# Dev Security Tools > A focused toolkit of client-side security utilities: MD5/SHA hashing, HMAC signing, bcrypt, file checksums, CRC32 and cryptographically secure token generation. Every tool and article on Dev Security Tools is free to use — no sign-up required. The links below are the primary, canonical resources on this site. ## Tools - [Engagement Rate Calculator](https://smttooling.click/tool/engagement-rate-calculator/): Why Your Follower Count Is Lying to You There's a moment every creator or brand manager experiences at some point: you stare at an account with 800,0… - [Brand Voice Analyzer](https://smttooling.click/tool/brand-voice-analyzer/): How a SaaS Startup Used Brand Voice Analyzer to Stop Sounding Like Everyone Else When Miriam Castillo joined a bootstrapped project management startu… - [Email Subject Line Generator](https://smttooling.click/tool/email-subject-line-generator/): What an Email Subject Line Generator Actually Does (And Why Developers Should Care) If you've built a transactional email system, a newsletter platfo… - [YouTube Description Generator](https://smttooling.click/tool/youtube-description-generator/): What Is a YouTube Description Generator, Really? If you've ever stared at that blank description box after uploading a video, you already know the pr… - [Pinterest Pin Description](https://smttooling.click/tool/pinterest-pin-description/): What Is the Pinterest Pin Description Tool and Why Should Developers Care? If you have ever watched a perfectly designed pin disappear into the void … - [Facebook Ad Copy Generator](https://smttooling.click/tool/facebook-ad-copy-generator/): What Is the Facebook Ad Copy Generator and Why Do Marketers Actually Use It? The Facebook Ad Copy Generator is an AI-powered tool designed specifical… - [TikTok Script Writer](https://smttooling.click/tool/tiktok-script-writer/): TikTok Script Writer: The Tool That Finally Gets How Short-Form Video Actually Works Let's be honest — staring at a blank screen trying to write a Ti… - [LinkedIn Post Generator](https://smttooling.click/tool/linkedin-post-generator/): LinkedIn Post Generator: What It Actually Does and Why Developers Keep Coming Back to It There is a particular kind of irony in the developer communi… - [Twitter Thread Generator](https://smttooling.click/tool/twitter-thread-generator/): What Is a Twitter Thread Generator and Why Developers Actually Need One If you've ever tried to explain a technical concept on Twitter — a design pat… - [Instagram Caption Generator](https://smttooling.click/tool/instagram-caption-generator/): The Night I Stopped Staring at a Blinking Cursor It was 11:47 PM on a Tuesday when I realized I had spent forty-three minutes trying to write a capti… - [Hash Generator (MD5, SHA-1, SHA-256, SHA-512)](https://smttooling.click/tool/hash-generator/): Free browser-based hash generator. Compute MD5, SHA-1, SHA-256, SHA-384, and SHA-512 digests instantly from any text using the Web Crypto API — no up… - [UUID Generator (v1, v4, v7)](https://smttooling.click/tool/uuid-generator/): Free online UUID generator supporting v1 (time-based), v4 (random), and v7 (sortable) formats. Generate up to 100 UUIDs at once with uppercase/lowerc… - [HMAC Signature Generator](https://smttooling.click/tool/hmac-generator/): Free browser-based HMAC signature generator. Compute HMAC-SHA256, HMAC-SHA1, and HMAC-SHA512 signatures instantly using the Web Crypto API — output a… - [File Checksum Verifier](https://smttooling.click/tool/file-checksum-verifier/): Free client-side file checksum verifier. Drag in any file to compute SHA-256 or MD5 hashes instantly, then compare against an expected value with a c… - [Bcrypt Hash Generator & Checker](https://smttooling.click/tool/bcrypt-generator/): Free browser-based bcrypt hash generator and checker. Adjust cost factor 4–14, generate secure hashes, and verify passwords against existing bcrypt h… - [CRC32 & Adler-32 Checksum Calculator](https://smttooling.click/tool/crc32-calculator/): Free online CRC32, CRC32C, and Adler-32 checksum calculator. Paste text or hex bytes, get instant results with zero server calls. Explains each algor… - [.env File Validator & Formatter](https://smttooling.click/tool/env-file-validator/): Free .env file validator: detect duplicate keys, invalid names, unquoted spaces, and trailing whitespace. Export a clean, CI-ready formatted .env in … - [Cron Expression Builder & Explainer](https://smttooling.click/tool/cron-expression-builder/): Free online cron expression builder and explainer. Create cron schedules with dropdowns or paste an expression to get plain-English explanation and n… - [Semantic Version Bumper](https://smttooling.click/tool/semver-bumper/): Free online Semantic Version Bumper — preview major, minor, patch, or prerelease bumps and test SemVer range compatibility (^, ~, >=) instantly in yo… - [Random Token & API Key Generator](https://smttooling.click/tool/random-token-generator/): Free browser-based random token and API key generator. Cryptographically secure (CSPRNG), hex/Base64url/alphanumeric, custom length. No server, no tr… - [Dockerfile Linter & Best-Practices Checker](https://smttooling.click/tool/dockerfile-linter/): Free Dockerfile linter that checks for unpinned tags, root user, broken apt-get/pip layers, ADD vs COPY, missing HEALTHCHECK, and more — with actiona… - [YAML / JSON Config Converter & Validator](https://smttooling.click/tool/yaml-json-converter/): Free online YAML to JSON converter and JSON to YAML converter with instant validation and error line numbers. Perfect for Kubernetes manifests, CI co… ## Articles - [Do I Need a Business Number? Yes — Here's Why](https://smttooling.click/do-i-need-business-number-g100us/): Do I need a business number? Short answer: yes. See why, and how g100.us gets you one with calls, SMS & WhatsApp in seconds. - [Best Business Phone Number for Solopreneurs: g100.us](https://smttooling.click/best-business-number-solopreneurs-g100us/): Looking for a business number for solopreneurs? g100.us gives you calls, SMS & WhatsApp on one number, 100+ countries, instant activation, no contrac… - [CRC32, Adler-32 and SHA: Choosing the Right Checksum for the Job](https://smttooling.click/crc32-vs-cryptographic-hashes/): When to use CRC32 vs SHA-256: a technical deep dive into checksum mechanics, threat models, and the right tool for error detection, software distribu… - [Generating Secure API Keys: A Q&A for Backend Developers](https://smttooling.click/generating-secure-api-keys-qa/): Learn how to generate secure API keys: CSPRNGs vs Math.random, entropy, key length, prefixes, hashing for storage, and rotation strategies for backen… - [7 .env Mistakes That Break Your CI Pipeline](https://smttooling.click/env-file-mistakes-breaking-ci/): Unquoted values, CRLF endings, duplicate keys, secret leaks — 7 real .env file mistakes that break CI pipelines and exactly how to fix each one. - [Semantic Versioning Explained: What ^, ~ and >= Really Mean](https://smttooling.click/semantic-versioning-ranges-explained/): Understand what ^, ~, and >= really mean in SemVer, how package resolvers use them, and how to stop CI from pulling in accidental breaking updates. - [Cracking Cron: An ELI5 Guide to the Five Fields](https://smttooling.click/cron-syntax-explained-eli5/): Learn cron syntax the easy way — a plain-English breakdown of all five fields, common gotchas, and timezone pitfalls in GitHub Actions and other CI t… - [The Myth That Hashing Is Encryption (And Why It Matters)](https://smttooling.click/hashing-is-not-encryption-myth/): Hashing is not encryption. Learn the real difference, why it matters for security, and the common mistakes developers make when they mix them up. - [Stop Storing Passwords Wrong: A Plain-English Guide to Bcrypt](https://smttooling.click/bcrypt-password-hashing-explained/): Learn why SHA-256 is dangerous for passwords and how bcrypt's salting and cost factor protect users. Practical guide with Node, Python, and PHP examp… - [How to Verify a Downloaded File's Checksum (Step by Step)](https://smttooling.click/how-to-verify-file-checksum/): Learn how to verify a downloaded file's SHA-256 checksum on macOS, Linux, and Windows using built-in tools — step-by-step with copy-paste commands. - [UUID v4 vs v7: Why Your Database Will Thank You for Switching](https://smttooling.click/uuid-v4-vs-v7-database-performance/): Learn why UUID v4 fragments B-tree indexes and how UUID v7's time-ordered design restores insert locality — with benchmark reasoning and migration gu… - [MD5 vs SHA-256: Which Hash Should You Actually Use in 2026?](https://smttooling.click/md5-vs-sha256-which-hash-to-use/): MD5 vs SHA-1 vs SHA-256 in 2026: speed benchmarks, collision resistance, and exactly where each hash belongs — including where MD5 is now actively da… ## About & Policies - [About Us](https://smttooling.click/about-us/) - [Contact Us](https://smttooling.click/contact-us/) - [Terms of Service](https://smttooling.click/terms-of-service/) - [Disclaimer](https://smttooling.click/disclaimer/) - [Privacy Policy](https://smttooling.click/privacy-policy/) ## Notes - Full URL list: https://smttooling.click/sitemap.xml - Content is original and maintained by Dev Security Tools. Attribution is appreciated when cited.