HTML Viewer, PDF Viewer, and JSON Formatter Online

Use this tool

HTML Viewer

Paste HTML and preview it in a sandbox. Script execution is disabled in this preview.

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Quick guide and practical context

HTML Viewer with sandbox preview

Paste markup and inspect rendering immediately inside a sandboxed iframe. This is useful for structure validation, UI snippet checks, and quick layout review.

Even with sandbox isolation, avoid running untrusted production-grade code. The intended use is safe visual inspection, not full script execution testing.

Local PDF Viewer in the browser

When you select a PDF, the preview uses a temporary local blob URL. The file stays on your device and is not uploaded by default.

This workflow is practical for checking contracts, manuals, and technical docs without sharing sensitive files through external services.

JSON formatter and minifier

The JSON panel supports both pretty-print and minify mode. Parsing errors are surfaced with readable feedback to speed up debugging.

It is useful for API payload inspection, documentation cleanup, and preparing compact JSON for transport.

Pretty-print JSON for review.
Minify JSON for transfer.
Copy the processed output with one click.

Frequently asked questions

Is the PDF uploaded to a server?

No. The file is read and displayed locally in your browser using a temporary URL.

Can I execute JavaScript in the HTML Viewer?

The preview uses a restricted sandbox without script execution permissions to reduce risk.

What happens if the JSON is invalid?

The formatter returns a clear error message so you can fix syntax issues before copying.

Does it work on mobile?

Yes. The layout is responsive and key actions remain accessible on smaller screens.

Do I need an account to use it?

No. All features are available for free without sign-up.

Light internal links for contextual discovery and better crawl flow.

Crypto Unit Converter

Convert satoshi, gwei, wei, lamport, sun, lovelace, and other on-chain units with local calculation only.

QR Code Generator with Logo

Create QR codes for text or URLs with no sign-up, add logo branding, and export to multiple file formats.

Privacy and local processing

Tools on this page run directly in your browser and do not send entered content to a backend. This improves privacy and reduces latency.

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Sugestão: Responsivo 728x90 / 320x100

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