Read a PDF aloud, in print you can actually see

What happens to your PDF when you open it here

Most PDFs that come from a company, a bank or a government office contain real text: the letters are stored as characters, which is why you can search them or copy a line. The reader uses pdf.js, the same open-source PDF engine built into Firefox, to pull those characters out of each page inside your browser. It then joins the lines back into paragraphs, re-attaches words that were split with a hyphen at the end of a line, and shows the result in type that is much larger than the original.

Nothing is sent to BigSignPDF or anyone else to do this. The file is read from your device into the open browser tab, and when you close the tab it is gone. That matters for the documents people most often struggle to read: tenancy agreements, pension letters, medical consent forms and loan terms full of personal details.

The reader deliberately shows the words only. Tables become rows of text, pictures and logos are left out, and checkboxes and signature lines stay in the original. Use it to understand what a document says, then look at the original for anything laid out as a grid.

How big is big enough?

The Royal National Institute of Blind People describes regular print as usually 10 or 12 point, and large print as generally 16 to 18 point, with anything bigger counting as giant print. Screen sizes are measured differently from paper, so the reader shows pixels: it starts at 28 px, the screen equivalent of 21 point print, and goes up to 64 px for very low vision. Your choice of size and colours is remembered in this browser for next time.

The letters are set in Atkinson Hyperlegible, a typeface the Braille Institute released in 2019 for readers with low vision. Letters that are easy to mix up, such as a p and a q, are drawn so that each is clearly different. If glare is the problem rather than size, try white or yellow text on black; if black on white feels harsh, black on cream is gentler.

How the read-aloud voice works

Reading aloud uses the speech voices already built into your device and browser (the Web Speech API that Chrome, Edge, Safari and Firefox provide). The speed runs from half speed to double speed; 0.8 is a good setting for dense legal wording. The document is read one sentence at a time, and a scanned page in the middle is skipped automatically so the voice carries on with the next page that has text.

Some browsers also offer voices that are generated on a server over the internet. Browsers report which is which, and the reader lists the voices on your device first. Voices supplied over the internet are marked "online" in the list, because choosing one means the sentences being read are sent to that online speech service. Stay with a voice that is not marked online and the whole process stays on your device.

If the reader finds no text

A PDF made by scanning or photographing paper contains pictures of pages, not letters, so there is nothing to enlarge or speak. The reader tells you when a page is like that. You can still zoom into the original, ask the sender for the digital version, or use text recognition on your phone. Our guide on why a PDF won't read aloud walks through each of those options.

Other ways to have a PDF read to you

You may already have a read-aloud feature. In Microsoft Edge, open the PDF and choose Read aloud in the toolbar; the voice options let you change the voice and speed. In Adobe Acrobat Reader on a computer, choose View, Read Out Loud, Activate Read Out Loud, then open the same menu again and pick Read This Page Only or Read To End Of Document. On an iPhone, turn on Speak Screen under Settings, Accessibility, Read & Speak, then swipe down with two fingers from the top of the screen. On a Mac, turn on Speak selection in the same Read & Speak settings and press Option-Esc. On Android, Select to Speak reads what you tap after you switch it on under Settings, Accessibility.

Those tools read the document as it is laid out, small print included. This page is for the moments when you want to see the same words large and hear them at the same time, without installing or configuring anything.

Sources (checked 29 September 2026)

• RNIB: large and giant print (point sizes)
• Braille Institute: Atkinson Hyperlegible typeface
• MDN: Web Speech API (speech synthesis in the browser)
• MDN: local and remote speech voices
• Microsoft Edge team: Read aloud for PDF files
• Microsoft Support: Read aloud voice options in Edge
• Adobe Help: activate and use Read Out Loud in Acrobat Reader
• Apple iPhone User Guide: Speak Screen
• Apple Mac User Guide: Speak selection
• Android Accessibility Help: Select to Speak