Stopwatch & Countdown Timer - Online Dual Tool
Dual-function tool: a precise stopwatch with laps and a configurable countdown timer with alarm sound. Works offline, perfect for activities.
UD5 Toolkit
Online Visual Timer with Flowing Sand Animation
Dual-function tool: a precise stopwatch with laps and a configurable countdown timer with alarm sound. Works offline, perfect for activities.
Run multiple named timers simultaneously for cooking. Presets like pasta, rice, etc. Audio alarm. Works in background.
Upload a photo to create a numbered painting canvas with color swatches. Print and paint. Local only.
Flip images vertically or horizontally, and rotate in 90° increments. Quick and simple editing right in the browser. Download the corrected image instantly.
Design a custom counter style with symbols, range, and speak‑as. Preview ordered lists with your new style. Export the CSS rule.
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.
Convert any human‑readable date to a Unix timestamp in seconds or milliseconds. Also shows ISO 8601. Clean interface.
Compare visibility: hidden vs display: none. See how each affects layout and event listeners. Inline code.
Generate a grey placeholder image with custom text and dimensions. Data URI output. No external service.
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds. Ideal for developers debugging time-related code.
Create .srt subtitle files manually by adding lines and setting times with a simple player. Download the result. Local.
Generate classic retro sound effects (coin, jump, explosion) using oscillators and noise. Play and download as WAV. Web Audio API fun.
Move the vanishing point of a 3D scene. Drag to set perspective‑origin and see the scene shift. Copy CSS.
Design custom unordered and ordered lists with images, strings, or counters. Preview and copy the CSS.
Paste start and end SVG paths with the same number of points and preview a smooth morph animation. Copy SMIL code.
Generate the next sequential invoice number with optional prefix and date stamp. Keep track locally or export.
Convert an SVG shape into a CSS mask‑image. Transparent regions become masked. Great for custom image crops. Client‑side.
Convert between square meters, square feet, acres, hectares, and more. Essential for real estate and land measurements. Instant results, private data.
Generate a subtle or heavy noise/grain texture as a CSS background. Adjust intensity and color. Copy the small code.
Upload multiple SVGs and combine them into a single SVG sprite sheet with `<symbol>` and `<use>`. Fast icon system.
Generate random license keys or serial numbers in various formats (XXXX-XXXX-XXXX). Useful for software activation testing. Local generation.
Number each line of your text sequentially. Customize start number and format. Useful for code snippets, tutorials, and document review. Private operation.
View the individual red, green, and blue channels of an image as grayscale. Photographer and developer tool.
Adjust opacity visually with a slider and see the different CSS representations (opacity property vs RGBA/HSLA). Copy best option.
Connect to a serial device (Arduino, etc.) via the Web Serial API. Send and receive text. No native app needed.
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.
Build an accessible modal using the native <dialog> element. Customize backdrop, content, and open/close logic. Copy the code.
Write HTML, CSS, and JavaScript in separate panes and see the result in real time. Store your snippets locally.
Paste a list of URLs or texts and generate QR codes all at once. Download as individual images or a single sheet.