FontSubsetter

TTF/OTF Glyph Subsetter & Brotli WOFF2 Web Font Shrinker

High-performance web font optimization station. Strips unused glyphs, OpenType layout tables, and hinting instructions from TTF and OTF vector fonts, compressing the resulting subset into Brotli-compressed WOFF2 files to slash web load times by up to 75%.

Purchase License ($19.99) Open Live Web Portal

Real Desktop Application Screens • Captured from the Running Program

100% Native Executable Node-Lock Verified

Head-to-Head Competitor Analysis

Why FontSubsetter is cheaper, faster, and more secure than TransType ($99) / Monotype FontPrep Cloud.

Comparison Metric	FontSubsetter	TransType ($99) / Monotype FontPrep Cloud
License Model & Price	$19.99 (One-Time Perpetual)	$99 one-time or cloud API subscriptions
Annual Financial Savings	Save $80+ every single year
Competitor Drawbacks	Sluggish font conversion, expensive single-seat licensing, lacks automated unicode-range CSS generation
Why Vivian Is Better	One-time $19.99 perpetual license, instant Brotli WOFF2 compression, automatic CSS generator, zero bloat
Execution Environment	100% Offline Air-Gapped	Mandatory cloud check-in
Runtime Telemetry	Zero Telemetry (0.00KB sent)	Cloud telemetry & user tracking

Engineering Specifications & Features

Strips unused unicode glyphs, reducing multi-megabyte CJK/Unicode fonts to compact 20KB subsets

High-compression Brotli WOFF2 conversion delivering up to 75% file size reductions

Custom character set filtering: specify exact text strings, ASCII ranges, or CSS unicode-range definitions

Precision preservation of OpenType kerning pairs, ligatures, and vertical metrics

Automated CSS3 @font-face code generator with pre-filled format declarations

Batch mode for processing entire font families (Light, Regular, Bold, Italic) simultaneously

Graphical Interface (GUI) Architecture

Visual glyph coverage grid with checkbox selectors, font file size comparison gauge (-72%), and interactive web font preview box.

Headless CLI Reference & Execution

FontSubsetter includes a headless command-line binary ready for automation pipelines, cron daemons, and CI/CD runners:

# Headless command execution:
fontsubset --subset-sample --font roboto.ttf --text 'Hello World' --format woff2 --out roboto_small.woff2
# Cryptographic node-lock activation:
fontsubset --activate YOUR-CROCKFORD-KEY

Core Architecture & Asymmetric Security

Native C++ font engine utilizing HarfBuzz and Brotli compression libraries for sub-second font subsetting.