OTF to WOFF Converter
Pack OpenType SFNT into WOFF for @font-face fallbacks.
OpenType SFNT packed into WOFF (zlib) on-device. Outlines are not redrawn.
Choose a file or drag and drop
Drop your OTF file here or
Choose file · Drag & drop · Public file link
- Processed on your device
- No conversion file stored on our servers
- Maximum file size: 100 MB
Conversion runs in your browser. Files are not uploaded to Format Convertly servers.
Processed on your device
No conversion file stored on our servers
Conversion Settings
Customize the output to match your needs.
Convert Quality
92%Quality slider applies when the target is JPG, WebP, or AVIF.
Output
Output options for this format are applied automatically during browser conversion. Drop your file above to begin.
Advanced settings
Additional Options
How to Convert OTF to WOFF
Add your OTF
Drop a OTF file into the browser panel. Nothing is sent to a remote queue.
Confirm settings
Review optional quality/size settings, then confirm WOFF as the output.
Download WOFF
Convert locally and download the WOFF file when processing finishes.
Why Convert OTF to WOFF?
Private by design
OTF → WOFF runs in your browser. Files are not uploaded to a remote conversion queue.
Ready for the next step
Convert when a site, editor, or teammate expects WOFF instead of OTF.
Preserve detail
WOFF: zlib. Typically lossless or lightly transformed for editing and archival use.
Wide compatibility
OTF is commonly used for Professional layout and branding and Advanced typographic features.
OTF vs WOFF
A quick side-by-side before you convert — deeper comparison lives on the full guide.
| Feature | OTF | WOFF |
|---|---|---|
| Kind | font | font |
| Compression | none | zlib |
| Lossy / lossless | Lossless / not lossy | Lossless / not lossy |
| Transparency | Not supported / N/A | Not supported / N/A |
| Best for | Professional layout and branding; Advanced typographic features | Web font fallback stacks; Older @font-face pipelines |
| Typical size | 50 KB – several MB | Typically smaller than raw TTF/OTF |
| Browser / web support | Prefer WOFF2 for web delivery | Excellent |
| Compatibility | Excellent in design tools; convert CFF OTFs carefully when targeting TrueType-only pipelines | Works with CSS @font-face in browsers; not meant for OS font installation — keep TTF/OTF for desktop installs |
Choose OTF when…
- Professional layout and branding
- Advanced typographic features
- Print design
- Desktop font libraries
Choose WOFF when…
- Web font fallback stacks
- Older @font-face pipelines
- Licensed web embedding
- Converting desktop fonts for the browser
What happens to quality?
OTF: OTF compression: none. Lossless (or non-destructive packaging) keeps reconstructable data — size savings come from packing efficiency, not throwing detail away. Typical size profile: 50 KB – several MB. Quality note: Lossless vector outlines WOFF: WOFF compression: zlib. Lossless (or non-destructive packaging) keeps reconstructable data — size savings come from packing efficiency, not throwing detail away. Typical size profile: Typically smaller than raw TTF/OTF. Quality note: Lossless outlines with container compression OpenType SFNT packed into WOFF (zlib) on-device. Outlines are not redrawn.
Tip
Keep an original copy of your OTF file if you may need to reconvert later.
When should I use WOFF?
WOFF: WOFF wraps TTF/OTF data with compression for CSS @font-face. Prefer WOFF2 today for smaller files, but WOFF remains a useful fallback in some pipelines. Best for Web font fallback stacks and Older @font-face pipelines.
WOFF format guide →When should I keep OTF?
Keep OTF when you still need to edit or when it already matches your audience. OTF supports rich typographic features (ligatures, alternates) used in professional design. Use OTF/TTF on the desktop; serve WOFF2 on websites when licensing allows.
OTF format guide →OTF · WOFF
Related converters OTF
Related converters WOFF
Frequently Asked Questions
More on quality loss: conversion quality guides · problem-solution guides
Does converting OTF to WOFF reduce quality?
Often no for lossless or remux-style paths. Quality drops when you re-encode with lossy settings, downscale, or flatten features like transparency.
Can you recover quality after converting?
Not from a lossy output alone. Return to the original master (or a better source). Converting to a lossless format does not resurrect discarded detail.
Where can I learn more about conversion quality?
Browse Format Convertly’s Quality guides for topics like whether conversion reduces quality, JPG↔PNG myths, WebP/MP3/MP4 tradeoffs, recovery limits, and generational loss — each links to the right converter.
Why is my font not working on the web?
Websites need WOFF2 (or WOFF), not just desktop TTF/OTF. Convert TTF→WOFF2, wire @font-face correctly, and confirm the license allows web use. Full guide: Why Is My Font Not Working on the Web?.
Where can I find more problem-solution guides?
Browse the Guides hub for long-tail fixes — HEIC won’t open, PNG too large, PDF not searchable, video too large, WebP upload failures, and more — each links to the right converter or tool.
Do you upload my font?
No. Font conversion runs in your browser with local JS/WebAssembly. Files are not uploaded to Format Convertly.
Are glyph outlines changed?
No for container conversions (TTF/OTF ↔ WOFF/WOFF2). Outlines stay the same; only the wrapper/compression changes. CFF→TrueType redraw is not supported in-browser.
What is a OTF file?
OTF is OpenType Font — an advanced scalable font format extending TrueType/CFF outlines. OTF supports rich typographic features (ligatures, alternates) used in professional design. Use OTF/TTF on the desktop; serve WOFF2 on websites when licensing allows.
Related problems
Ready to Convert Your Files?
OTF to WOFF privately in your browser.