Free Font Size Tools
One-click converters and reference charts for every CSS and print font size unit.
px to rem Converter
Convert pixels to rem with an adjustable 16px base and instant preview.
pt to px Converter
Convert print points to screen pixels (1pt = 1.333px) and back.
em to px Converter
Convert em to px and rem with any base size. Learn when to use which.
Font Size Chart
Full pt, px, em, rem and % reference table from 6pt to 72pt.
Bible Font Size Guide
What 7pt–17pt looks like, and which edition size suits your eyesight.
Printable Chart
Print a real-size A4 chart at true physical size, 6pt to 72pt.
How to Use — 3 Easy Steps
New here? It takes 10 seconds. Here's exactly what to do.
Pick two fonts
Click the font box on each panel (A & B) and choose from 200+ fonts. Search by name.
Drag the sliders
Move each slider (6–96px) to set a size. Both panels update instantly, with every unit shown below.
Type your text
Add your own text below the panels, or tap a preset chip. Then scroll to convert units or print the A4 chart.
Live Font Size Comparison
Adjust both sliders to any size. Values update live in every unit. Pick any of 200+ fonts and any text.
✏️ Custom preview text
Type anything — both panels update live. Or tap a quick sample below.
📏 Unit values (Font A ⇄ B)
Both fonts, every unit at once. Base size: 16px.
📊 Font A — size scale preview
The same font shown across common sizes. Click a row to set Font A to that size.
Font Size Converter
Type a size in any unit — every other unit converts instantly. Base: 16px = 12pt = 1em = 1rem = 100%.
What is FontSizePro?
The free font size comparison and conversion tool built for web designers, developers and publishers.
FontSizePro is a free, browser-based font size comparison and conversion tool that helps designers, developers, and publishers choose the right type size for any project. It works with the five most common CSS and print units — pixels (px), points (pt), em, rem, and percent (%) — and lets you see how any of more than 200 fonts actually looks at a given size.
Instead of relying on guesswork or table lookups, you drag two sliders, type your own text, and watch every unit value update instantly. The tool also includes a full size-scale preview, a printable A4 chart, and a Bible print-size guide, making it useful for everything from responsive web layouts to print-ready documents.
Why Font Size Matters
Readability, accessibility and cross-device consistency all depend on getting type size right.
Readability. Type that is too small makes visitors squint, zoom, or give up entirely. Research consistently shows that larger, clearly-set text improves reading speed, comprehension, and how long people stay on a page.
Accessibility. Roughly one in seven people has some form of visual impairment. Setting body text to at least 16px (12pt) and avoiding tiny captions helps content meet WCAG accessibility guidelines, so your site works for everyone — including older readers and low-vision users.
Cross-device consistency. A size that looks right on a desktop monitor can be unreadable on a phone or in print. Screen and print use different units, and em and rem scale relative to parent and root sizes in ways that behave differently. Understanding how px, pt, em, rem, and % relate is essential for responsive and print-ready design.
Perceived size varies by font. Because every typeface has a different x-height, a 12pt Verdana looks far larger than a 12pt Georgia. Comparing real fonts at real sizes side-by-side is the only reliable way to choose well.
How to Use This Tool
Compare and convert font sizes in five simple steps — no sign-up needed.
- Choose two fonts — Click the font box on panel A, then panel B, and pick from 200+ fonts or search by name.
- Set the sizes — Drag the sliders (6–96px) to compare the same text at different sizes.
- Read every unit — The unit cards below each panel show the equivalent value in pt, px, em, rem, and %.
- Type your own text — Replace the sample text to preview your real headline or body copy.
- Convert or print — Use the converter to change any unit instantly, or print the A4 chart at true physical size.
Frequently Asked Questions
Quick answers about font size units, conversions, and how FontSizePro works.
What is the difference between px, em, and rem font sizes?
px (pixels) is an absolute unit that stays the same on a given screen. em is relative to the parent element's font size and compounds as elements nest, while rem is relative to the root (html) font size and never compounds. With a 16px root, 1em and 1rem both equal 16px, but nested elements can make them diverge.
What is the recommended font size for body text on websites?
16px (12pt, or 1rem on a default 16px root) is the recommended minimum for web body text and satisfies WCAG accessibility guidance. Many modern sites use 17–18px to improve comfort on large and mobile displays.
How do I convert px to rem?
Divide the pixel value by the root font size, which defaults to 16px. For example, 32px ÷ 16 = 2rem. Adjust the base size in the converter and every unit — pt, em, and percent included — recalculates instantly.
Is this tool free to use?
Yes — FontSizePro is 100% free with no sign-up, no ads, and no limits. Everything runs in your browser and no data leaves your device.
Font Size Chart (pt ↔ px ↔ em ↔ %)
The full reference table. This chart prints perfectly — see the printable section below.
| Preview | Points (pt) | Pixels (px) | Ems (em) | Percent (%) | Common use |
|---|---|---|---|---|---|
| Ag | 6 pt | 8 px | 0.50 em | 50% | Micro (fine print) |
| Ag | 7 pt | 9 px | 0.58 em | 58% | Compact / Bible standard |
| Ag | 8 pt | 11 px | 0.67 em | 67% | Bible / footnotes |
| Ag | 9 pt | 12 px | 0.75 em | 75% | Small print |
| Ag | 10 pt | 13 px | 0.83 em | 83% | Books / body text |
| Ag | 10.5 pt | 14 px | 0.88 em | 88% | Print magazines |
| Ag | 11 pt | 15 px | 0.92 em | 92% | Documents / papers |
| Ag | 12 pt | 16 px | 1.00 em | 100% | Web body text |
| Ag | 14 pt | 19 px | 1.17 em | 117% | Headings / Large Print |
| Ag | 16 pt | 21 px | 1.33 em | 133% | Web headings / Large Print |
| Ag | 18 pt | 24 px | 1.50 em | 150% | Sub-headlines |
| Ag | 20 pt | 27 px | 1.67 em | 167% | Sub-headlines |
| Ag | 24 pt | 32 px | 2.00 em | 200% | Headlines |
| Ag | 28 pt | 37 px | 2.33 em | 233% | Posters |
| Ag | 32 pt | 43 px | 2.67 em | 267% | Posters |
| Ag | 36 pt | 48 px | 3.00 em | 300% | Large posters |
| Ag | 48 pt | 64 px | 4.00 em | 400% | Banners |
| Ag | 60 pt | 80 px | 5.00 em | 500% | Billboards |
| Ag | 72 pt | 96 px | 6.00 em | 600% | Billboards |
Printable Font Size Chart (A4)
Tap "Save as PDF" → choose "Save as PDF" as destination. Prints at 100% true physical size.
⚠️ When printing, set scale to 100% (not "Fit to Page") so each line prints at true physical size.
Browse All 200+ Fonts
Every font available in the tool, with a live preview. Click any font to load it into Font A.
Bible Font Size Guide
Bibles use point sizes from 7pt to 17pt. Here's what each actually looks like — and who it suits.
| Label | Size | Preview | Best for |
|---|---|---|---|
| Standard Print | 7 pt | The quick brown fox | Compact thinline Bibles · good eyesight |
| Medium Print | 8 pt | The quick brown fox | Everyday reading · most common default |
| Comfort / Regular | 9 pt | The quick brown fox | Regular-size Bibles · most adults |
| Large Print | 10 pt | The quick brown fox | Wide-margin & reference Bibles · over 40s |
| Extra Large Print | 11–12 pt | The quick brown fox | Study Bibles · comfortable reading |
| Giant Print | 13–14 pt | The quick brown fox | Giant Print editions · seniors, low light |
| Super Giant Print | 15–17 pt | The quick brown fox | Super Giant editions · significant visual impairment |