Useful browser tools without the runaround

Convert audio files locally in your browser. MP3, WAV, OGG, FLAC and more — no upload, private WASM processing.

Create and share 16-step beat box drum patterns with synthesized kick, snare, hi-hat, and clap sounds in the browser.

A fullscreen classroom and projector countdown timer with presets, shareable settings, sound alerts, and large high-contrast display modes.

Convert CSV to JSON or JSON to CSV with custom delimiters, header controls, validation, and readable output formatting.

Calculate days, weeks, and calendar months between two dates online. Optional IANA timezone, strict validation, and copy-friendly results.

Generate a whimsical egg character card with a seeded name, shell traits, face, accessory, mood, and copy-ready personality blurb.

Pick or paste a hex color, convert to RGB, HSL, and HSV, generate harmony swatches and tint/shade strips, copy values, and export CSS or JSON. Runs in your browser on qwertywelch.com.

Detect visually confusable Unicode characters and convert them to safer ASCII or normalized Unicode. Free homoglyph converter and confusables checker that runs locally in your browser.

Use this paint coverage calculator to estimate gallons or liters for a room or wall project. Enter room dimensions or total area, subtract doors and windows, choose coats and waste, and get an instant paint quantity estimate.

Convert images between formats instantly in your browser. Powered by Rust/WASM. Supports JPEG, PNG, WebP, GIF, BMP, TIFF, ICO, QOI, TGA, AVIF, SVG, and HEIC.

Parse, explore, and extract assets from iOS and macOS compiled Asset Catalog (.car) files

Format, minify, and validate JSON instantly with customizable indentation, clear syntax errors, and one-click copy controls.

Convert Markdown to editable rich text in your browser, paste from Word or Google Docs, normalize formatting, then print or export to PDF—all locally on qwertywelch.com.

Play and visualize local MIDI files in your browser with a synchronized piano roll, transport controls, and copyable metadata.

Interactive mortgage calculator for monthly PITI, total interest, total paid, optional yearly amortization, and shareable URL scenarios.

Fetch Open Graph and Twitter Card metadata from a public URL, preview Facebook, X/Twitter, and LinkedIn-style cards, override fields locally, and export HTML meta tags or JSON.

Explore cubes, spheres, cylinders, and more in an interactive 3D viewer with exact volume and surface area calculations.

Create customizable QR codes for URLs, text, email, phone, Wi-Fi, and contact cards, then download PNG or SVG output.

Single-page unit converter for common quantities (length, weight, volume, temperature) with a minimal, fast UI.

Generate strong random passwords with customizable length and character sets. Free secure password generator that runs entirely in your browser.

Create and automatically sync private text notes across devices with account-based storage.

Private layered stencil preflight with island detection, automatic bridges, SVG, DXF and tiled PDF exports.

Convert text case online instantly: uppercase, lowercase, title case, sentence case, camelCase, snake_case, kebab-case, and more. Free, private, runs in your browser.

Count characters, words, sentences, and paragraphs in real time, with reading-time, speaking-time, and word-frequency insights.

A lightweight in-browser text diff checker that compares two text inputs and highlights additions, deletions, and changes with inline diff visualization.

Reverse text, reverse word order, sort lines, shuffle lines, remove duplicate lines, and renumber lines online. Fast in-browser text reverser and line sorter.

Convert input text into spoken audio using the browser's speech synthesis API. No server required - all processing happens locally in your browser.

Convert between Unix timestamps and human-readable dates. Supports timezone conversion and bidirectional conversion.

Encode or decode full URLs and URL components with instant output, validation feedback, examples, and copy controls.

Parse any browser user agent string into browser, OS, device, engine, and bot details. Deterministic local parsing with JSON output, token breakdown, and shareable links — no API required.

Generate UUIDs/GUIDs online. Supports UUID v1, v4, and v5. Free, fast, and secure UUID generator.

Enter foreground and background colors in hex or RGB to instantly calculate the WCAG contrast ratio, view AA/AAA pass-fail results, preview text on your colors, and get optional tweak suggestions.

Instantly see your public IP address with IP version, approximate location, timezone, ISP, and ASN. Look up another IPv4 or IPv6 address with shareable URLs.

Open and explore ZIP files in your browser without uploading them. Browse folders, search files, preview text content, and download individual entries locally.