The Font Preview and Test tool is a quick way to see exactly how a typeface looks before you install it or embed it in a project. You upload a font file, type or paste the text you want to check, and the tool renders it live across several specimen panels - a main preview, the full alphabet in upper and lower case, digits, symbols, and a waterfall of sizes.

Because rendering happens with the browser's FontFace API, the font never leaves your computer. There is no server, no account, and nothing to install. It is ideal for designers reviewing a typeface, developers confirming how a self-hosted font will render, and anyone checking contrast before committing to a color scheme.

A font tester is a tool that lets you preview how a typeface looks before you use it in a design or on a website. Instead of installing the font on your operating system or embedding it in a project, you load it directly in the browser and see exactly how letters, numbers and symbols are rendered. This is especially useful for evaluating custom or unfamiliar fonts, because the real character of a typeface – its proportions, weight, spacing and rhythm – can only be judged in context with actual text.

Modern browsers expose the FontFace API, which makes it possible to register a font from a local file and apply it to any element on the page without uploading anything to a server. All rendering happens locally, so the font file never leaves your device. The Font Preview and Test tool builds on this to give you a full specimen view in seconds.

This Font Preview and Test tool lets you upload a font file (TTF, OTF, WOFF or WOFF2) and instantly preview it with fully customizable typography settings. You can adjust the font size, line height, letter spacing, word spacing, weight, style, alignment and colors, then see the result rendered live across multiple specimens – sample text, the full alphabet, digits, symbols and a size scale – to evaluate the typeface from every angle.

When you are happy with the result you can export the preview as a PNG image to share or drop into a design document, or download the original font file you uploaded. A contrast warning tells you when your text and background colors fall below the 4.5:1 ratio recommended for readable text. Every change updates the preview immediately, and a single click restores all controls to their defaults.

Example 1: Default preview

Load the page and the three-line sample below already appears in the preview panels using your system font. Upload any .ttf or .woff2 file and the same panels instantly re-render in your typeface:

The quick brown fox jumps over the lazy dog.
THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.
0123456789

Example 2: Dark background check

Set the background color to #111111 and the text color to #f5f5f5. The tool reports the contrast ratio and, because the combination is well above 4.5:1, shows a neutral "Preview ready" message. Drop the text to #888888 and a red warning appears telling you the contrast is too low to read comfortably.

Example 3: Weight and spacing test

Change the font weight to 700, set letter spacing to 2px, and watch the uppercase and size-scale panels update so you can judge how a bold, slightly tracked headline will look.

• TTF (TrueType Font): widely supported outline fonts.
• OTF (OpenType Font): supports advanced typographic features.
• WOFF (Web Open Font Format): compressed, web-optimized fonts.
• WOFF2 (Web Open Font Format 2.0): the format most websites use today, with stronger compression.

All processing happens locally in your browser, so the font file never leaves your device. If your browser cannot decode a particular file, the tool shows an error message instead of failing silently.

• Sample text: the text shown in the main preview and the size-scale waterfall; supports multiple lines.
• Font size: size of the main preview text in pixels (8–200). The alphabet, digit and symbol panels render at the same size.
• Line height: vertical spacing between lines, as a percentage of the font size (50–300%).
• Letter spacing: extra space between individual characters, in pixels (-10 to 30). Negative values tighten the text.
• Word spacing: extra space between words, in pixels (-10 to 50).
• Font weight: numeric weight from 100 (Thin) to 900 (Black). Only weights actually included in the font file render distinctly; others are simulated by the browser.
• Text alignment: left, center, right or justified alignment of the preview text.
• Italic: toggles font-style: italic. If the font has no italic variant, the browser may synthesize a slanted version.
• Text color & Background color: the foreground and background used for every panel; they also drive the contrast check.
• Reset to defaults: restores the sample text and every control to its original value.

• Some fonts only ship a single weight; switching to bold or thin may look identical or fall back to a synthetic browser style. Check the font's documentation if a weight looks wrong.
• Use the size-scale panel to spot fonts that hint poorly at small sizes – a typeface that looks elegant at 64px can become unreadable at 12px.
• Test your font against both light and dark backgrounds; thin weights often disappear on dark backgrounds and need to be bumped up.
• Compare the uppercase and lowercase panels side by side to evaluate x-height, cap height and overall rhythm.
• Export a PNG after setting a dark background to create quick mockups for client reviews.

• Variable-font axes beyond standard weight and italic are not exposed individually.
• OpenType features such as ligatures, stylistic alternates and small caps are rendered using the browser's defaults and cannot be toggled in the UI.
• Very large font files may take a moment to load and parse.
• The exported PNG captures the main preview sample text together with the uppercase alphabet, lowercase alphabet, digits and symbols specimens (using the current font, size, color and weight). It does not include the size-scale waterfall.

• Designers reviewing a typeface before buying or installing it.
• Web developers confirming how a self-hosted font will render before writing CSS.
• Content teams checking that branding fonts include the numerals and symbols they use.
• Accessibility reviewers verifying text/background contrast in a proposed color scheme.
• Anyone wanting a quick PNG mockup of a headline in a specific font.

FAQ 1: Is my font file uploaded to a server?
Answer: No. The file is read and rendered entirely in your browser. It is never sent anywhere.

FAQ 2: Why does my font not load?
Answer: The file may be corrupt, password-protected, or in an unsupported format. Check that it is a .ttf, .otf, .woff or .woff2 file and try again.

FAQ 3: Can I preview more than one font at once?
Answer: You can load a new file at any time; it replaces the previously loaded font across all panels.

FAQ 4: What does the contrast warning mean?
Answer: It means the text and background colors fall below the 4.5:1 ratio recommended for readable text. Choose colors with more separation.

FAQ 5: Does the exported PNG include all the panels?
Answer: The PNG export captures the main preview sample text plus the uppercase alphabet, lowercase alphabet, digits and symbols specimens, at the current size, spacing, color and weight settings. The size-scale waterfall is not included.

FAQ 6: Can I download the font I uploaded?
Answer: Yes, the "Download font" link saves the exact file you selected back to your device.