Online Tools
Free online utilities for everyday tasks.
Calculators 1
Screen Tools 6
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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.
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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.
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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.
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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.
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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.
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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.
Image 1
Text 6
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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.
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English Case Converter
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case, CONSTANT_CASE and more — instantly, in your browser.
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Text Diff
Compare two pieces of text side by side. Highlights additions, deletions, and unchanged content at line, word, or character granularity.
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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.
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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.
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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
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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.
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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.
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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.
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Markdown ↔ HTML Converter
Convert Markdown to HTML and back. GitHub-flavored, with live preview rendered in a sandboxed iframe.
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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 5
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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.
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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.
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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.
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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.
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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.