Free · No sign-up · Runs locally
Tool09.com
Free online utilities for everyday tasks.
Calculators
3-
BMI Calculator
Calculate your Body Mass Index. Metric and imperial units; six classification standards — WHO, China, Japan (JASSO), Asia-Pacific (WPRO), US (CDC/NIH), and UK (NHS).
-
Calculator
A fast online calculator for everyday math. Chain operations with order of precedence, see a live result preview as you type, use your keyboard, and copy the answer in one tap.
-
Scientific Calculator
A full scientific calculator in your browser — trig, logarithms, powers and roots, factorials, constants, memory, and degree/radian modes, with a live result preview and one-tap copy.
Screen Tools
9-
LED Marquee
Display giant scrolling or static text fullscreen — for airport pickups, concerts, KTV, classroom signs, or shouting across a noisy room. Works on phone and desktop.
-
Fill Light
Turn your phone or laptop screen into a fill light. Eight color presets plus full color picker, brightness slider, fullscreen mode with screen wake lock — works on phone and desktop.
-
Wheel of Fortune
A colorful spin-the-wheel for raffles, decision-making, lunch-pickers, and classroom games. Up to 50 options, optional remove-after-win, history log.
-
Random Name Picker
Pick one or more random names from a list, with a slot-machine flicker animation. Optional fullscreen mode, no-repeat per round, and remove-after-pick for classrooms.
-
Concert Glow Stick
Use your phone screen as a concert glow stick. Rainbow flow, two-color alternate, breathing pulse, or solid color. Adjustable speed and brightness.
-
Concert Sign Board
Multi-line giant text sign for concerts and fan events. Neon glow, alternating colors, italic, ♥ decorations, optional flashing. Auto-fits any number of lines.
-
Piano
Play piano right in your browser using your computer keyboard, mouse, or touch screen. A built-in synthesizer means no downloads or samples — shift octaves, hold the sustain pedal, and show key or note labels. Works fully offline.
-
Minimal Clock
A zen full-screen clock with several styles — minimal, flip, thin, LED, LCD, and ring. Pick a look and tap to fill the screen; great as a desk or nightstand display.
-
Metronome
A precise online metronome for practising any instrument. Set the tempo from 30 to 300 BPM, choose the beats per measure, accent the downbeat, and tap along to find the tempo of a song. Runs entirely in your browser, even offline.
Image
1Text
7-
Word Counter
Count words, characters, sentences, and paragraphs. See reading time, speaking time, character-limit indicators for tweets and SEO, and keyword density — instantly in your browser.
-
English Case Converter
Convert text between UPPERCASE, lowercase, Title Case, and Sentence case instantly in your browser.
-
Text Diff
Compare two pieces of text side by side. Highlights additions, deletions, and unchanged content at line, word, or character granularity.
-
Lorem Ipsum Generator
Generate placeholder Lorem Ipsum text by paragraphs, sentences, or words. Optionally start with the classic opening or wrap output in <p> tags.
-
Simplified ↔ Traditional Chinese
Convert between Simplified and Traditional Chinese with phrase-aware accuracy. Choose Mainland, Taiwan, Hong Kong, or Japanese Shinjitai variants. Powered by OpenCC.
-
Markdown Editor
Open a local Markdown file, edit it online, preview it live, and save it back or download a copy.
-
Translator
Translate text between 20+ languages right in your browser using Chrome's built-in on-device AI. Auto-detects the source language, works offline after a one-time model download, and never uploads your text.
Encoding & Format
5-
JSON Formatter & Validator
Format, validate, and minify JSON. See parse errors with line and column numbers, sort keys alphabetically, and choose the indent size — all offline in your browser.
-
URL Encoder / Decoder
Percent-encode or decode URL strings. Switch between component-safe encoding (encodeURIComponent) and full-URL encoding (encodeURI), with live conversion as you type.
-
Base64 Encoder / Decoder
Encode text or any file to Base64 and decode back. UTF-8 safe, with URL-safe (base64url) and Data URL options for embedding in HTML or CSS.
-
Markdown ↔ HTML Converter
Convert Markdown to HTML and back. GitHub-flavored, with live preview rendered in a sandboxed iframe.
-
Chinese Capital Amount
Convert numbers to Chinese fiscal capital form (壹仟贰佰叁拾肆元伍角陆分整). Used on receipts, invoices, and contracts. Handles negatives, decimals, and inter-section zeros.
Developer Utilities
8-
SHA Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes of any text or file. Computed locally with the browser's Web Crypto API.
-
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Live current time in seconds and milliseconds, local and UTC at a glance, with ISO 8601 and relative time output.
-
UUID Generator
Generate cryptographically random UUID v4 or time-ordered UUID v7 (RFC 9562). Bulk output, multiple formats — no hyphens, uppercase, braces, URN — and one-click copy.
-
Password Generator
Generate strong random passwords with configurable length, character classes, and exclusion rules. Live entropy and strength meter. All randomness comes from the browser's secure RNG.
-
HMAC Generator
Compute HMAC-SHA-1, SHA-256, SHA-384, or SHA-512 of any message with a secret key. Live computation as you type. Uses the browser's Web Crypto API.
-
QR Code Generator
Create a QR code from any text, link, Wi-Fi, or contact details right in your browser. Pick the error-correction level and colours, preview it live, then download a crisp PNG or copy it to the clipboard. Everything is generated locally — nothing is uploaded.
-
Search Hub
A list of search engines and site searches, each with its own search box. Type in any row and jump straight to results on Google, Bing, Baidu, Yandex, Naver, YouTube, GitHub, Wikipedia and more. Build your own shortlist — add, remove, and drag to reorder. Saved in your browser.
-
World Clock
Track the current time across multiple cities and time zones at a glance — add any city, switch between 12- and 24-hour formats, and see day/night and date offsets. Your selection is remembered on this device.