Quick answer: to read a PDF online, open it on this page. It appears straight away with every page in one scrolling view. Use the search box to find words, the sidebar for page thumbnails and bookmarks, the zoom buttons or Fit width to size it, and night mode for reading in the dark. The PDF is opened on your device and never uploaded.
Key facts
- Price: free, with no account, no ads inside the viewer and no installation.
- Private: the file is read from your device by your browser. It is not uploaded, so confidential documents stay confidential.
- Full-featured: continuous scrolling, zoom from 25% to 400%, fit width and fit page, rotate, text selection and copy, search with highlighted matches, clickable links, bookmarks and thumbnails.
- Comfortable reading: night mode, full screen and the viewer remembers the page you were on.
- Fast with big files: pages are drawn as you reach them, so even documents with hundreds of pages open quickly.
- Works everywhere: Windows, Mac, Linux, ChromeOS, Android and iPhone.
How to open and read a PDF online
- Open your PDF. Click Open PDF or drop the file on the page. The first pages appear at once.
- Move around. Scroll, type a page number, use the arrows, or click a thumbnail or bookmark in the sidebar.
- Find text. Type in the search box (or press Ctrl+F / ⌘F). Every match is highlighted; press Enter or the arrows to jump between them.
- Adjust the view. Zoom, choose Fit width or Fit page, rotate sideways pages, switch to night mode or go full screen.
- Print or save. Use the print and download buttons when you need a paper or local copy.
Why use an online PDF reader?
- No software to install: handy on work computers, school Chromebooks, borrowed laptops and phones where you cannot or do not want to install apps.
- No upload: many “online” readers upload your file to their server first. Here the file never leaves your device.
- Better than a basic preview: phone and email previews often have no search, no bookmarks and no way to select text. This viewer has all of them.
- One place for the next step: when you need to change the document, CleanPDF has the tools ready: compress, merge, fill forms, sign or extract the text.
Keyboard shortcuts
| Keys | Action |
|---|---|
| Ctrl + F (⌘ + F on Mac) | Search in the PDF |
| Enter / Shift + Enter | Next / previous search match |
| Ctrl + plus / Ctrl + minus | Zoom in / out |
| Page Down / Page Up, → / ← | Next / previous page |
| Esc (in the search box) | Clear the search |
Reading comfortably
Night mode turns white pages dark and black text light, which is easier on the eyes at night and saves battery on OLED phone screens. Pictures are kept in natural colours as far as possible. Fit width is best for reading text on a computer, Fit page for slides and posters, and full screen hides everything except the document. The viewer remembers your page for each file on this device, so you can close the tab and continue later.
Privacy and security
Your PDF is opened with the same open-source PDF engine (pdf.js) that Firefox uses, running inside your browser. The file is not uploaded, stored or seen by anyone. Links inside a PDF open in a new tab, and scripts embedded in PDFs are not run, which keeps you safe from malicious documents.
Good to know
- Scanned PDFs can be read and zoomed, but their text cannot be searched or selected because it is only an image. Make them searchable text with PDF to Text (OCR).
- Forms are shown but not editable here. To type into a form, use Fill PDF Form.
- Password-protected PDFs must be unlocked first with Unlock PDF.
- Very large files (thousands of pages or huge scans) depend on your device's memory, especially on older phones.
Frequently asked questions
How can I open a PDF online for free?
Open this page, click Open PDF and choose the file. It opens immediately in the viewer. It is free with no sign-up and no installation.
Is my PDF uploaded when I view it?
No. The PDF is opened by your browser on your own device and is never uploaded, stored or shared.
Can I search for words in the PDF?
Yes. Type in the search box or press Ctrl+F. All matches are highlighted and you can jump between them with Enter or the arrow buttons.
Can I copy text from the PDF?
Yes. Select text with the mouse or your finger and copy it, just like on a web page. Scanned PDFs need OCR first.
Does the viewer show bookmarks?
Yes. If the PDF has bookmarks, open the sidebar and choose Bookmarks to see the table of contents and jump to any chapter.
How do I read a PDF in dark mode?
Press the moon button in the toolbar. The pages switch to light text on a dark background. Press it again to return to normal.
Will it remember where I stopped reading?
Yes. When you open the same file again on the same device, the viewer goes back to the page you were reading.
Can I open a PDF on my phone without an app?
Yes. Open this page in your phone's browser and choose the PDF. Zoom, search, thumbnails and night mode all work on Android and iPhone.
Is this a safe way to open a PDF from an unknown sender?
It is safer than many apps: the file stays on your device, embedded scripts are not run and links only open when you click them. Still, do not enter passwords on pages a document links to unless you trust the sender.
Can I print the PDF?
Yes. Press the print button to send the original PDF to your printer, or download it with the download button.
Can I edit the PDF in the reader?
The reader is for viewing. To change the document, use tools such as Add Text or Image, Fill PDF Form, Sign PDF or the PDF Editor.
Does it work with large PDFs?
Yes. Pages are drawn only when you scroll to them, so long documents open quickly. Extremely large scans depend on your device's memory.