Upload TTF or OTF files and extract family names, PostScript names, version, units per em, glyph count, and table list.
- Runs locally
- Category Developer & DevOps
- Best for Checking file type, size, metadata, and obvious mismatch signals before sharing.
What this tool does
Font File Inspector reads TrueType and OpenType font headers in the browser and exports a CSV for design systems, brand kits, frontend audits, and vendor handoffs. It reports the detected container format, family name, subfamily, full name, PostScript name, version string, units per em, glyph count, and font table inventory. Use it when a designer sends several similarly named font files, when CSS font-family names do not match filenames, when a brand package contains duplicate weights, or when you need a quick manifest before committing font files into a repo. It only reads public font tables and does not upload, subset, convert, or license-check the font.
Tool details
- Input
- Files + Text + Numbers
- The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
- Output
- Live result + Copy + Download
- The result area focuses on usable output, with copy, download, or preview actions when supported.
- Privacy
- Browser-side processing
- The main tool logic does not call an external API, so inputs normally stay in the current tab.
- Save / share
- No account required
- Open the page and use it; whether results survive refresh depends on the tool.
- Performance budget
- Initial JS <= 78 KB
- No WASM budget is declared, keeping the tool quick to open on mobile.
- Best fit
- Developer & DevOps · Designer
- Category and role tags drive related tools, internal links, and quick fit checks.
How to use
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1. Input
Paste or drop your content into the tool panel.
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2. Process
Click the button. All processing is local in your browser.
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3. Copy / Download
Copy the result or download to disk in one click.
How Font File Inspector fits into your work
Use it before upload, handoff, archive, support review, or any moment where a file needs one local check before it leaves your machine.
File jobs
- Checking file type, size, metadata, and obvious mismatch signals before sharing.
- Preparing mixed folders for upload, archive, intake, or review.
- Keeping sensitive files in the browser instead of sending them to an account-based service.
File checks
- Do not treat the extension alone as proof of the real file type.
- Review metadata before a file goes to customers, vendors, or a public page.
- Keep the original file until the copied, converted, or exported result is verified.
Good next steps
These links move the current task into a more complete workflow.
- 1 CSS Font Stack Generator CSS font stack generator — system-safe font families with full Win/Mac/Linux/Android/iOS fallback chains, with CJK fallbacks, copy as CSS/Tailwind/SwiftUI. Open
- 2 File MIME Type Inspector Upload files and inspect filename, size, browser MIME type, extension, and magic-byte signature locally. Open
- 3 ZIP Manifest Inspector Read a ZIP central directory locally and flag traversal paths, encryption, duplicate names, and risky ratios. Open
Real-world use cases
Build a brand-font manifest
Extract internal font names and table lists before adding brand files to a design system.
Debug CSS font loading
Compare family, subfamily, and PostScript names against CSS declarations and design-tool names.
Common pitfalls
Assuming the filename is the same as the internal family name.
Committing font files before recording where they came from and what license applies.
Privacy
Font tables are parsed locally. The output lists internal font names but does not upload the font file.
FAQ
Tool combos
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