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WOFF2 Converter
Most PopularConvert TTF, OTF, and WOFF fonts to WOFF2 format. 30-50% smaller files with Brotli compression.
TTF to WOFF2OTF to WOFF2Variable fontsInstant conversion
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Font Tools
Free browser-based tools for font optimization. All processing happens locally — your fonts never leave your device.
Quick Answer
Best free font tool: Sift's all-in-one optimizer handles WOFF2 conversion, subsetting, and variable font instancing in one step. For just conversion, use the WOFF2 Converter. All tools are 100% free with no limits.
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100% Private — All tools run in your browser using WebAssembly. No files are uploaded to any server.
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Font Subsetter
Coming SoonRemove unused glyphs to achieve 70-95% file size reduction. Choose presets or paste custom text.
Latin subsetCustom textUnicode rangesPreview glyphs
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Variable Font Analyzer
Coming SoonExplore variable font axes, test weight/width/slant ranges, and export specific instances.
Axis explorerInstance previewExport instancesSize comparison
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Font CSS Generator
Coming SoonGenerate optimized @font-face CSS with proper font-display and unicode-range settings.
@font-facefont-displayunicode-rangeFallback stack
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Font Comparison
Coming SoonCompare two fonts side-by-side. Check metrics, glyphs, and file sizes.
Visual diffMetrics comparisonGlyph coverageSize analysis
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Google Fonts Optimizer
Coming SoonGenerate optimized self-hosting code for any Google Font with subsetting.
Self-hostingOptimal subsetsPreload hintsPrivacy-friendly
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Want Everything in One Step?
Sift's main tool combines all features: upload any font, adjust variable axes, subset characters, and export optimized WOFF2 — all in one workflow.
Try the Full Optimizer