License Key Generator - Online Serial & Product Code Maker
Generate random license keys or serial numbers in various formats (XXXX-XXXX-XXXX). Useful for software activation testing. Local generation.
UD5 Toolkit
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Generate random license keys or serial numbers in various formats (XXXX-XXXX-XXXX). Useful for software activation testing. Local generation.
Run multiple named timers simultaneously for cooking. Presets like pasta, rice, etc. Audio alarm. Works in background.
Generate the next sequential invoice number with optional prefix and date stamp. Keep track locally or export.
Generate cryptographic key pairs using the Web Crypto API. Export as JWK or raw. No server needed; pure security.
Number each line of your text sequentially. Customize start number and format. Useful for code snippets, tutorials, and document review. Private operation.
Design a custom counter style with symbols, range, and speak‑as. Preview ordered lists with your new style. Export the CSS rule.
Record audio from your microphone and export as a WAV file. Monitor levels. Processed entirely in your browser.
Record audio from your microphone and export as a WAV file. Monitor levels. Processed entirely in your browser.
Upload a photo to create a numbered painting canvas with color swatches. Print and paint. Local only.
Design custom unordered and ordered lists with images, strings, or counters. Preview and copy the CSS.
Upload multiple SVGs and combine them into a single SVG sprite sheet with `<symbol>` and `<use>`. Fast icon system.
Convert JSON data structures to clean, human-readable YAML. Indentation and formatting preserved. All processing done locally for your privacy.
Connect to a serial device (Arduino, etc.) via the Web Serial API. Send and receive text. No native app needed.
Fill in container image and ports. Generate a Deployment and Service YAML with best practices. Start your K8s journey.
Generate custom placeholder images for mockups and layouts. Specify dimensions, colors, and text. Export as PNG or use the generated data URI. Entirely browser-based.
Get a clean, commented JS plugin skeleton with IIFE or ES module pattern. Start your new library faster.
Write HTML, CSS, and JavaScript in separate panes and see the result in real time. Store your snippets locally.
Generate classic retro sound effects (coin, jump, explosion) using oscillators and noise. Play and download as WAV. Web Audio API fun.
Combine random character, setting, conflict, and genre to generate unique story prompts. Over 10,000 possible combinations. Perfect for overcoming writer's block.
Paste a phone number and format it according to the E.164 standard. Identify country and detect common typos. Local parser.
Build an accessible modal using the native <dialog> element. Customize backdrop, content, and open/close logic. Copy the code.
Convert any human‑readable date to a Unix timestamp in seconds or milliseconds. Also shows ISO 8601. Clean interface.
Dual-function tool: a precise stopwatch with laps and a configurable countdown timer with alarm sound. Works offline, perfect for activities.
Create .srt subtitle files manually by adding lines and setting times with a simple player. Download the result. Local.
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds. Ideal for developers debugging time-related code.
Generate a grey placeholder image with custom text and dimensions. Data URI output. No external service.
Generate a subtle or heavy noise/grain texture as a CSS background. Adjust intensity and color. Copy the small code.
Convert between square meters, square feet, acres, hectares, and more. Essential for real estate and land measurements. Instant results, private data.
Test the upcoming <selectlist> element for a fully customizable, stylable select dropdown. Experimental browser feature.
View the individual red, green, and blue channels of an image as grayscale. Photographer and developer tool.