Tutorials, deep-dives, and privacy-first thinking about developer tools.
Showing 13–24 of 28 posts
Generate the 1024×1024 App Store icon plus every iPhone, iPad, Spotlight, and Settings size from one PNG. Free, no upload, transparency stripped — ready for App Store Connect in 30 seconds.
An online Markdown viewer that renders MD to HTML in real time — paste, see the formatted preview, copy the HTML or the rendered text. 100% in your browser.
A text-to-QR generator handles more than URLs: encode Wi-Fi, vCard, SMS, mailto, calendar, geo, and payment payloads with proper escaping for 2026.
Apple touch icon generator that builds every iOS, iPadOS, and Safari pinned-tab size from one source — no upload, no sign-up, on-brand in 30 seconds.
Free online mipmap generator — turn one source PNG into every Android density (mdpi → xxxhdpi) plus adaptive icons, ready as a drop-in res/ folder. No Android Studio, no upload.
Trim white margins from any PDF in your browser — no upload, no watermark, no sign-up. Here is exactly how PDF cropping works in 2026.
Merge PDF online for free in your browser — no uploads, no watermarks, no sign-ups. Step-by-step walkthrough plus the trade-offs of browser-only merging in 2026.
Generate QR codes for Wi-Fi networks, contact vCards, and URLs in seconds — covering payload formats, error correction, and design rules for reliable scans.
Verify any download with MD5 or SHA-256 in your terminal, on Windows, or fully in your browser — and learn when MD5 is dangerously weak.
Generate a UUID v4 in one line across browser, Node, Python, and CLI — and learn the three cases where UUID v4 is the wrong identifier to reach for.
Base64 explained with 10 working examples — encode and decode in the browser, terminal, JavaScript, Python, and JWTs. Includes URL-safe variant and the `==` padding rule.
Parse MySQL, PostgreSQL, or SQLite dumps and export them to .xlsx entirely in your browser — no server, no account, no size cap. Full walkthrough.