Tools

← nicolaeandrei.com

Single HTML file browser tools, built with Claude Code and Codex during gym breaks and tram waits. Things may break — these are low-stakes experiments, not production software.

Tip: On iOS, tap Share → Add to Home Screen for an app-like experience.

Image & media

Document Scanner Scan documents with your phone camera. Drag corners to crop, apply filters, and download as PDF or image. Image ↔ SVG Converter Convert between raster images (PNG, JPG, WebP) and SVG. Runs entirely in the browser. Image ↔ PDF Converter Convert images to PDF or extract PDF pages as images. Supports JPG, PNG, WebP, GIF, BMP, TIFF. Background Remover Remove image backgrounds locally using AI. Runs entirely in your browser via WebAssembly. Video to GIF Converter Convert any video to an animated GIF in your browser. Trim, set FPS and width, preview, and download. Asset Resizer Resize images for app stores, browser extensions, YouTube, Steam, and more. Download individually or as ZIP. Image Compressor Resize, adjust quality, and convert between PNG, JPEG, and WebP. Runs entirely in the browser. OCR Extract text from images using Tesseract.js. Supports 20+ languages, runs entirely in your browser. EXIF Stripper Remove EXIF metadata from photos before sharing. View embedded GPS, camera, and date info, then strip it all. Face Shield Hide faces in photos with paper bag, cat face, stormtrooper, emoji, mosaic, or blur overlays. Auto-detects faces, runs in your browser. Image Diff Compare two images with slider overlay, side-by-side view, or pixel diff highlighting. Color Palette Extractor Extract dominant colors from images. Magnifying loupe eyedropper, export as CSS, Tailwind, or PNG. HEIC → JPEG Converter Convert iPhone HEIC photos to JPEG. Runs entirely in the browser using libheif WASM.

Text & document

Sheet Converter Convert between XLSX, CSV, and ODS spreadsheet formats. Preview sheets before converting. DOCX → PDF Converter Convert DOCX files to PDF in the browser. Markdown → PDF Write or drop a .md file, preview with syntax highlighting, and export to PDF. Live editor with split preview. PDF Merger / Splitter Merge multiple PDFs into one or split a PDF by selecting pages. Drag to reorder, visual page picker. PDF Compressor Reduce PDF file size by re-rendering pages as compressed images. Runs entirely in the browser. Word Counter & Reading Time Count words, characters, sentences, and paragraphs. Reading time, speaking time, and readability score. Paste Formatter Paste markdown or terminal output, get clean text for Slack, LinkedIn, or anywhere. Speech to Text Transcribe speech to text in real time. Multiple languages, live results, timestamps, and confidence scores.

Data & health

Apple Health Explorer Analyze your Apple Health export with interactive charts. Track weight, steps, workouts, heart rate, and correlations. Fuel Log Plain text calorie and macro tracker. Type what you ate, get instant nutrition estimates with USDA lookup. Gym Tracker Log sets, reps, and weight. Track progress with charts, personal records, and deload week tagging. Baby Diaper Tracker Track pee and poo counts per day. Supports multiple babies, timestamped logs, and weekly summaries. Plate Calculator Enter your target barbell weight, see which plates to load on each side. Visual barbell diagram with kg/lb toggle. Deload Calculator Calculate deload week sets, reps, and volume reduction. Enter your working prescription, get a deload recommendation.

Sumo

Sumo Day Companion Daily sumo tournament companion. Follow live basho with bout cards, win/loss tracking, and spoiler-free match reveals. Sumo Stats Look up any wrestler's career stats, basho results, and rank progression. Compare two rikishi side by side. Grand Sumo Calendar Downloadable ICS calendar for every honbasho. All six basho with dates, venues, and cities.

Travel & social

Wanderlog Travel guide aggregator. Auto-generated walking tours, curated research links for coffee, beer, and hidden gems. Fedi Media Extractor Extract all images and videos from any Bluesky or Mastodon profile. Browse in a gallery, copy URLs.

Food & drink

Coffee Brewing Guide James Hoffmann's recipes for AeroPress, French Press, V60, and Espresso with interactive timers. Coffee Bean Tasting Log Rate beans by roast, origin, acidity, body, and flavor notes. Track roasters and export tasting history. Grind Size Guide Visual grind size reference by brew method. Settings for Niche Zero, Comandante, 1Zpresso, and Baratza Encore.

Trams

Tram Spotter Log Log tram sightings by model, city, line, and fleet number. Browse history, view stats, and export data.

Cycling

Tire Pressure Calculator Recommended tire pressure based on weight, tire width, and surface. Front/rear split with PSI and bar.

Utility

Unit Converter Convert length, weight, temperature, and currency. Live ECB rates, cached for offline use. Compound Interest Calculator Calculate compound interest with monthly contributions, inflation adjustment, and year-by-year breakdown. Invoice Generator Generate invoices with auto-filled dates, saved company profiles, and PDF export.

Developer

Cron Expression Builder Visual cron schedule builder with human-readable output and next run preview. JWT Decoder Decode and inspect JSON Web Tokens. View header, payload, registered claims, and expiry status. AI Agent Session Converter Convert coding agent sessions between Claude Code, Codex CLI, Cursor, Pi, and OpenCode. JSONPath Tester Test JSONPath expressions against JSON data. Paste JSON, write queries, see matches in real time. Regex Tester Test regular expressions with live matching, pattern explanation, and cheat sheet. SQL Formatter Prettify and minify SQL queries. Supports PostgreSQL, MySQL, SQLite, T-SQL, PL/SQL, and more. Base64 / URL Encoder-Decoder Encode and decode Base64 or URL strings. Supports file upload, URL-safe Base64, and padding options. HTML Entity Encoder Encode and decode HTML entities with live preview, named/numeric modes, and reference table. Hash Generator Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files using Web Crypto API. Color Converter Convert between HEX, RGB, HSL, and OKLCH. Visual picker, contrast checker, and color harmonies. DNS Lookup Check if a domain is taken and view all DNS records (A, AAAA, MX, TXT, NS, CNAME, SOA, CAA). Chmod Calculator Toggle read/write/execute checkboxes, see numeric and symbolic chmod representation. Unix Timestamp Converter Convert between Unix timestamps and dates. Live clock, relative time, click to copy. PG Explain Visualizer Visualize PostgreSQL EXPLAIN plans. Color-coded tree with timing, row estimates, and warnings. Data Format Converter Convert between JSON, YAML, and TOML. Prettify, minify, and auto-detect format. SSH Config Generator Generate SSH config blocks visually. Fill in fields, preview the output, copy or import existing configs. CSS Flexbox / Grid Playground Visual layout builder. Toggle Flexbox and Grid, tweak properties, preview live, and copy the CSS. UUID / ULID Generator Generate UUID v4, UUID v7, ULID, and Nano ID. Bulk generate, click to copy, view format details.

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