Embed Tester
Test and preview embed codes before adding them to your website.
Embed Tester
See how it works
Watch a quick simulation of this tool in action — no file needed.
How to use Embed Tester
Follow these steps — everything happens instantly in your browser.
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Step 1. Paste your embed code (HTML, iframe, or widget) into the editor.
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Step 2. Click 'Run' to render the code in the preview panel.
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Step 3. Verify the embed works correctly before copying to your website.
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Step 4. The preview renders the code exactly as it would appear on your site.
Why use this tool
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about embed tester.
Code Playground
Write, edit, and preview HTML/CSS/JS code live in your browser.
CSS Minifier & Beautifier
Compress or re-indent CSS — instantly, locally.
HTML to Markdown Converter
Convert HTML to clean Markdown via DOMParser — no regex hacks.
Markdown Preview
Write Markdown and see the rendered HTML live — side by side.
