Security week meets visual computing week.
Thirty-three new tools. Five blog posts. Eight of those tools are security-focused, five are interactive algorithm visualizers, and one lets you hide secret messages inside images. Yeah, steganography. In your browser. Let's go.
Security & Cryptography (eight new)
Last week we added AES, BCrypt, and RSA. This week I went deeper. Way deeper.
- Steganography Tool — hide secret messages inside images using LSB encoding. Extract hidden text from stego images. All in the browser. Try it →
- Shamir's Secret Sharing — split a secret into N shares and reconstruct it with any K of them. Proper GF(256) implementation. Try it →
- Pwned Password Checker — check if your password has been exposed in known breaches via Have I Been Pwned with k-anonymity. Your password never leaves your device. Try it →
- SSL Certificate Decoder — paste a PEM certificate and see every field decoded. Try it →
- CSP Builder — build Content Security Policy headers with a visual editor. Try it →
- Security Headers Generator — generate all recommended security headers in one go. Try it →
- CORS Configuration Helper — configure CORS headers without guessing. Try it →
- Base58 Encoder — encode and decode Base58, the format used by Bitcoin and IPFS. Try it →
Developer Tools (seven new)
The tools every developer Googles at least once a week. Now ad-free and instant.
- Regex Tester — test regular expressions with real-time matching, explanation, and capture groups. Try it →
- Docker Compose Generator — build docker-compose.yml files visually with service configuration. Try it →
- Crontab Generator — generate cron expressions with a human-readable editor. Try it →
- .gitignore Generator — select your stack and get a clean .gitignore. Try it →
- HTML to JSX — convert HTML to valid JSX with className, camelCase, and self-closing tags. Try it →
- JSON to TypeScript — convert any JSON payload to TypeScript interfaces with nested types. Try it →
- SQL Formatter — format and beautify SQL queries with dialect support. Try it →
Visualizers & Logic (five new)
This is the category I'm most proud of this week. Interactive, animated, educational.
- Pathfinding Visualizer — watch A*, Dijkstra, BFS, and DFS solve mazes step by step on an interactive grid. Try it →
- Recursion Tree Visualizer — paste a recursive function, run it, and see the call tree with memoization overlay. Try it →
- Big O Complexity Comparator — visualize and compare complexity curves from O(1) to O(n!) on an interactive chart. Try it →
- Database Schema Designer — design ER diagrams visually, parse SQL DDL, and export CREATE TABLE statements. Try it →
- CSS Box Model Visualizer — see margin, border, padding, and content in real time as you tweak values. Try it →
Data & Coding (four new)
- Fake Data Generator — generate realistic test data with faker.js; 5 schemas, up to 1000 rows, export as JSON, CSV, or SQL. Try it →
- Image to Base64 — convert any image to a Base64 data URI. Try it →
- JSON to CSV — flatten nested JSON into a clean CSV. Try it →
- Markdown Table Generator — build Markdown tables visually and copy the output. Try it →
Image & Design (three new)
- Interactive 360 Photo Viewer — upload equirectangular panoramas and explore them in a 3D viewer. Try it →
- QR Code Generator — create custom QR codes and scan existing ones. Try it →
- Image Flip & Rotate — flip, rotate, and export images in one click. Try it →
Sport & Performance (three new)
- FFMI Calculator — fat-free mass index with normalized height adjustment and natural limit overlay. Try it →
- Strength Standards Checker — compare your lifts against population benchmarks. Try it →
- VO2 Max Estimator — estimate your aerobic capacity without a lab. Try it →
Design & CSS (two new)
- Color Contrast Checker — WCAG AA/AAA contrast ratio validation with real-time preview. Try it →
- Color Picker — pick colors and convert between HEX, RGB, HSL, and more. Try it →
Finance (one new)
- Inflation Calculator — calculate how inflation erodes purchasing power over time with historical and custom rates. Try it →
From the Blog
Five new posts. Stories first, tools second.
- I Stopped Paying for Subtitle Services After Running Whisper in a Browser Tab — local AI subtitle generation with zero uploads.
- Three Ways to Convert JSON to TypeScript. Only One Is Deterministic. — why your manual approach will break.
- My Friends Spent 14 Minutes Deciding Where to Go Train. A Wheel Spinner Fixed It in 3 Seconds.
- How to Create 360 Panoramas with GPT Image 2 and View Them Interactively — AI-generated panoramas meet the 360 viewer.
- One PR to a Parser Unlocked Prerendering in Brisa — how a JavaScript AST visualizer led to a framework fix.
By the Numbers
470+ tools across 24 categories. Everything runs in your browser. Everything stays on your device.
What's Next
Receipt Generator, NDA Generator, Contract Generator, Quote/Estimate Generator. Same philosophy: form data, live preview, clean PDF.
Got a tool idea? Reply and suggest it. I build what you ask for.
— Aral