Useful Tools. A Simpler Internet.

🛠 Twitch Bits & Subs to USD Calculator Free Twitch streamer earnings calculator — converts Bits, Tier 1/2/3 subscriptions, Prime subs, ad revenue (RPM × hours × viewers), and external donations into USD. Shows your take-home vs Twitch's platform cut, effective hourly rate, per-sub average, year projection, and revenue source breakdown. 1 🛠 Shopify Profit Calculator Free Shopify profit calculator — net per order after credit card processing, transaction fees, shipping cost, returns allocation, and app subscriptions. Sales tax shown as separate pass-through line (money you collect and remit, not your revenue). 100% client-side, no upload. Includes three tabs: pe 🛠 Amazon FBA Cost Calculator Free Amazon FBA cost calculator — full landed cost per unit including referral fee (by category), FBA fulfillment fee, monthly storage (off-peak and peak blended), long-term storage, returns allocation, inbound placement, and advertising. Three tabs: per-unit profit/margin/ROI breakdown with verdict 🛠 Etsy Fee Calculator Free Etsy fee calculator — instant breakdown of listing, transaction (6.5%), payment processing (3% + $0.25), and offsite ads (15% or 12%) fees. 100% client-side, no upload. Includes a reverse calculator to find the price you need for your target profit margin, plus a scenario comparison (with/witho 🛠 AI Text Humanizer Free online tool that rewrites AI-flavored or formulaic text to sound more natural in your browser. 100% client-side — no upload, no account. Replaces 100+ overused AI words (delve, leverage, robust, comprehensive, moreover, furthermore, etc.), varies sentence rhythm, varies sentence openers, option 🛠 HEIC to JPG Converter Free online tool to convert Apple HEIC / HEIF photos to JPG in your browser. 100% client-side, no upload, no account. Supports batch conversion, JPG quality control, optional resize to 4K/2K/Full HD/HD, and bulk download as a ZIP. Built with heic2any (WebAssembly) for cross-browser HEIC decoding. Pr 🛠 Blog Title Generator Free online tool to brainstorm SEO-friendly blog post titles. Enter a topic and get 12 unique title variants. 146 hand-crafted templates across 8 tones (how-to, listicle, question, comparison, guide, mistakes, trends, opinion). Optional second topic, audience, and constraint fields. Copy individual 🛠 Percent Weight Gain Calculator Turn any two body weights into an accurate percent weight gain or loss figure, plus an optional weekly rate. EN 🛠 Grade Calculator For Teachers Free A free, single-page weighted grade calculator that turns assignment scores into a course percentage and letter grade in seconds — no login, no spreadsheet. EN 🛠 Remove Duplicate Lines Online Paste a list and instantly remove duplicate lines, with optional case-insensitive matching, whitespace trimming, empty-line removal, sorting, duplicate counts, copy and .txt download — all in your browser. EN 🛠 Webpage To Markdown Converter Paste any article or docs URL and get clean, copy-ready GitHub-flavoured Markdown of its text — built for developers, researchers and note-takers who need page content as Markdown for a README, wiki or LLM prompt. Not affiliated with any branded converter; this is a generic HTML→Markdown utility. EN 🛠 Best Online Xml Formatter A fast, private, in-browser XML formatter and validator that beautifies, minifies and error-checks any pasted or dropped XML — no upload, no ads, no account, for developers who just want clean markup in one page. EN 🛠 Xml Sitemap Generator From Url List A no-install browser tool that turns a pasted list of URLs into a valid, downloadable sitemap.xml for SEO submission — serving webmasters, SEO freelancers and developers who already have their URL list and just need the file. Assumes the user supplies URLs (no crawling, no site fetch). EN 🛠 Product Photo Background Remover 纯浏览器内运行的商品图去背景工具：拖入一张商品照片，直接在本地算出软边 alpha 蒙版并导出原分辨率的透明 PNG，图片全程不上传服务器、无登录、无等待排队。 EN 🛠 PDF Accessibility Checker Upload a PDF (≤15 MB) and get a pass/fail verdict plus a fixable issue list for PDF/UA, Section 508 and WCAG 2.1 AA self-checks. EN 🛠 ICS Calendar Generator Type a meeting title, start time and timezone, then download a valid .ics file that imports into Google Calendar, Apple Calendar or Outlook. Runs entirely in your browser — no account, no email, no server round-trip. EN 🛠 Green Screen Remover Remove a green screen in your browser: drop in a chroma key clip or photo, sample the key colour, dial tolerance, and download a transparent PNG or an alpha PNG frame sequence. No upload, no signup, no watermark. EN 🛠 8-Bit SFX Generator Free online 8-bit sound generator and jsfxr-style retro SFX maker: choose a coin, jump, laser, explosion or power-up preset, tweak the waveform and length, preview instantly in the browser and download a real 16-bit 44.1 kHz mono .wav. No sign-up, no plugins, nothing uploaded. EN 🛠 Online Gantt Chart Maker A zero-signup, zero-backend Gantt chart builder: paste your task list and dates, instantly see a clean project timeline, and export it as PNG, CSV or ICS. The free, no-Excel, no-account alternative for simple project timelines. EN 🛠 Tournament Bracket Maker A free, no-signup, single-screen generator that turns a pasted team list into a clean printable or shareable elimination bracket — the anti-bloat alternative to account-walled bracket sites. EN 🛠 Custom PRD build A zero-upload JWT inspector that decodes any JSON Web Token's header and payload entirely in the browser and flags whether it is still valid — built for developers debugging auth in the next 30 seconds. EN 🛠 Custom PRD build Convert one image between JPEG/PNG/WebP and JPEG XL entirely in the browser, compare the exact byte size difference and download the result — nothing is uploaded. EN 🛠 Life Counter For Mtg A tap-first, offline-capable life counter for Magic: The Gathering players sitting across a table — a generic tabletop life-and-counter tracker, not affiliated with or cloning any branded app. EN 🛠 Live Currency Converter EN 🛠 Cron Expression Generator A single-screen cron builder for developers: click the minute/hour/day/month/weekday chips (or paste an existing expression) and get a valid cron string in standard, Quartz and AWS EventBridge dialects, a plain-English description, and the next 5 fire times in your timezone. Zero login, instant, runs entirely in the browser. EN 🛠 Calcul Date En Ligne Calcul date en ligne : écart exact entre deux dates, ajout ou soustraction de jours, semaines, mois et années, jours ouvrés (week-ends et fériés français exclus) et calcul d'âge — résultat instantané dans le navigateur. EN 🛠 Tile Calculator For Floor A no-nonsense floor tile calculator that turns room dimensions plus tile size and grout width into an exact tile and box count — for US homeowners and DIY remodelers standing in a tile aisle with a phone. EN 🛠 LLM Token Counter A no-signup, no-API-key online token counter that estimates how many tokens a prompt will consume for popular LLMs (GPT-4o, GPT-4.1, Claude, Gemini) and what that prompt will cost, entirely in the browser. Aimed at the search intent behind 'openai token counter', 'tiktoken online' and 'prompt token estimator' for developers, prompt engineers and coding-agent users who want a fast sanity check before spending money or blowing a context window. EN 🛠 Générateur De Fiche De Cours Transforme un sujet et un niveau en fiche de révision française structurée (définitions, points clés, pièges, questions de révision), prête à copier, télécharger en markdown ou imprimer en PDF A4. EN 🛠 Reverse Gst Calculator Australia Free one-screen reverse GST calculator for Australia: strip the 10% GST out of a tax-invoice total (or add it back) and read the ex-GST subtotal, GST component and gross amount instantly, with the exact formula shown. EN 🛠 Online Business Valuation Tool A browser-based estimator that turns a small online business's revenue, profit, growth, and owner dependence into a defensible valuation range (low/mid/high) with the implied multiples a buyer would actually pay. Built for solo founders and first-time flippers who need a ballpark before talking to a broker or listing on a marketplace. EN 🛠 Word Frequency Counter Count word frequency in any text instantly — a ranked top-20 list with counts and share of total, plus one-click CSV export. Free, private, runs fully in your browser. EN 🛠 World Time Meeting Planner A one-screen world clock that shows exactly which hours two cities can both meet on a chosen date, rendered as a 24-hour overlap timeline instead of a bare time-zone conversion. EN 🛠 Word Frequency Counter A no-signup, instant word frequency analyzer: paste any text and get the top 20 most repeated words with counts, percentages, and a one-click CSV export. Everything runs locally in the browser, so no text ever leaves the page. EN 🛠 IP Address Lookup EN 🛠 Free Meta Description Generator Free SEO meta description generator: turn a page title and keyword into click-worthy descriptions with character counts and one-click copy. EN 🛠 Custom PRD build Merge 2-20 PDFs into one file or split a PDF into page ranges. Real pypdf processing, no sign-up, no watermark, files deleted after the run. EN 🛠 Favicon And App Icon Generator A zero-install, single-screen generator that turns one uploaded image into a complete, correctly-named favicon and app-icon package (browser tab, iOS home screen, Android adaptive, Windows tile) plus a copy-paste HTML snippet — all rendered instantly in the browser, with live preview and rounded-corner / background handling. EN 🛠 Photo to Maze Generator Turn any photo into a printable maze shaped like the picture — 300 DPI PNG or Letter/A4 PDF, entirely in your browser. EN 🛠 Image to ASCII Art A one-screen, zero-install converter that turns any dropped image into copy-paste-ready ASCII art — plain monochrome for code comments, or truecolor/ANSI for README badge blocks and Discord messages — with width control so the output fits the target medium. EN