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How to Split PDF Files Online: Extract Pages in Seconds
Split PDF files online for free with Toolz.dev. Extract specific pages, split by range, or divide large PDFs instantly. No upload required - 100% browser-based.
Unix Timestamp Converter: Epochs, Timezones, and the Year-57123 Bug
Convert Unix timestamps to readable dates and back. Seconds vs milliseconds, timezone handling, the Y2038 limit — and the renewal-date bug that taught me all of
Client-Side Tools and Data Privacy: Where Your Paste Actually Goes
Every paste into an online tool is a trust decision. A plugin developer explains server-side vs client-side processing, how to verify a tool in 30 seconds, and
HEX vs RGB vs HSL: Which Color Format to Use
Convert colors between HEX, RGB, HSL and OKLCH, and check WCAG contrast before you ship. The brand-color mistake I made, and how HSL fixes hover states. On tool
Linear vs Radial vs Conic Gradients in CSS
Build linear, radial and conic CSS gradients with a live preview. Learn the 0deg angle trap, the transparent-fade bug, and how to fix muddy gradients. Free on t
Developer Productivity Tools: The 40 I Actually Open Every Week
The developer productivity tools I reach for daily — formatters, converters, generators, regex, images, colors. All client-side, no signup, no upload. On toolz.
UUID v4 vs v7: Which Version Should You Use?
Generate UUIDs (v1, v4, v7) and learn which version to use, how to store them without wrecking your index, and the VARCHAR mistake I made. On toolz.dev.
Regex Cheat Sheet: Common Patterns and Pitfalls
Build and test regex visually, with a cheat sheet, battle-tested patterns, and the backtracking trap that froze my server. Browser-based, private, on toolz.dev.
The Developer Utilities I Actually Use
The free online coding tools I reach for daily — JSON, Base64, regex, UUID, hashing, timestamps — all browser-based and private. Built by a developer, on toolz.