoolvault.app/blog/importance-of-backlink-analysis-seo: "The Importance of Backlink Analysis for SEO Success" Published: 2025-11-24 | Author: DevToolVault Team Tags: SEO, Strategy, Ranking Factors Understand why backlinks remain one of the most important ranking factors in 2025 and how to analyze them effectively. Related Tool: https://devtoolvault.app/tools/backlink-checker - https://devtoolvault.app/blog/base64-encoding-decoding-explained: "Base64 Encoding and Decoding Explained: A Developer's Guide" Published: 2025-11-23 | Author: DevToolVault Team Tags: Developer Tools, Base64, Encoding, Web Development Demystifying Base64: What it is, how it works, and how to use our tool to encode and decode data instantly. Related Tool: https://devtoolvault.app/tools/base64 - https://devtoolvault.app/blog/when-to-use-base64-encoding: "When to Use Base64 Encoding in Web Development" Published: 2025-11-22 | Author: DevToolVault Team Tags: Performance, Web Development, Best Practices Base64 is powerful but can be misused. Learn the best use cases and performance implications of using Base64 in your web apps. Related Tool: https://devtoolvault.app/tools/base64 - https://devtoolvault.app/blog/how-to-compare-code-snippets-find-differences: "How to Compare Code Snippets and Find Differences Instantly" Published: 2025-11-21 | Author: DevToolVault Team Tags: Developer Tools, Debugging, Diff, Productivity Debugging a regression? Merging a conflict? Use our Code Differ tool to spot changes between two versions of your code in seconds. Related Tool: https://devtoolvault.app/tools/code-differ - https://devtoolvault.app/blog/why-every-developer-needs-quick-code-diff-tool: "Why Every Developer Needs a Quick Code Diff Tool" Published: 2025-11-20 | Author: DevToolVault Team Tags: Productivity, Workflow, Developer Tools From code reviews to debugging production issues, learn why having a reliable diff tool in your bookmark bar is a productivity hack. Related Tool: https://devtoolvault.app/tools/code-differ - https://devtoolvault.app/blog/clean-up-your-code-using-code-formatter: "Clean Up Your Code: Using the DevToolVault Code Formatter" Published: 2025-11-19 | Author: DevToolVault Team Tags: Developer Tools, Code Quality, Formatting, Productivity Messy code is hard to read and harder to debug. Learn how to instantly beautify your JSON, XML, HTML, and CSS with our Code Formatter. Related Tool: https://devtoolvault.app/tools/code-formatter - https://devtoolvault.app/blog/impact-of-code-formatting-team-productivity: "The Impact of Code Formatting on Team Productivity" Published: 2025-11-18 | Author: DevToolVault Team Tags: Code Quality, Teamwork, Best Practices Code formatting isn't just about aesthetics; it's about communication. Discover how consistent formatting reduces cognitive load and bugs. Related Tool: https://devtoolvault.app/tools/code-formatter - https://devtoolvault.app/blog/preparing-data-finetuning-json-to-jsonl: "Preparing Data for Fine-Tuning: JSON to JSONL Conversion" Published: 2025-11-17 | Author: DevToolVault Team Tags: AI, Fine-Tuning, JSONL, Data Engineering Fine-tuning OpenAI models requires data in JSONL format. Learn how to convert your standard JSON datasets instantly. Related Tool: https://devtoolvault.app/tools/json-to-jsonl - https://devtoolvault.app/blog/why-jsonl-is-standard-large-datasets: "Why JSONL is the Standard for Large Datasets" Published: 2025-11-16 | Author: DevToolVault Team Tags: Data Engineering, Big Data, JSONL From log files to AI training data, JSON Lines (JSONL) is taking over. Here's why data engineers love it. Related Tool: https://devtoolvault.app/tools/json-to-jsonl - https://devtoolvault.app/blog/what-is-toon-format-convert-json: "What is TOON Format and How to Convert JSON to It" Published: 2025-11-15 | Author: DevToolVault Team Tags: AI, Data Formats, TOON, Innovation TOON is a new, efficient data format for AI training. Learn how to convert your existing JSON datasets to TOON. Related Tool: https://devtoolvault.app/tools/json-toon-converter - https://devtoolvault.app/blog/streamlining-ai-training-data-toon: "Streamlining AI Training Data with TOON" Published: 2025-11-14 | Author: DevToolVault Team Tags: AI, Machine Learning, Data Optimization Optimize your machine learning pipelines by adopting the TOON format for your datasets. Related Tool: https://devtoolvault.app/tools/json-toon-converter - https://devtoolvault.app/blog/stop-json-errors-validate-data: "Stop JSON Errors: Validate Your Data Instantly" Published: 2025-11-13 | Author: DevToolVault Team Tags: Developer Tools, JSON, Debugging A missing comma or an extra bracket can crash your app. Use our JSON Validator to catch syntax errors before they cause problems. Related Tool: https://devtoolvault.app/tools/json-validator - https://devtoolvault.app/blog/common-json-syntax-errors-how-to-fix: "Common JSON Syntax Errors and How to Fix Them" Published: 2025-11-12 | Author: DevToolVault Team Tags: JSON, Tutorial, Debugging Deep dive into the most frustrating JSON errors and how to resolve them quickly using our validation tool. Related Tool: https://devtoolvault.app/tools/json-validator - https://devtoolvault.app/blog/json-vs-yaml-which-one-use: "JSON vs. YAML: Which One Should You Use?" Published: 2025-11-11 | Author: DevToolVault Team Tags: DevOps, Configuration, JSON, YAML The battle of data serialization formats. We compare JSON and YAML to help you decide which is best for your project. Related Tool: https://devtoolvault.app/tools/json-yaml-converter - https://devtoolvault.app/blog/converting-between-json-yaml-devops: "Converting Between JSON and YAML for DevOps" Published: 2025-11-10 | Author: DevToolVault Team Tags: DevOps, Kubernetes, Productivity Streamline your DevOps workflow by easily converting Kubernetes manifests and CI/CD configs between JSON and YAML. Related Tool: https://devtoolvault.app/tools/json-yaml-converter - https://devtoolvault.app/blog/mastering-keyword-density-seo: "Mastering Keyword Density for SEO without Keyword Stuffing" Published: 2025-11-09 | Author: DevToolVault Team Tags: SEO, Content Marketing, Keywords Keyword density is a delicate balance. Learn how to optimize your content for search engines without triggering spam filters. Related Tool: https://devtoolvault.app/tools/keyword-density - https://devtoolvault.app/blog/how-to-analyze-content-keyword-strategy: "How to Analyze Your Content's Keyword Strategy" Published: 2025-11-08 | Author: DevToolVault Team Tags: SEO, Competitor Analysis, Strategy Use our Keyword Density tool to audit your competitors and refine your own content strategy. Related Tool: https://devtoolvault.app/tools/keyword-density - https://devtoolvault.app/blog/how-to-estimate-llm-api-costs: "How to Estimate LLM API Costs Before You Build" Published: 2025-11-07 | Author: DevToolVault Team Tags: AI, Cost Management, LLM Don't let API bills surprise you. Learn how to calculate the cost of running LLMs like GPT-4 and Claude 3 at scale. Related Tool: https://devtoolvault.app/tools/llm-cost-estimator - https://devtoolvault.app/blog/gpt4-vs-claude3-cost-comparison: "GPT-4 vs. Claude 3: A Cost Comparison Guide" Published: 2025-11-06 | Author: DevToolVault Team Tags: AI, Comparison, Pricing Which model gives you the best bang for your buck? We compare the pricing of major LLMs to help you choose the right one. Related Tool: https://devtoolvault.app/tools/llm-cost-estimator - https://devtoolvault.app/blog/what-is-llms-txt-why-need-one: "What is llms.txt and Why Your Site Needs One" Published: 2025-11-05 | Author: DevToolVault Team Tags: AI, SEO, Future of Web, llms.txt The web is changing. AI agents are the new users. Learn how llms.txt helps AI understand your website content. Related Tool: https://devtoolvault.app/tools/llms-txt - https://devtoolvault.app/blog/optimizing-documentation-ai-agents-llms-txt: "Optimizing Your Documentation for AI Agents with llms.txt" Published: 2025-11-04 | Author: DevToolVault Team Tags: Documentation, DevRel, AI Make your documentation "AI-readable" to ensure developers using coding assistants get the right answers about your product. Related Tool: https://devtoolvault.app/tools/llms-txt - https://devtoolvault.app/blog/ultimate-guide-meta-tags-seo-2025: "The Ultimate Guide to Meta Tags for SEO in 2025" Published: 2025-11-03 | Author: DevToolVault Team Tags: SEO, Meta Tags, HTML Meta tags are still relevant. Learn which tags actually matter for Google rankings and social sharing in 2025. Related Tool: https://devtoolvault.app/tools/meta-tag-generator - https://devtoolvault.app/blog/generate-perfect-social-media-preview-cards: "How to Generate Perfect Social Media Preview Cards" Published: 2025-11-02 | Author: DevToolVault Team Tags: Social Media, Marketing, SEO Increase your click-through rates from social media by optimizing your Open Graph and Twitter Card meta tags. Related Tool: https://devtoolvault.app/tools/meta-tag-generator - https://devtoolvault.app/blog/password-security-101-generate-strong-passwords: "Password Security 101: How to Generate Strong Passwords" Published: 2025-11-01 | Author: DevToolVault Team Tags: Security, Privacy, Best Practices Length beats complexity. Learn the mathematics of password entropy and how to generate uncrackable passwords. Related Tool: https://devtoolvault.app/tools/password-generator - https://devtoolvault.app/blog/stop-using-password123-immediately: "Why You Should Stop Using "Password123" Immediately" Published: 2025-10-31 | Author: DevToolVault Team Tags: Security, Cybersecurity, Awareness Credential stuffing attacks are on the rise. If you reuse simple passwords, one breach can compromise all your accounts. Related Tool: https://devtoolvault.app/tools/password-generator - https://devtoolvault.app/blog/troubleshooting-redirect-chains-seo: "Troubleshooting Redirect Chains for Better SEO" Published: 2025-10-30 | Author: DevToolVault Team Tags: SEO, Technical SEO, Performance Redirect chains dilute link equity and slow down your site. Learn how to identify and fix them. Related Tool: https://devtoolvault.app/tools/redirect-checker - https://devtoolvault.app/blog/301-vs-302-redirects-when-to-use: "301 vs. 302 Redirects: When to Use Which?" Published: 2025-10-29 | Author: DevToolVault Team Tags: SEO, Web Development, HTTP Using the wrong redirect type can hurt your rankings. We explain the difference between permanent (301) and temporary (302) redirects. Related Tool: https://devtoolvault.app/tools/redirect-checker - https://devtoolvault.app/blog/demystifying-regex-beginners-guide: "Demystifying Regex: A Beginner's Guide to Regular Expressions" Published: 2025-10-28 | Author: DevToolVault Team Tags: Developer Tools, Regex, Tutorial Regular expressions look like gibberish, but they are incredibly powerful. Learn the basics of regex and how to test your patterns. Related Tool: https://devtoolvault.app/tools/regex-tester - https://devtoolvault.app/blog/5-common-regex-patterns-every-developer-should-know: "5 Common Regex Patterns Every Developer Should Know" Published: 2025-10-27 | Author: DevToolVault Team Tags: Regex, Cheatsheet, Productivity Save time by mastering these essential regex patterns for email validation, phone numbers, and more. Related Tool: https://devtoolvault.app/tools/regex-tester - https://devtoolvault.app/blog/robots-txt-explained-controlling-crawlers: "Robots.txt Explained: Controlling How Google Crawls Your Site" Published: 2025-10-26 | Author: DevToolVault Team Tags: SEO, Technical SEO, Robots.txt Your robots.txt file is the gatekeeper of your site. Learn how to use it to guide search engine crawlers effectively. Related Tool: https://devtoolvault.app/tools/robots-txt-generator - https://devtoolvault.app/blog/common-robots-txt-mistakes-kill-seo: "Common Robots.txt Mistakes That Kill Your SEO" Published: 2025-10-25 | Author: DevToolVault Team Tags: SEO, Mistakes, Technical SEO One wrong line in your robots.txt can deindex your entire site. Learn what to avoid. Related Tool: https://devtoolvault.app/tools/robots-txt-generator - https://devtoolvault.app/blog/why-xml-sitemaps-essential-new-websites: "Why XML Sitemaps Are Essential for New Websites" Published: 2025-10-24 | Author: DevToolVault Team Tags: SEO, Sitemap, Indexing Help Google find your content faster. An XML sitemap is a roadmap for search engines. Related Tool: https://devtoolvault.app/tools/sitemap-generator - https://devtoolvault.app/blog/how-to-submit-sitemap-google-search-console: "How to Submit Your Sitemap to Google Search Console" Published: 2025-10-23 | Author: DevToolVault Team Tags: SEO, Google Search Console, Tutorial You generated a sitemap. Now what? Learn how to submit it to Google to speed up indexing. Related Tool: https://devtoolvault.app/tools/sitemap-generator - https://devtoolvault.app/blog/text-chunking-rag-optimizing-vector-search: "Text Chunking for RAG: Optimizing Vector Search" Published: 2025-10-22 | Author: DevToolVault Team Tags: AI, RAG, Vector Database, Text Processing Retrieval Augmented Generation (RAG) relies on good chunks. Learn how to split your text effectively for better AI answers. Related Tool: https://devtoolvault.app/tools/text-chunker - https://devtoolvault.app/blog/strategies-splitting-large-documents-llms: "Strategies for Splitting Large Documents for LLMs" Published: 2025-10-21 | Author: DevToolVault Team Tags: AI, Data Engineering, LLM From overlapping windows to semantic splitting, discover the best techniques for preparing your data for LLMs. Related Tool: https://devtoolvault.app/tools/text-chunker - https://devtoolvault.app/blog/url-encoding-explained-why-percent-20: "URL Encoding Explained: Why %20 Means Space" Published: 2025-10-20 | Author: DevToolVault Team Tags: Web Development, HTTP, URL Ever wonder why URLs look like gibberish? We explain Percent-Encoding and why it keeps the web working. Related Tool: https://devtoolvault.app/tools/url-encoder - https://devtoolvault.app/blog/debugging-url-parameters-encoder-tool: "Debugging URL Parameters with Our Encoder Tool" Published: 2025-10-19 | Author: DevToolVault Team Tags: Debugging, Web Development, API Broken links? API errors? It might be an encoding issue. Learn how to debug complex URLs. Related Tool: https://devtoolvault.app/tools/url-encoder - https://devtoolvault.app/blog/uuid-vs-auto-incrementing-ids: "UUID vs. Auto-Incrementing IDs: Which is Better?" Published: 2025-10-18 | Author: DevToolVault Team Tags: Database, Architecture, UUID Database design debate: Should you use integers (1, 2, 3) or UUIDs for your primary keys? We weigh the pros and cons. Related Tool: https://devtoolvault.app/tools/uuid-generator - https://devtoolvault.app/blog/understanding-uuid-versions-v1-v4-v5: "Understanding UUID Versions: v1, v4, and v5" Published: 2025-10-17 | Author: DevToolVault Team Tags: UUID, Technical Deep Dive, Standards Not all UUIDs are created equal. Learn the differences between the versions and which one you should use. Related Tool: https://devtoolvault.app/tools/uuid-generator ## Special Pages - https://devtoolvault.app/sitemap.xml: XML Sitemap - Dynamically generated sitemap for search engines - https://devtoolvault.app/tools/llms-txt: LLMs.txt Generator - Generate llms.txt files for AI crawlers ## Key Features ### Privacy-First Architecture - 90%+ of operations run entirely in the browser - No server uploads for most tools - No data collection or tracking - GDPR compliant ### Technology Stack - Next.js 16 with React 19 - TypeScript for type safety - Tailwind CSS for styling - Client-side processing with Web APIs ### Tool Categories Summary - **AI Tools**: 5 tools for AI engineers and ML practitioners - **Developer Tools**: 9 tools for code formatting, validation, and conversion - **Image Tools**: Multiple tools for image optimization and manipulation - **SEO Tools**: 6 tools for search engine optimization ## Contact & Support For questions, feedback, or support, visit the About page or use the contact information provided there. ## Technical Details - **Framework**: Next.js 16 (App Router) - **Rendering**: Static generation with client-side interactivity - **Deployment**: Optimized for Vercel/Netlify - **PWA Support**: Progressive Web App with offline capabilities - **Responsive**: Mobile-first design, works on all devices ## License & Usage All tools are free to use for personal, commercial, or enterprise projects without restrictions. No usage limits or rate limiting. --- Last Updated: 2025-12-07 Base URL: https://devtoolvault.app ## About This File This llms.txt file provides structured documentation for AI crawlers and LLMs. For the human-readable version with generator tool, visit: https://devtoolvault.app/tools/llms-txt