The fastest way to change font size on your screen
On both Windows and Mac, the quickest method is to hold Ctrl (Windows) or Command (Mac) and press the plus sign (+) to make text larger, or the minus sign (−) to make it smaller. This works in most programs — web browsers, email clients, word processors, and document readers. The change applies only to that program until you close it.
If you want the change to stick permanently in a program like Chrome or Firefox, the zoom level saves automatically. In Microsoft Word or Google Docs, you can adjust the default zoom in settings so every document opens at your preferred size.
For system-wide changes that affect everything on your screen — menus, icons, and text across all programs — you will need to adjust your display settings instead. This is the method to use if reading text at the default size causes eye strain or if you have vision needs that require larger type everywhere.
Key Takeaways
- Hold Ctrl (Windows) or Command (Mac) and press the plus or minus key to zoom text in most programs when ready.
- Browser zoom saves automatically in Chrome, Firefox, and Edge, so your preferred size returns the next time you visit a site.
- To change font size system-wide on Windows, go to Settings > Display > Scale and layout and choose a percentage above 100%.
- On Mac, go to System Settings > Displays > Resolution and select "Larger Text" or adjust the resolution slider.
- Some programs like Word and Outlook have their own font size controls in the toolbar that override system settings for that document only.
Changing font size in web browsers
Every major browser — Chrome, Firefox, Safari, and Edge — responds to the Ctrl/Command plus and minus shortcut. The zoom level you set stays with that browser on that computer. If you zoom a website to 125%, it will open at 125% the next time you visit, even weeks later.
You can also access zoom controls through the browser menu. In Chrome, click the three vertical dots in the top right, look for a magnifying glass icon with a plus and minus, and adjust from there. In Firefox, use the three horizontal lines menu and find the zoom controls. Safari users can go to View > Zoom In or Zoom Out. Edge uses the three dots menu like Chrome.
If you want to reset a website back to 100%, use Ctrl+0 (Windows) or Command+0 (Mac). This clears any zoom you have set and returns the page to its default size.
Changing font size in Windows system settings
To make text larger across your entire Windows computer — in menus, dialog boxes, file names, and all programs — open Settings by pressing the Windows key and typing "Settings," then press Enter. Click System in the left sidebar, then click Display.
Under "Scale and layout," you will see a dropdown that currently shows a percentage, usually 100%. Click it and choose 125%, 150%, or 175%. Windows will ask you to sign out and sign back in for the change to take full effect. After you do, all text on your screen will be proportionally larger.
If the preset percentages do not match what you need, click "Advanced scaling" below the dropdown. You can enter a custom percentage between 100% and 500%. This method works for nearly all programs, though some older software may not scale perfectly and may appear blurry.
Changing font size on Mac
On Mac, open System Settings (called System Preferences on older versions). Click Displays in the sidebar. At the bottom of the window, you will see resolution options. Click Scaled if it is not already selected, then choose "Larger Text" or one of the other preset sizes.
If you want more control, you can adjust the resolution slider itself. Moving the slider to the left makes everything on your screen larger; moving it to the right makes everything smaller. The change takes effect when ready without requiring a restart.
For even finer control over text in specific programs, many Mac applications have their own font size settings. In Mail, go to Mail > Settings > Viewing and adjust the font size there. In Safari, use View > Zoom In or Zoom Out, the same as on Windows.
Changing font size in Microsoft Office programs
Word, Excel, Outlook, and PowerPoint all have a font size dropdown in the toolbar at the top of the window. Select the text you want to change (or click anywhere in a paragraph to change that paragraph), then click the font size box — it usually shows a number like 11 or 12 — and choose a larger size from the list. You can also type a custom size directly into the box.
If you want a specific font size to be your default for all new documents in Word, change the font size in a blank document, then go to Home > Styles (on the right side of the ribbon), right-click Normal, and choose Modify. Set your preferred font size there and click "New documents based on this template." From then on, every new Word document will open at that size.
In Outlook, you can change the default font size for emails you compose. Go to File > Options > Mail > Stationery and Fonts, then set your preferred size under "New mail messages." This does not change the size of emails you receive, only the ones you write.
Changing font size in Google Docs and Google Sheets
In Google Docs, select the text you want to change and click the font size dropdown in the toolbar — it is next to the font name dropdown and shows a number. Choose a size from the list or type a custom size. You can also use the keyboard shortcut Ctrl+Shift+P (Windows) or Command+Shift+P (Mac) to open the font size picker.
To set a default font size for all new documents you create, go to File > New > Document, then set your preferred font and size. Open that document, select all text with Ctrl+A or Command+A, explore your formatting, then save it as a template. When you create a new document from that template, it will use your default settings.
In Google Sheets, the font size control works the same way — select cells, click the font size dropdown in the toolbar, and choose your size. The zoom controls (Ctrl/Command plus and minus) also work in Sheets and will enlarge the entire spreadsheet view.
When font size changes do not work or look blurry
If you change the system-wide font size on Windows and some programs look blurry, that program may not support scaling properly. Try closing and reopening the program. If it still looks wrong, right-click the program icon, select Properties, click the Compatibility tab, and check the box for "Disable fullscreen optimizations." Click explore and OK, then restart the program.
On Mac, if text looks fuzzy after changing display resolution, try moving the resolution slider back slightly. Mac scales text at certain resolutions more cleanly than others, and sometimes a small adjustment makes a difference.
If zoom in a web browser is not saving, check that you have not set the site to never zoom. In Chrome, click the three dots menu, find the zoom controls, and make sure there is no icon indicating the site is blocked from zooming. Also clear your browser cache — sometimes old data prevents new zoom settings from saving.
Frequently Asked Questions
Will changing font size on my computer slow it down?
No. Changing font size — whether through browser zoom, system settings, or program controls — does not affect your computer's speed or performance. It only changes how large the text appears on your screen.
Can I change font size for just one program without affecting others?
Yes. Use Ctrl/Command plus and minus to zoom in a specific program, or use that program's own font size controls. System-wide changes in Windows Display settings or Mac Displays settings will affect all programs, but individual program zoom always overrides the system setting.
What is the difference between zoom and font size?
Zoom enlarges everything on the page or screen proportionally — text, images, buttons, and spacing all get bigger together. Font size changes only the text itself. In most cases, zoom is what you want because it keeps the layout readable. Font size controls are useful when you want to change text in a document you are writing.
If I change the system font size, will it affect documents I have already created?
No. Changing system-wide font size only affects how new content appears and how programs display their menus and dialogs. Documents you have already created keep their original formatting. If you want to change the font size in an existing document, you must select the text and change it manually or use the program's default formatting tools.
Why does my font size reset when I close my browser?
It should not. Modern browsers save zoom levels automatically. If yours is resetting, try clearing your browser cache and cookies, or check whether you have set the browser to delete data on exit. In Chrome, go to Settings > Privacy and security > Clear browsing data and make sure "Cookies and other site data" is unchecked in the "On exit" section.