To convert SVGs into an icon font online without uploading them, use a browser tool whose documentation explicitly says conversion runs locally. IcoMoon supports local SVG import and font generation; Fontglyph describes local SVG-to-WOFF2 conversion. The no-upload promise has limits: optional hosting, project saving, or CDN publishing can transmit or expose files. These are vendor descriptions, not an independent network audit.
Choose a browser-based converter—and check what “local” means
IcoMoon documents browser-local SVG import and font generation, and says its app can work offline after it has been loaded once. Its files are not uploaded unless you choose hosting or paid-account project auto-saving. Fontglyph describes its SVG/PNG-to-WOFF2 conversion and storage as local by default, but its optional CDN publishing uploads the icon library and makes it reachable to anyone with the link.
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For especially sensitive artwork, load a supported tool first, disconnect from the network, and verify that the needed workflow still works. IcoMoon recommends offline use for privacy concerns. These statements describe the tools’ published behavior; they are not a network-traffic test.
Fontello accepts custom SVGs and exports webfonts, and its repository documents combining and shrinking icon sets. However, it also describes server-backed API configurations and sessions retained for 24 hours. Do not assume every Fontello workflow is upload-free.
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Convert SVGs into an icon font
- Prepare your SVGs. Keep the original files and check that each contains the icon you expect. Import a small sample first if the set uses complex SVG features; some SVG constructs may not import or render as intended.
- Import and inspect the glyphs. In IcoMoon, add your SVG files to the app and review the imported icons. Its current documentation says you do not need to convert strokes to fills or change
fill-rulebefore import. During font generation, however, the app may expand strokes to fills and unite intersecting paths. Compare the result with the source and edit or simplify a file if its appearance changes. - Name glyphs and review codepoints. Give each icon a useful name and check its character mapping before export. IcoMoon assigns Private Use Area codepoints by default, and its editor lets you change them. Keep a record of the mapping so later edits do not silently change which icon a codepoint represents. Ligatures can map words to glyphs, but test them in the browsers and fonts you support.
- Choose only the formats you need. IcoMoon offers font and non-font export options, including SVG and SVG Sprite. Its FAQ says generated font packages include WOFF and TTF; WOFF2 generation is dependent on a paid plan. Fontglyph advertises local WOFF2 conversion. Check the selected product and plan rather than assuming every browser converter includes WOFF2.
- Export and verify the package. Open the generated demo or cheat sheet and check every glyph before using it on a site. Keep the original SVGs and editable project alongside the exported files.
- Test on the target website. Load the font in the site and check its appearance at the sizes and browsers you support. If self-hosted glyphs fail to load, inspect the browser console and check the font’s CORS configuration.
Which tool fits your workflow?
| Tool | Documented fit | Privacy and output distinction |
|---|---|---|
| IcoMoon | Browser-local SVG import and font generation; offers several export types and can work offline after initial loading. | Import and generation are described as local unless you opt into hosting or paid-account auto-saving. Its FAQ says WOFF2 generation depends on a paid plan. |
| Fontglyph | Browser-local SVG or PNG conversion to WOFF2. | Conversion and storage are described as local by default. Optional CDN publishing uploads the library and makes it available to anyone with the link. |
| Fontello | Custom SVG import and webfont export; can combine and shrink icon collections. | Its repository also documents server-backed configurations and sessions, so do not treat every workflow as confirmed upload-free. |
Compare the tools on the factors that affect your project: whether conversion is local, which SVG features import correctly, what formats and plan limits apply, whether codepoint assignments can be kept consistent, and whether the exported package includes a useful preview. The available documentation does not establish a universal best converter or a performance ranking.
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Keep a reversible source project
Retain the original SVG files, the editable project or configuration, the glyph-name-to-codepoint mapping, and license information. This makes it easier to regenerate the font without losing track of which icon each character represents.
Provide meaningful fallback behavior
IcoMoon recommends treating icon fonts as progressive enhancement and supports ligatures that map character sequences to glyphs. Preserve readable text where possible, and make sure an icon-only control communicates its purpose to assistive technology; a decorative glyph alone is not a label.
Check both font and artwork licenses
Keep the generator’s terms separate from the licenses for imported icons. IcoMoon’s FAQ says using its app with your own vectors does not require an app license, while each library pack has its own license and author details. Check the terms for the specific artwork you use, as well as any generated-font requirements that apply to your project.
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