HTML Live Previewer - Online Code to Rendered View
Write or paste HTML, CSS, and JavaScript and instantly see the rendered output in a sandboxed iframe. A handy frontend prototyping tool.
UD5 Toolkit
Drag & drop a video file here
or
MP4, WebM, Ogg supported
Write or paste HTML, CSS, and JavaScript and instantly see the rendered output in a sandboxed iframe. A handy frontend prototyping tool.
Write HTML, CSS, and JavaScript in separate panes and see the result in real time. Store your snippets locally.
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.
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 classic retro sound effects (coin, jump, explosion) using oscillators and noise. Play and download as WAV. Web Audio API fun.
Enter a MIDI note number (0–127) or a musical note name and get the exact frequency in Hz. Piano keyboard picker.
Upload multiple SVGs and combine them into a single SVG sprite sheet with `<symbol>` and `<use>`. Fast icon system.
Sing or play an instrument into the mic and see the detected pitch on a real‑time chromatic tuner. Use for practice or ear training.
Paste a list of URLs or texts and generate QR codes all at once. Download as individual images or a single sheet.
Upload a logo to embed in the center of a QR code. High error correction so it still scans. Download PNG/SVG.
Convert JSON data structures to clean, human-readable YAML. Indentation and formatting preserved. All processing done locally for your privacy.
Generate cryptographic key pairs using the Web Crypto API. Export as JWK or raw. No server needed; pure security.
Paste lyrics and tap while the song plays to embed timestamps. Export as .lrc file for music players. All in browser.
Convert a JSON array of strings or numbers into a single‑column CSV. Quick data dump. Local.
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds. Ideal for developers debugging time-related code.
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.
Convert any human‑readable date to a Unix timestamp in seconds or milliseconds. Also shows ISO 8601. Clean interface.
Build Apache mod_rewrite rules for redirects or clean URLs. Fill in simple fields and get the .htaccess code.
An animated hourglass that you can set for any time. Watch the sand flow. Beautiful and calming timer.
Generate encrypted passwords for .htaccess basic authentication. Create .htpasswd entries using bcrypt, MD5, or SHA. Server admin utility, local compute.
Get a clean, commented JS plugin skeleton with IIFE or ES module pattern. Start your new library faster.
Connect to a serial device (Arduino, etc.) via the Web Serial API. Send and receive text. No native app needed.
Build an accessible modal using the native <dialog> element. Customize backdrop, content, and open/close logic. Copy the code.
Generate random, secure coupon codes with a prefix. Choose length and character set. Perfect for store admins. All local.
Write SSML to control pitch, speed, and breaks. Play the generated speech with the browser’s TTS engine. Learn SSML.
Compare visibility: hidden vs display: none. See how each affects layout and event listeners. Inline code.
Place rectangular pattern pieces on a virtual fabric width to optimize cutting layout and reduce waste. Simple manual drag & drop. Local only.