PDF text too small? Here's how to make it bigger
Contracts, bank letters and forms are often set in tiny type, and a PDF doesn't let you simply pick a bigger font the way an email does. You still have good options on every device: zoom, the magnifier built into your phone or computer, a reading view that re-flows the text, or a large-print copy. This page explains each one and when it helps.
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Updated 27 October 2026 · Written by Joe Farwick, who runs this site
Why you can't just change a PDF's font size
A PDF is built like a printed page: every word sits at a fixed position, so the document looks the same on every device. That is why a PDF viewer offers zoom but not a font size setting. When you zoom, the whole page grows, the lines get longer than your screen, and you end up scrolling left and right on every line.
The way round this is reflow: taking the words out of the page and letting them wrap to the width of your screen. Adobe describes Reflow in Acrobat Reader as showing PDF text in large type and turning several columns into one readable column. The large-print reader on this site does the same in your browser, without installing anything.
Four ways to enlarge a PDF
Zoom: Makes the whole page bigger, pictures and layout included. Good for a quick look; tiring for long text because you scroll sideways.
Screen magnifier: Built into Windows, Mac, iPhone and Android. Enlarges whatever is on screen, in any app, including the signing page itself.
Reflowed text: A reading view that takes the words out of the fixed layout and wraps them, so large type fits the screen without sideways scrolling.
Large-print copy: A new PDF with the same words in 18 to 32 point type, for reading on paper. It is a reading aid, not the document you sign.
On an iPhone or iPad
Pinch to zoom works in Files, Mail and Safari. For more, turn on Zoom under Settings, Accessibility, Zoom; then double-tap the screen with three fingers to magnify everything, including apps that don't let you pinch. Zoom can magnify the full screen or just a movable window, and it has filters such as inverted or grayscale colours.
Recent versions of iOS also include Accessibility Reader under Settings, Accessibility, Read & Speak, which shows text in a full-screen view with your choice of font, layout and background colour, and can read it aloud. The text size setting under Display & Brightness makes menus and apps bigger, but it does not change the print inside a PDF.
On an Android phone or tablet
Pinch with two fingers in the PDF viewer or the Gmail attachment preview. For a magnifier that works everywhere, go to Settings, Accessibility, Magnification and turn on the Magnification shortcut. You can then tap the Accessibility button, hold both volume keys or triple-tap the screen, depending on the shortcut you chose, and move around with two fingers while zoomed in.
On a Windows PC or a Mac
Ctrl and + (Cmd and + on a Mac) zooms the PDF in Edge, Chrome, Firefox and most PDF apps. Windows also has Magnifier: press the Windows logo key and the plus sign to turn it on, and the Windows logo key and Esc to turn it off. Its zoom level can be set under Start, Settings, Accessibility, Magnifier. On a Mac, turn on Zoom under Apple menu, System Settings, Accessibility, Zoom, and switch on the keyboard shortcuts; Option-Command-Plus then zooms in and Option-Command-Minus zooms out.
If long documents are the problem rather than single lines, have the text read to you. Edge can read a PDF aloud from its toolbar, and our guide on PDFs that won't read aloud covers the other options.
When the printout is too small
Printing a PDF usually reproduces the original page, small print and all, and a document designed for a different paper size can come out even smaller once it is shrunk to fit. Look in the print window for the scaling option and choose actual size rather than shrink or fit; if you have a printer for bigger paper, an A4 page printed on A3 comes out about 40 percent larger, and a Letter page on Tabloid about 30 percent larger.
For real large print, download a large-print copy from our reader in 18, 24 or 32 point. The Royal National Institute of Blind People treats 16 to 18 point as large print and anything larger as giant print. Remember that this copy only contains the words; sign the original document, not the reading copy.
Sources (checked 29 September 2026)
The quickest fix on each device
Try the first line for your device. If it isn't enough, the sections above go further.
- 1
Windows or Mac
In the browser or PDF viewer, hold Ctrl (Cmd on a Mac) and press + to zoom in, or 0 to go back to normal size.
- 2
iPhone, iPad or Android
Put two fingers on the page and spread them apart. Turn the phone sideways so the page uses the full width.
- 3
Still too small or too cramped
Open the PDF in the free large-print reader on this site: it shows just the words, wrapped to your screen, in type up to 64 px.
A signer for anyone unsure what to click: large text, big buttons and three plain steps from opening the PDF on your computer to saving it signed. Nothing is uploaded.
Loading editor...
Make the words themselves bigger
Zoom enlarges the whole page. The free reader takes the text out of the PDF and wraps it to your screen in type up to 64 px, with a read-aloud button. Nothing is uploaded.
Questions about small print in PDFs
- Will zooming change the document?
- No. Zoom, magnifiers and the large-print reader only change what you see. The PDF itself stays exactly as it was sent.
- Why is the text blurry when I zoom in?
- The PDF is probably a scan, which is a picture of paper. Pictures get blurry when enlarged, and a reader can't reflow them. Ask the sender for the original digital file.
- Can I make the signing page bigger too?
- Yes. The signer already uses a larger base size, and browser zoom or your device's magnifier enlarge it further. The buttons keep working while zoomed in.
- Is the large-print copy free, and what does signing cost?
- The reader and its large-print copy are free, with no account. Signing is free to try; saving the signed PDF needs a plan at €2.99 a month or €24.99 a year, and you can cancel at any time.
Can read it now? Sign it here
Open the original PDF above; the signer's text and buttons are larger than usual too.
Choose the document