How to Batch Convert Font Files for Free

The WildandFree Font Converter is designed for fast, one-at-a-time conversions — drop a file, get a file, move on. If you need to convert 5 fonts, that's 5 quick drops. If you need to convert 200 fonts, that's not the right tool for the job.

For batch conversion — converting a whole directory of fonts in one operation — the fonttools Python library handles this cleanly and for free. This guide covers both approaches.

Browser-Based Converter — Best for Single Files

The browser converter is the fastest path for one to five fonts:

• No install or setup
• Drop a file, pick a format, download the result
• Handles TTF ↔ OTF ↔ WOFF in any direction
• File never leaves your machine

For a small number of conversions, this is faster than installing Python and fonttools. Use it for spot conversions, one-off client files, or any situation where setup time would outweigh the benefit.

fonttools — Batch Convert an Entire Directory

fonttools is a free Python library used by font professionals for large-scale font processing. Install once:

pip install fonttools

Then convert an entire folder of TTF files to WOFF:

for f in fonts/*.ttf; do
  python3 -m fonttools ttLib.makeStaticInstance "$f" --flavor woff -o "woff/$(basename ${f%.ttf}).woff"
done

Or the simpler approach using pyftsubset (also part of fonttools):

for f in fonts/*.ttf; do
  fonttools ttLib -o "woff/$(basename "$f" .ttf).woff" "$f"
done

For WOFF2 batch conversion (requires the brotli package):

pip install fonttools brotli
for f in fonts/*.ttf; do
  python3 -m fonttools ttLib.woff2 compress "$f"
done

This processes every TTF in the fonts/ directory and outputs a WOFF2 file next to each source file.

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Batch Font Conversion on Windows

On Windows, the loop syntax is slightly different. In PowerShell:

Get-ChildItem "C:onts*.ttf" | ForEach-Object {
    python -m fonttools ttLib.woff2 compress $_.FullName
}

Or in Command Prompt:

for %f in (C:onts*.ttf) do python -m fonttools ttLib.woff2 compress "%f"

Install Python first from python.org (check "Add Python to PATH" during install), then pip install fonttools brotli in a Command Prompt or PowerShell window.

Choosing the Right Tool for Your Scale

A practical decision framework:

• 1–5 fonts: Browser converter. Drop, download, done. No setup time.
• 6–20 fonts: Either works. Browser converter is still manageable. fonttools starts to pay off if you've already installed it.
• 20+ fonts: fonttools. The loop setup takes 5 minutes; processing 50 fonts takes another 10 seconds.
• Recurring workflow: fonttools. Once the script exists, you run it again whenever you get new fonts.

For studios managing a large shared font library, the fonttools approach also produces consistent output — same compression settings, same naming conventions — which is harder to guarantee with manual one-at-a-time conversions.

Naming Output Files During Batch Conversion

A common batch conversion requirement is outputting to a separate folder with a consistent naming convention. Here's a pattern for macOS/Linux that outputs all conversions to an output/ subfolder:

mkdir -p output
for f in fonts/*.ttf; do
  name=$(basename "$f" .ttf)
  python3 -m fonttools ttLib.woff2 compress "$f" -o "output/${name}.woff2"
done

Adjust the extension and conversion command for WOFF or OTF output. The basename trick strips the directory path and original extension to build the output filename cleanly.

Frequently Asked Questions

Is there a free online batch font converter?

Most online font converters handle one file at a time. For true batch conversion, fonttools (free Python library) is the standard solution — it processes entire directories in a single shell command.

How do I convert 100 TTF files to WOFF at once?

Install fonttools with `pip install fonttools`, then run a shell loop: `for f in fonts/*.ttf; do python3 -m fonttools ttLib.woff2 compress "$f"; done`. For WOFF (not WOFF2), adjust the fonttools command to use the woff flavor flag.

Does the browser font converter support batch conversion?

No — it converts one file at a time. For batches of more than a few fonts, fonttools is the better tool. The browser converter is fastest for quick single-file conversions with no setup.