Products, experiments, and useful tools.

Decode X.509 certificates and CSRs in the browser — subject, SAN, validity, and key usage details.

Clean, printable developer cheatsheets — Shell & CLI, editors, DevOps, languages, and macOS. 19 sheets with PDF downloads, privacy-first with no trackers.

Explore JSON, YAML, CSV, TSV, and XML as collapsible trees or tables.

View Word documents with formatting, tables, and images preserved.

Read email files with headers, body, attachments, and SPF/DKIM/DMARC authentication checks.

Render EPUB books with chapter navigation and table of contents.

Hub for the File Viewer series — single-file, offline-capable browser viewers that process files locally. No uploads, no accounts, MIT licensed.

Render HTML in a sandboxed frame, or view CSS/SCSS/JS/TS source with syntax highlighting.

View PNG, JPEG, WebP, SVG, TIFF, TGA, QOI, PCX, PPM, farbfeld, and DDS images.

What is my IP? Privacy-first IP, DNS & email diagnostics and free network tools.

Read log and text files with search, level filtering, and virtual scrolling.

Fast, mobile-first, single-file Markdown viewer. Drag & drop any text file to render it — no build, no uploads.

Read PDFs in the browser, powered by pdf.js.

View PowerPoint presentations slide by slide — text, layout, and images.

Read Microsoft Publisher files with metadata and text extraction.

Open spreadsheets (.xlsx, .xls, .ods) as tables with sheet tabs.

Fast text utilities for formatting, cleanup, and quick content transformations in your browser.

Simple, direct file uploads with a clean workflow for sharing content quickly.

Recreation archive of web-server default pages — Microsoft IIS (1995–2022) and the major Linux servers (nginx, Apache, Caddy).

Cloudflare Worker that routes inbound emails to a Discord channel via webhook — turn a custom-domain inbox into a Discord notification stream.

Minimal client-side tone generator — produce precise frequencies in the browser. Single-page tool, zero dependencies.

Browse any public GitHub repo's file tree without cloning. Single-page web tool — paste a URL, get the tree.

Auto-rename movies, fix grammar, check IMDb, handle duplicates. Your collection, perfected.

Michal's InGame Mods for Farming Simulator 25 — a single-file Lua script mod that removes speed caps, maxes trailer capacity, and equalizes tractor power, with transparent logging.

Personal Pi-hole customizations and curated blocklists for ad-free, ad-block-aware home DNS filtering.

A curated collection of homelab, backup, sync, media, and system automation scripts — Bash, Python, PowerShell, organized by topic. Every file-modifying script supports --dry-run.

Production-ready redundant Unbound DNS infrastructure for home labs. Pi-based primary/secondary resolvers with DNSSEC, automated config sync, health monitoring, and TSV-based host management.

Beautiful terminal welcome message with fastfetch, weather, system metrics & multi-language support. Configurable, cached, supports 5+ distros. Bash & ZSH compatible.