Free online HTML viewer

HTML viewer online

Paste HTML or drop a .html file below. The page renders instantly in your browser. Free, no signup. Toggle mobile preview, switch to slide-deck Present mode, or share a link for collaborative review.

Drop a file or click to upload
Up to 1 MB · stays in your browser

The page is rendering above. Sandboxed iframe, no cross-tab access. Free, no signup, files stay in your browser until you click Share.

What you get

Instant render

The HTML renders the moment the file lands. No build step, no preview server, no localhost rituals.

Mobile + desktop preview

Toggle a 390-pixel viewport to check how the page reads on iPhone. Useful for email HTML and landing pages.

Present mode for decks

Files that look like slide decks (sections with class "slide") get arrow-key navigation automatically. No JS required from your side.

Comments and share-link

Hand the page to a reviewer with a docs.vela.partners URL. Inline comments anchored to text ranges, Google-Docs idiom.

Vela Docs vs. other ways to view HTML online

HTML viewers fall into three buckets: browser-open-in-a-tab (no extras), code playgrounds (built for the authoring case), and viewer microsites (often paywalled or ad-heavy). Here's how Vela compares.

 Vela DocsCodePenJSFiddleBrowser tab
Free + no signup to viewyesfree tierfree tieryesyes
Drop a .html fileyesnonoyes
Mobile preview toggleyespaidpaidnodevtoolsdevtools
Slide-deck Present modeyesnonono
Inline comments on shareyesnonono
Real-time co-editingyespaidpaidnono

Common questions

Is there a free online HTML viewer?
Yes. Vela Docs is a free online HTML viewer with no signup required. Drop a .html file (or paste HTML directly into the editor) and the page renders immediately in the browser. You can also switch to Edit, Code, or Present mode without leaving the page.
How do I view HTML online without installing anything?
Open https://docs.vela.partners in any modern browser. Drop a .html file onto the page or click the upload button. The HTML renders in a sandboxed iframe so the page can run its own scripts safely. No install, no signup.
Can I preview HTML in a mobile-sized viewport?
Yes. The viewer has a Mobile toggle that renders the page at 390 pixels wide (iPhone reference width). Useful for previewing email HTML, landing pages, or AI-generated mobile mockups before sending them to a designer.
Does the viewer support slide-deck HTML?
Yes. If the file uses the common slide pattern (sections with class "slide" or "page"), the Present mode activates arrow-key navigation between slides, plus space and PageUp/PageDown shortcuts. Files that don't match the pattern render normally.
Is it safe to render arbitrary HTML?
Vela Docs renders HTML inside a sandboxed iframe with no same-origin access. Embedded scripts can run inside that sandbox but cannot read your other tabs, your cookies, or your local files. The page can make outbound network requests to its own endpoints, so only render files from senders you trust.
Can I save my HTML view as a link to share?
Yes. Click Share at the top of the editor, sign in with Google or magic-link email, and you'll get a docs.vela.partners/d/... URL. The viewer also supports inline comments for collaborative review.
Difference between this and a code playground like CodePen or JSFiddle?
CodePen and JSFiddle are great when you're building UI from scratch with separate HTML / CSS / JS panes. Vela Docs is for the case where you already have a complete .html file (typically AI-generated) and just need to view or share it. Drop, render, share. Less infrastructure, more speed for the common case.

Need to edit, not just view? How to open and edit an HTML file.

Working with a team? Collaborative HTML editor.