Zero-latency sandbox · client-only

Drop your files. Watch them run.

ReztXeditor takes HTML, CSS, JavaScript, PHP and SQL files you already have, sorts them into folders on its own, and gives you a live preview at every screen size — no server, no build step.

Open the editor How it works

Everything runs in your browser. Nothing you upload leaves your machine.

index.html — running

<button onclick="clap()">
  Clap
</button>

<script>
function clap() {
  count++
  render()
}
</script>

0 KB

sent to any server

5 stacks

html · css · js · php · sql

100%

client-side, offline-capable

~500ms

live-reload turnaround

Engine capabilities

What it does with your files

Four jobs, handled the moment you drop something in.

auto-organize

Upload loose files or a whole .zip. ReztXeditor reads each extension and files it under html/, css/, js/, php/, sql/ or assets/ for you.

zip + parsed tree ready

multi-language runner

HTML, CSS and JS run together as one page. SQL runs against an in-browser database, and PHP executes through a WebAssembly runtime.

PHP · SQLite (WASM) 0 config

live multi-size preview

Run the page inside a mobile, tablet or desktop frame, pop it into its own tab, or go fullscreen — and watch it update as you edit.

viewport switcher active

built-in audit

Check the current page's SEO, performance and stability with one click, and get an overall score before you export.

score radar 98 / 100

Runtime architecture

Evaluated and rendered without a server round-trip.

Unlike cloud sandboxes that suffer from container cold-starts, ReztXeditor runs PHP through a WebAssembly interpreter and SQL against an in-memory SQLite database compiled to WebAssembly — both execute on your CPU, in the tab, the moment you press Run.

PHP

Runs through a WebAssembly PHP runtime. Experimental — depends on a third-party CDN build.

SQLite 3 (WASM)

An in-memory relational store with a direct query runner — no server, resets each run.

Integrated Quality Audit passed

Performance & first paint100 / 100

SEO & document headings96 / 100

Script & lint stability99 / 100

> audit completed in 14ms — this is a real screenshot of the in-app Audit tab.

Simple pipeline

Three steps, in order

Frictionless orchestration from drop to export.

Upload

Select files or a .zip, import from a URL or GitHub repo, or drag files onto the file panel.

Edit & run

Pick an entry file, add dependencies if you need them, and press Run to preview it.

Audit & export

Run the built-in audit, then download the organized project as one .zip.

Zero installation workspace

Ready to start building?

No signups, zero configuration. Instant workspace execution straight from your browser.

Launch ReztXeditor