Blog
Guides, deep dives and practical notes on the problems these tools solve.
39 articles
- Compress, trim and convert video in the browser with FFmpeg WASM
How ffmpeg.wasm makes real video editing possible client-side, which presets to use for smaller files, and where the limits are.
6 min readvideoffmpegguide - OpenSSL commands and key formats, explained without the man page
CSRs, self-signed certificates, PEM vs DER vs PKCS#8 vs JWK, and how to check what a certificate actually contains.
7 min readsecuritytlsguide - How to make code screenshots people actually read
Font size, padding, line count and contrast decide whether a snippet lands on social or gets scrolled past. A practical checklist.
5 min readdesigndocumentation - Electronic signatures without uploading your documents
What a signature image really is, why transparency matters, and how to produce one that drops cleanly into a contract or PDF.
4 min readprivacyproductivity - Word clouds that actually say something useful
Stop-words, stemming and scale distortion decide whether a word cloud is insight or decoration. How to read and build a good one.
4 min readtextdata - Testing APIs from the browser: what works, what CORS blocks, and why
How a browser-based REST client sends real requests, why some endpoints fail with a CORS error, and how to work around it without installing anything.
6 min readapihttpcors - Debugging WebSockets: handshake, close codes, and reading a transcript
How to test a ws:// or wss:// endpoint from the browser, and what the common close codes actually mean.
5 min readwebsocketrealtimedebugging - How images become a PDF — entirely inside your browser
The anatomy of a PDF page, why JPEG is embedded directly, and how to pick between A4 and fit-to-image output.
5 min readpdfimagesprivacy - Regex lookahead and lookbehind in practice
What (?=...), (?!...), (?<=...) and (?<!...) actually do, with real patterns for passwords, numbers and text extraction.
8 min readregexguide - Understanding CORS errors and how to fix them
Why 'No Access-Control-Allow-Origin header' shows up, what the browser is actually enforcing, and the exact headers that fix each case.
8 min readhttpcorsguide