What is PDF Viewer?

PDF Viewer lets you open and read PDF files without installing any software. Navigate pages, zoom in and out, rotate pages, and jump to any page — your files never leave your device.

Pages render through PDF.js on a canvas right on your device, so the original file is never uploaded anywhere. Tools include fit-to-page, fit-to-width and actual-size zoom presets, free zoom in 10% steps, 90-degree page rotation, jump-to-page input, and arrow-key navigation. A side panel of page thumbnails lets you skim a long document and jump in one click. Switch to continuous scroll to read top-to-bottom like a web article, or use Ctrl+F to search every page for a word or phrase and step through the hits. Works on phones and tablets too.

How to use

1. Upload or drag and drop a PDF file to open it in the viewer.
2. Use the toolbar to zoom, rotate, or jump to specific pages using the page navigator.
3. Navigate through pages using arrow buttons, keyboard shortcuts, or the page number input.

When to use

• Reading a PDF on a public or borrowed computer that has no PDF reader installed.
• Previewing an attachment on a phone without launching a bloated PDF app.
• Reviewing a long document with the page-rotation control when scans are upside-down.

Result

A colleague sends you a PDF manual but you're on a shared computer without a PDF reader installed. Open this tool, drop the file in, and read through all 50 pages with smooth scrolling and zoom — no installation required.

FAQ

How is this different from just opening a PDF in Chrome or Safari?

Built-in browser viewers vary in features and skip mobile entirely on iOS Safari, where PDFs open as a download. Here you get consistent fit modes, rotation, and keyboard navigation in every browser, including mobile.

Are my files uploaded somewhere when I open them?

No. The PDF is read into memory by your browser via the File API and rendered locally by PDF.js. Closing the tab discards it. There is no server upload, no account, and no recent-files list saved between sessions.

Can I highlight, annotate, or sign the PDF here?

You can highlight passages and drop sticky notes while you read — pick the highlighter or note tool in the toolbar. These marks stay private on this device and are not written back into the file; they clear when you close the tab. For a signature drawn onto the PDF use our PDF Signature tool, and to pull pages out as pictures use PDF to Image.

Why are some pages blurry until I scroll to them?

We render pages on demand to keep memory and battery use low. As you scroll, each page is rasterised in turn. On slow devices that produces a moment of blur; sticking to fit-to-width helps because each page renders at a friendlier size.

Does it open password-protected PDFs?

PDFs encrypted with a user password will prompt you for that password before pages render. Owner-locked PDFs that restrict printing or copying open normally for reading, since reading was never the locked operation.

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