# SMT Tooling

> Free generators for captions, posts and ad copy, plus handy developer utilities — all in one place.

Every tool and article on SMT Tooling is free to use — no sign-up required. The links below are the primary, canonical resources on this site.

## Tools

- [Instagram Caption Generator](https://www.smttooling.com/tool/instagram-caption-generator/): Generate engaging Instagram captions with hashtags and CTAs. Enter your photo topic and get ready-to-post caption options.
- [Twitter Thread Generator](https://www.smttooling.com/tool/twitter-thread-generator/): Turn content into viral Twitter/X threads. Get structured hooks, numbered tweets, and closing CTAs for maximum engagement.
- [LinkedIn Post Generator](https://www.smttooling.com/tool/linkedin-post-generator/): Create professional LinkedIn posts that build your personal brand. Choose storytelling, educational, or opinion formats.
- [TikTok Script Writer](https://www.smttooling.com/tool/tiktok-script-writer/): Write TikTok video scripts with hooks, content structure, and trending format suggestions for short-form video.
- [Facebook Ad Copy Generator](https://www.smttooling.com/tool/facebook-ad-copy-generator/): Generate high-converting Facebook and Instagram ad copy. Get primary text, headline, and description optimized for conversions.
- [Pinterest Pin Description](https://www.smttooling.com/tool/pinterest-pin-description/): Write SEO-optimized Pinterest pin descriptions with keywords. Drive more traffic from Pinterest to your website.
- [YouTube Description Generator](https://www.smttooling.com/tool/youtube-description-generator/): Create YouTube video descriptions with keywords, timestamps, and structured sections for better search ranking.
- [Email Subject Line Generator](https://www.smttooling.com/tool/email-subject-line-generator/): Generate email subject lines tested for open rates. Get options optimized for length, curiosity, and personalization.
- [Brand Voice Analyzer](https://www.smttooling.com/tool/brand-voice-analyzer/): Analyze your brand voice across content. Get a voice profile with consistency recommendations for all platforms.
- [Engagement Rate Calculator](https://www.smttooling.com/tool/engagement-rate-calculator/): Calculate social media engagement rates and benchmark against industry averages. Track performance across platforms.
- [JSON Formatter & Validator](https://www.smttooling.com/tool/json-formatter-validator/): Free browser-based JSON Formatter & Validator. Beautify, minify, and validate JSON instantly with syntax error highlighting and adjustable indentatio…
- [Base64 Encoder / Decoder](https://www.smttooling.com/tool/base64-encoder-decoder/): Free Base64 encoder and decoder — convert text or files to/from Base64 instantly. Supports URL-safe mode, live byte counts, and Unicode. No upload ne…
- [JWT Decoder](https://www.smttooling.com/tool/jwt-decoder/): Decode JWT tokens instantly in your browser. Inspect header, payload claims, algorithm, expiry, and issued-at time — fully offline, nothing sent to a…
- [URL Encoder / Decoder](https://www.smttooling.com/tool/url-encoder-decoder/): Free URL encoder and decoder tool. Percent-encode or decode full URIs and query string components instantly, with clear mode switching and copy suppo…
- [UUID & GUID Generator](https://www.smttooling.com/tool/uuid-guid-generator/): Free UUID & GUID generator — bulk generate v1, v4, v7 UUIDs with uppercase, hyphen, and bracket options. Instant copy, no server needed.
- [Hash Generator (MD5/SHA)](https://www.smttooling.com/tool/hash-generator/): Free client-side hash generator. Compute MD5, SHA-1, SHA-256, and SHA-512 digests from text or files instantly in your browser.
- [Regex Tester & Explainer](https://www.smttooling.com/tool/regex-tester/): Test regular expressions live with match highlighting, capture groups, flag toggles, and plain-English explanations of every regex token. No sign-up …
- [Cron Expression Builder](https://www.smttooling.com/tool/cron-expression-builder/): Visual cron expression builder with human-readable previews. Build or decode any cron schedule and see the next 10 run times instantly.
- [JSON to TypeScript Converter](https://www.smttooling.com/tool/json-to-typescript/): Convert JSON to TypeScript interfaces instantly. Handles nested objects, arrays, optional/null fields, and union types. Free, client-side, no signup …
- [Color Converter (HEX/RGB/HSL)](https://www.smttooling.com/tool/color-converter/): Convert colors between HEX, RGB, HSL, and HSV instantly. Live preview swatch, copy buttons, and bidirectional conversion — free, fast, no install nee…
- [Diff Checker](https://www.smttooling.com/tool/diff-checker/): Compare two blocks of text or code with line-level and character-level diff highlighting. Free, instant, browser-only — no data leaves your device.
- [Slug & Case Converter](https://www.smttooling.com/tool/slug-case-converter/): Convert text between camelCase, snake_case, kebab-case, PascalCase, and URL slugs instantly. Free online case converter with one-click copy.

## Articles

- [Get a Number and Start Calling Today: g100.us](https://www.smttooling.com/start-calling-today-g100us/): Get a number and start calling today with g100.us — instant business phone numbers for calls, SMS & WhatsApp in 100+ countries, from $4/week.
- [How to Hide Your Real Number on Calls: g100.us Guide](https://www.smttooling.com/hide-real-number-calls-g100us/): Learn how to hide your real number on calls using a dedicated g100.us business number for calls, SMS, and WhatsApp — private, instant, flat pricing.
- [Naming Things: The Quiet Battle Over Case Conventions](https://www.smttooling.com/naming-case-conventions-editorial/): Why the snake_case vs camelCase debate never ends — and what enforcing a naming convention actually buys your codebase. An editorial take on the quie…
- [How a Bad Diff Reaches Production (and How to Prevent It)](https://www.smttooling.com/bad-diff-production-release-case-study/): Picture a Thursday afternoon at a mid-sized fintech startup. A senior backend engineer approves what looks like a routine dependency update. Forty-ei…
- [The State of TypeScript Adoption in 2026](https://www.smttooling.com/typescript-adoption-2026/): A few years ago, persuading a team to adopt TypeScript often meant a drawn-out internal debate, complete with skeptics who saw it as ceremony for lit…
- [A Step-by-Step Guide to Writing Your First Cron Job](https://www.smttooling.com/first-cron-job-tutorial/): Learn to write your first cron job step by step — build a 5-field expression, install it, verify it, and avoid common scheduling pitfalls like timezo…
- [How a Single Bad Regex Can Take Down an API (ReDoS Explained)](https://www.smttooling.com/regex-that-broke-our-api/): Here's a scenario many engineers will recognize. A monitoring dashboard suddenly lights up like a Christmas tree. Response times spike from 80ms to 4…
- [Is MD5 Really Dead? Separating Hash Hype From Reality](https://www.smttooling.com/is-md5-really-dead/): MD5 is broken for cryptographic use — but not for checksums or caching. Learn when the 'never use MD5' advice is right, and when it's missing crucial…
- [UUID v4 vs v7: Which Should You Actually Use?](https://www.smttooling.com/uuid-v4-vs-v7/): UUID v4 vs v7: compare random vs time-ordered UUIDs on index performance, sortability, collision odds, and when each format is the right choice.
- [Stop Double-Encoding Your URLs: A Field Guide](https://www.smttooling.com/stop-double-encoding-urls/): Learn when to use encodeURIComponent vs encodeURI, why double-encoding silently corrupts query params, and how to encode URLs correctly every time.
- [10 Things Every Developer Gets Wrong About JWTs](https://www.smttooling.com/10-jwt-mistakes-developers-make/): Avoid common JWT security mistakes: signing vs encryption, localStorage dangers, alg:none attacks, expiry errors, and why decoded payloads aren't tru…
- [Base64 Explained Like You're Five](https://www.smttooling.com/base64-explained-eli5/): Learn what Base64 actually does, how it works, why it's not encryption, and where it shows up in real developer work — explained in plain English.
- [Why Your JSON Keeps Breaking (And How a Formatter Saves You)](https://www.smttooling.com/why-json-keeps-breaking/): Learn why JSON keeps breaking in production — trailing commas, unescaped quotes, invalid numbers — and how a JSON formatter catches these bugs before…
- [Email Subject Lines — 20 Proven Formulas That Work](https://www.smttooling.com/email-subject-lines-proven-formulas/): Facebook ad copy best practices. PAS framework, AIDA model, and A/B testing strategies for higher conversion rates.
- [Social Media Engagement — How to Calculate and Improve It](https://www.smttooling.com/social-media-engagement-calculate-improve/): TikTok script writing guide. Hook templates, video pacing, trending formats, and algorithm optimization tips.
- [LinkedIn Content Strategy — Posts That Get Engagement](https://www.smttooling.com/linkedin-content-strategy-engagement/): LinkedIn content strategy guide. Post types, algorithm tips, and engagement tactics for professional networking.
- [Twitter Thread Strategy — How to Go Viral in 2026](https://www.smttooling.com/twitter-thread-strategy-go-viral/): Twitter thread mastery guide. How to structure threads, write hooks, and grow your audience with threaded content.
- [Instagram Caption Ideas — 50 Templates for Every Niche](https://www.smttooling.com/instagram-caption-ideas-templates/): Instagram caption writing guide. Hook formulas, hashtag strategy, CTA types, and examples of high-engagement captions.

## About & Policies

- [About Us](https://www.smttooling.com/about-us/)
- [Contact Us](https://www.smttooling.com/contact-us/)
- [Privacy Policy](https://www.smttooling.com/privacy-policy/)
- [Terms of Service](https://www.smttooling.com/terms-of-service/)
- [Disclaimer](https://www.smttooling.com/disclaimer/)
- [Blog](https://www.smttooling.com/blog/)

## Notes

- Full URL list: https://www.smttooling.com/sitemap.xml
- Content is original and maintained by SMT Tooling. Attribution is appreciated when cited.