Tutorials, deep-dives, and privacy-first thinking about developer tools.
Showing 25–36 of 38 posts
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.
Remove image backgrounds for free in your browser — no Photoshop install, no uploads, no signup. Works on photos, product shots, logos, and portraits.
Batch-compress JPG, PNG, and WebP images in your browser and download them as a single ZIP — no account, no upload, no quality loss.