Tutorials, deep-dives, and privacy-first thinking about developer tools.
Showing 1–12 of 61 posts
Learn how to test a regex pattern online without writing code: paste, highlight, and debug matches, plus why the same regex passes in Python but fails in JS.
A practical regex cheatsheet for 2026: 25 ready-to-paste patterns for emails, URLs, dates, and log parsing, plus the syntax rules behind them.
Converted a PNG to JPG and the file grew? Here's why JPEG bloats flat graphics and screenshots, and the quick fix that actually shrinks the image.
WebP vs AVIF in 2026: real browser support dates, how much smaller AVIF files get, why AVIF encodes slower, and which format to pick for the web.
Unix timestamp 1700000000 was Tuesday, November 14, 2023, 22:13:20 UTC. Learn how to date any timestamp from its leading digits, no converter needed.
Convert any date to a Unix timestamp in Bash, Python, JavaScript, and SQL with copy-paste one-liners — plus the timezone trap each language hides.
Learn how to convert images to AVIF in the browser, when AVIF beats WebP on file size, and how to ship it safely with a WebP and JPG fallback in 2026.
Convert PNG to WebP to cut image size by roughly 30% with no visible quality loss. A 2026 guide to lossless vs lossy, the Canvas API, and browser support.
Learn how to compare logs across UTC, PST, and JST in one view: normalize to Unix time, then convert cleanly with IANA zone names and ISO 8601.
Postgres extract(epoch from now()) and MySQL UNIX_TIMESTAMP() both return a Unix timestamp, but the data type, precision, and timezone rules differ.
Learn how to convert JPG to PNG in your browser, why it never restores lost quality, and the three cases where converting actually helps instead of bloating files.
Convert PNG to JPG without that surprise black background. Here's why transparent pixels turn black and how to flatten onto the color you actually want.