OTF to WOFF Converter

Convert OTF to WOFF online for free. Fast, secure, and high-quality conversion with no sign-up or software required.

Free to useNo file stored beyond 1 hourEncrypted over TLS 1.2/1.3No watermarks

or drag and drop files here

Maximum file size is 1GB

How it works

Three steps to your converted file

Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.

Upload your file

Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.

Choose an output format

Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.

Convert & download

Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.

What is an OTF file?

The OpenType Font (OTF) format is a cross-platform scalable font standard developed jointly by Adobe and Microsoft in 1996 to supersede TrueType and PostScript Type 1 formats. OTF files encapsulate outline data using either Compact Font Format (CFF) based on cubic Bézier curves (PostScript) or TrueType outlines based on quadratic Bézier curves. The format adheres to ISO/IEC 14496-22 (Open Font Format) standards and supports advanced typographic features such as ligatures, glyph substitution, and alternate characters via feature tables (GSUB, GPOS).

How to open an OTF file

OTF files enjoy native support across all major operating systems, including Windows, macOS, Linux, Android, and iOS. Users can install the font by double-clicking the file to launch the OS-native Font Viewer (Windows) or Font Book (macOS) and selecting the install option. For editing glyph paths or kerning metrics, vector graphic editors like Adobe Illustrator or dedicated typography software such as Glyphs and FontLab are required.

OTF Technical Info

Full Name: OpenType Font
Developed By: Adobe Systems, Microsoft
Initial Release: 1996
MIME Type: font/otf

What is a WOFF file?

The Web Open Font Format (WOFF) is a wrapper format for TrueType (TTF) and OpenType (OTF) fonts, developed by Mozilla, Opera, and Microsoft and standardized by the W3C in 2012. WOFF applies zlib compression to the underlying font data to reduce latency and bandwidth usage during web page rendering. The format structure includes a unique header containing metadata and private data blocks, allowing for the inclusion of licensing information without altering the original font rendering data.

How to open a WOFF file

WOFF files are designed for interpretation by web browsers (Chrome, Firefox, Safari, Edge) via the CSS @font-face rule and are not intended for desktop installation. While they cannot be opened directly by OS font viewers, users can convert WOFF files back to desktop-compatible formats (TTF/OTF) using online converters or developer tools like FontForge. Developers can inspect WOFF resources using browser Developer Tools (F12).

WOFF Technical Info

Full Name: Web Open Font Format
Developed By: Mozilla, W3C
Initial Release: 2010
MIME Type: font/woff

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Why RunConvert

The fastest way to convert any file

Purpose-built for speed, privacy, and breadth of format support.

Convert OTF to WOFF in seconds

Every OTF to WOFF conversion runs on our servers, so your device stays fast and the output quality stays intact.

Fast, cloud-powered

No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.

Secure & private

Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.

Free - no account needed

Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.

Developer API

Convert OTF to WOFF via API

Automate OTF to WOFF conversions in three steps: create a job, upload your file, then poll for the result.

# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "otf-to-woff",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "woff"
      },
      "export-result": {
        "operation": "export/url",
        "input": "convert"
      }
    }
  }'

# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.otf

# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
  -H "Authorization: Bearer YOUR_API_KEY"

Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.