Font Compatibility Checker
Check if a font supports all characters in your Bangla text.
How to Check Font Compatibility
- 1
Enter text
Paste or type your Bangla text into the input box.
- 2
Select font
Enter a font name or pick from the quick-select list of common Bangla fonts.
- 3
View results
The checker shows which characters are supported and which are missing.
- 4
Review missing
Missing characters are listed with their Unicode code points for debugging.
- 1
Enter text
Paste or type your Bangla text into the input box.
- 2
Select font
Enter a font name or pick from the quick-select list of common Bangla fonts.
- 3
View results
The checker shows which characters are supported and which are missing.
- 4
Review missing
Missing characters are listed with their Unicode code points for debugging.
Font Compatibility Checker Features
When You Need a Font Compatibility Checker
Web Design
Verify that your chosen web font supports all Bangla characters before deploying to production.
Print Publishing
Check if a font has complete Bangla character coverage for print and DTP workflows.
Font Selection
Compare different fonts to find the one with the best Bangla character coverage for your project.
Debugging Display Issues
Identify which characters are missing from a font when text displays incorrectly.
Understanding Font Compatibility Results
This checker uses the Canvas API to detect whether a font can render each character in your text. It renders each character using the target font and measures the output. If the rendered width matches the fallback font (indicating the character was not found in the target font), it is flagged as missing.
Missing characters are displayed as boxes (tofu) and listed with their Unicode code points so you can identify exactly which characters the font lacks. This is especially useful for Bangla, where complex conjuncts (যুক্তাক্ষর) are often missing from less complete fonts. Noto Sans Bengali has the widest coverage and is recommended for production use.
Common Font Compatibility Problems & Fixes
| Problem | Cause | Fix |
|---|---|---|
| All characters show as missing | The selected font is not installed on your system, so the browser cannot render any characters with it. | Install the font first, or select a font from the quick-select list that you know is installed. Noto Sans Bengali is a safe default if installed. |
| Only conjuncts (যুক্তাক্ষর) show as missing | The font covers basic characters but lacks glyphs for complex conjuncts or rare combinations. | Use Noto Sans Bengali which has the widest conjunct coverage, or manually replace missing conjuncts with their component characters. |
| Checker says all characters are supported but some display incorrectly | The Canvas API detects glyph presence but cannot verify visual correctness — a font may have a placeholder or incorrect glyph for a code point. | Visually inspect the rendered text in the live preview. If a character looks wrong despite being marked as supported, the font may have a broken or placeholder glyph. Try a different font. |
| Results differ between browsers | Different browsers may use different font rendering engines and fallback fonts, affecting Canvas measurements. | For consistent results, use the same browser for all compatibility checks. Chrome and Firefox tend to produce the most reliable font detection results. |
Frequently Asked Questions
How does the font compatibility checker work?
The checker uses the Canvas API to measure character widths. Characters that render as zero-width boxes (tofu) are flagged as missing. This is a best-effort heuristic — actual rendering depends on your system's font configuration.
Which fonts should I check?
Common Bangla fonts include Noto Sans Bengali (recommended), SolaimanLipi, Siyam Rupali, Kalpurush, SutonnyMJ (Bijoy), and Lohit Bengali. You can enter any font name installed on your system.
Why do some characters show as boxes?
Boxes (sometimes called "tofu") appear when a font does not include the glyph for a character. This means the font lacks coverage for that specific Bangla character or conjunct.
Can I check fonts that are not installed?
No. The checker can only test fonts that are installed on your system. If a font is not installed, all characters will appear as missing because the browser falls back to a default font.
Which font has the best Bangla coverage?
Noto Sans Bengali by Google has the most complete coverage of the Bengali Unicode block, including rare conjuncts and historical characters. It is free and available on Google Fonts. For legacy Bijoy text, SutonnyMJ is the standard but only works with Bijoy-encoded text, not Unicode.
Can I check web fonts (Google Fonts) before installing?
This tool checks system-installed fonts only. To test a Google Font, first load it in your browser via a CSS @font-face or link tag on a separate page, then come back to this tool — the font will be available for checking once the browser has loaded it.
Is this Font Compatibility Checker free?
Yes, completely free. No registration, no daily limit, no character cap. All checking happens in your browser — there is no server-side processing. You can use it unlimited times for personal, educational, or commercial work.
How accurate is the Canvas API detection method?
The Canvas API method is a heuristic — it compares the rendered width of text in the target font against a fallback font. If widths match, the character is likely missing. This method is highly accurate for common cases but may produce false positives for characters that happen to have the same width in both fonts. For production-critical use, manually verify flagged characters.