Font Converter

Free Font Subsetter – Reduce Font File Size by Up to 90%

Remove unused characters from your fonts to dramatically reduce file size. Choose from 21 language presets, custom Unicode ranges, or extract characters from your text.

Drop your font file here or click to browse

Supports TTF, OTF, WOFF, WOFF2

Quick Presets

Choose common language scripts and symbol sets

Aa

Character Categories

Add specific character types

T

From Text

Paste text to extract unique characters

#

Custom Ranges

Specify exact Unicode ranges

Examples: U+0020-007F, 0041, U+0100-0150

How subsetting works:

  • • Combine methods: You can select multiple presets, categories, ranges, and text at once
  • • All characters are merged: The final font will include all unique characters from all sources
  • • Analyze first: Use the "Analyze Font" button to see which presets are best supported
  • • File size: More characters = larger file. Select only what you need for optimal performance

Developer & Verifier

Marcus Rodriguez

Developed by

Marcus Rodriguez

Lead Developer

Sarah Mitchell

Verified by

Sarah Mitchell

Product Designer, Font Specialist

Related Performance Guide

Subsetting Strategies

Learn when and how to subset fonts for maximum performance, with unicode-range and progressive loading techniques.

Why Subset Your Fonts?

Web fonts are one of the largest resources on any webpage after images. A typical professional font contains 1,000-20,000+ glyphs covering multiple languages, symbols, and special characters. WOFF2 fonts compress well, but the median Latin font still measures 12 KB (US-ASCII) to 19 KB (Latin Extended); a phpied.com study of 1,074 Google Fonts established these benchmarks. Fonts exceeding 20 KB for Latin subsets benefit from optimization. Unicode ranges and subsetting strategies enable you to remove unused characters, reducing file sizes by 50-90% or more. CJK font optimization is especially impactful: CJK fonts contain 10,000+ glyphs and produce significantly larger files than Latin equivalents, making subsetting essential for performance.

Upload a font in TTF, OTF, WOFF, or WOFF2 format and select characters to keep using any combination of 20 language script presets, character categories (uppercase, lowercase, numbers, punctuation, symbols), custom Unicode ranges, or raw text input. The analysis mode scans your font and shows coverage percentages for each preset before subsetting. Output includes the optimized font file with metrics showing original size, subsetted size, and percentage reduction. If your project suffers from large font file problems, subsetting is the most effective first step to take.

89%
Latin-only Website
Google Font: 140KB → 15KB
97%
English Site
Full Unicode: 800KB → 25KB
96%
CJK Subset
Chinese Font: 5MB+ → 200KB

Performance Impact: Smaller fonts mean faster page loads, better Core Web Vitals (LCP, FCP), improved SEO rankings, and reduced bandwidth costs. For sites with millions of page views, subsetting can save significant hosting costs.

Subsetter Features

21 Language Presets
Font Analysis Tool
Text Character Extraction
Custom Unicode Ranges
Combine Multiple Methods
Size Reduction Stats
Web Optimization
No File Size Limits

21 Language Presets Available

Select one or more presets to include specific language scripts and symbol sets in your subsetted font.

Basic Latin
ASCII + Western European
Latin Extended
Eastern European, Vietnamese
Cyrillic
Russian, Ukrainian, Bulgarian
Greek
Modern and Ancient Greek
Arabic
Arabic script
Hebrew
Hebrew script
Chinese Simplified
Common simplified characters
Chinese Traditional
Traditional characters
Japanese
Hiragana, Katakana, Kanji
Korean
Hangul syllables and Jamo
Devanagari
Hindi, Sanskrit, Marathi
Thai
Thai script
Vietnamese
Latin with tone marks
Math Symbols
Mathematical operators
Currency Symbols
Currency signs
General Punctuation
Common punctuation
Arrows
Arrow symbols
Emoji
Common emoji characters
Numbers Only
Digits 0-9 + basic punctuation
Web Minimal
Minimal for web use
Web Safe
Safe for Western websites

How Font Subsetting Works

1

Upload Font

TTF, OTF, WOFF, or WOFF2

2

Analyze (Optional)

See font coverage

3

Select Characters

Presets, ranges, or text

4

Generate Subset

Process & optimize

5

Download

Get smaller font file

When to Use Font Subsetting

Single-Language Websites

Remove glyphs for languages you do not support. An English-only site does not need Cyrillic, Greek, or CJK characters.

Logo & Heading Fonts

For decorative fonts used only in logos or headings, subset to just the characters you display.

CJK Websites

Chinese, Japanese, and Korean fonts can be 5-20MB. Subset to commonly used characters for massive savings.

Performance Optimization

Improve Core Web Vitals scores (LCP, FCP) by reducing font file sizes and speeding up page loads.

Icon Fonts

If using icon fonts, keep only the icons you actually use on your website.

Self-Hosted Google Fonts

When self-hosting Google Fonts, subset them since you lose Google's automatic unicode-range optimization.

Frequently Asked Questions

What is font subsetting?
Font subsetting is the process of removing unused characters (glyphs) from a font file, keeping only the ones you need. This dramatically reduces file size while maintaining visual quality for displayed text.
Will subsetting affect how my font looks?
No. Subsetting only removes characters you do not use. All displayed text will look exactly the same. Only characters not included in your subset will show fallback fonts if needed.
How much can I reduce my font file size?
Typically 50-90% reduction. For CJK fonts (Chinese, Japanese, Korean), reductions can reach 95-99% since full CJK fonts contain 20,000-70,000+ characters.
What format will my subsetted font be in?
The output format matches your input. Upload TTF, get subsetted TTF. Upload WOFF2, get subsetted WOFF2. The format is preserved while reducing the character set.
Can I combine multiple languages in one subset?
Yes! Select multiple presets (e.g., Latin + Cyrillic + Greek) and they will be combined. You can also add custom Unicode ranges and text extraction on top.
Does subsetting affect font licensing?
Most font licenses allow subsetting for web use. However, always check your specific font license. Some licenses have restrictions on modification or embedding.
Should I subset Google Fonts?
Google Fonts auto-subsets via their API using unicode-range. However, if you're self-hosting Google Fonts, subsetting is highly recommended to reduce file sizes.
What's the best preset for English websites?
"Web Safe" or "Basic Latin" covers most English content. Add "Latin Extended" if you support European languages with accents (French, German, Spanish, etc.).

Language-Specific Subsetting Guides

Learn how to optimize fonts for specific languages with our detailed guides:

Chinese Font Subsetting

Reduce CJK fonts from 5MB to 200KB

Japanese Font Subsetting

Optimize Hiragana, Katakana & Kanji

Korean Font Subsetting

Optimize Hangul syllables

Arabic Font Subsetting

RTL fonts with ligatures

Cyrillic Font Subsetting

Russian, Ukrainian, Bulgarian

Latin Font Subsetting

European languages optimization

Related Tools & Guides

Font Converter

Convert between TTF, OTF, WOFF, WOFF2, and more formats

CSS Generator

Generate @font-face CSS rules for your fonts

Complete Subsetting Guide

In-depth guide to font subsetting strategies

Unicode Ranges Reference

Technical reference for unicode-range values and character blocks

Subsetting Strategies

Advanced strategies for optimizing font subsets by language and use case

Subsetting vs Full Fonts

Compare the tradeoffs between subsetted and full font files