The quickest way to adjust text size
On any Kindle e-reader or Kindle app, you change font size while you are reading. Open a book, tap the middle of the screen, and a menu bar appears at the bottom. Look for the font icon — it looks like an "A" with an up or down arrow next to it. Tap the up arrow to make text larger, or the down arrow to make it smaller. The change takes effect when ready on that page and stays set for all future books you read.
If you are using a Kindle app on a phone or tablet instead of a dedicated e-reader, the process is identical. The menu bar works the same way across all Kindle devices and apps.
You can also access more detailed text settings from the same menu. Tap the three horizontal lines (called a hamburger menu) on that bottom bar, then select "Text" or "Display Settings" depending on your device. From there you can adjust line spacing, margins, and font choice in addition to size.
Key Takeaways
- Tap the middle of the page while reading to bring up the menu bar, then use the font icon with arrows to increase or decrease text size.
- Font size changes explore when ready and carry over to every book you read going forward.
- The hamburger menu (three horizontal lines) on the same bar gives you access to line spacing, margins, and font style choices.
- On Kindle e-readers with physical buttons, you can also hold down the font size button to cycle through sizes without opening the menu.
Where the font menu appears on different Kindle devices
On a Kindle Paperwhite, Kindle Basic, or Kindle Oasis, tap anywhere in the middle of the page to wake up the reading toolbar. The font icon sits on the bottom bar next to the brightness control and page progress indicator. Tap it once to open the size slider.
On older Kindle models with physical buttons (like some Kindle Keyboard versions), you can press and hold the font size button on the device itself — usually marked with an "A" — to cycle through available sizes without touching the screen.
If you are reading on the Kindle app for iPhone, iPad, Android, Mac, or Windows, the same tap-the-middle-of-screen rule applies. The menu bar appears at the bottom with the font icon in the same position as on e-readers.
How many font sizes are available
Kindle offers eight different font sizes, ranging from very small (good for readers who want more words per page) to very large (useful for readers with vision difficulties or those who prefer less text density). You can move through them one at a time using the arrow buttons, or drag the slider to jump directly to the size you want.
The actual physical size of the text depends on your device's screen. The same font size setting will look larger on a 10-inch Kindle Scribe than on a 6-inch Kindle Paperwhite, because the screen is bigger. If you switch between devices, you may want to readjust the size to match what feels comfortable on each one.
Saving your preferred size across books
Once you set a font size, Kindle remembers it. Every new book you open will start at that same size. You do not have to reset it each time you begin reading.
If you change the size while reading one book, that new size becomes your default for all future books. There is no way to set different default sizes for different books or genres — the setting is device-wide (or app-wide if you are using the Kindle app).
If you share a Kindle device with another person, each person's account has its own font size preference. When you sign in with your Amazon account, your preferred size loads automatically. When the other person signs in with their account, their preference takes over.
Combining font size with other text settings
Font size works alongside other text controls that give you more control over how pages look. From the same menu bar, you can adjust line spacing (the gap between lines of text), margins (the white space on the sides), and font style (serif fonts like Georgia, or sans-serif fonts like Helvetica).
These settings are independent. You might prefer large text with wide line spacing and narrow margins, or small text with tight spacing and wide margins. Experiment with combinations to find what feels easiest to read for long periods.
On Kindle e-readers, you can also adjust the brightness or warmth of the screen (on models with a front light or color display). These lighting adjustments do not affect font size but work together with it to reduce eye strain during reading.
What to do if the font menu does not appear
If you tap the middle of the screen and nothing happens, the book may be in a format that does not support text adjustment — usually a PDF or a fixed-layout book (like a graphic novel or children's book with illustrations). These formats lock the text size and layout to match the original design.
Try tapping a different part of the screen, or wait a moment and tap again. Sometimes the menu takes a second to respond. If the menu still does not appear, check whether you are in a reading mode that disables the toolbar — some Kindle apps have a "full screen" or "immersive" mode that hides controls.
If you are using the Kindle app and the menu does not appear, try closing and reopening the book. If the problem persists, restart the app or check that you have the latest version installed from your device's app store.
Font size and battery life on e-readers
Changing font size does not affect how long your Kindle e-reader's battery lasts. E-ink displays use power only when the page refreshes — when you turn to a new page or adjust a setting. Larger text does not consume more power because the display technology does not work that way.
The only text-related setting that can affect battery life is the front light (on models that have one). Using the light at full brightness drains the battery faster than using it at a lower brightness level. Font size itself has no impact.
Frequently Asked Questions
Can I make the font bigger than the largest setting?
No. The largest of the eight available sizes is the maximum. If that size is still too small, you can try increasing line spacing or margins from the text settings menu, which can make the page feel less crowded and easier to read. Some readers also find that switching to a sans-serif font (like Helvetica) feels clearer at smaller sizes than serif fonts do.
Does font size change affect how many pages a book has?
Yes. When you increase font size, the same text spreads across more pages because fewer words fit on each page. The page count shown in your Kindle will increase. When you decrease font size, the page count decreases. This is normal and does not mean the book content has changed.
Will my font size preference sync across my devices?
No. Each device or app stores its own font size preference separately. If you read on a Kindle Paperwhite and also on the Kindle app on your phone, you can set different sizes on each one. Your phone app will not automatically match the size you chose on your e-reader.
Can I change font size on a book I borrowed from Kindle Unlimited?
Yes. Borrowed books work exactly like books you own. You can adjust font size, line spacing, and all other text settings the same way. The changes explore only while you are reading that borrowed book and do not affect the original file.
What if I want to go back to the default font size?
There is no "reset to default" button. To return to the middle font size (which is what most readers find comfortable), open the font menu and drag the slider to the center position, or tap the up and down arrows until you reach the size you want. The middle of the eight available sizes is usually a good starting point.