WOFF2 vs TTF Compression Ratio Lookup
Actual same-content encoded file size ratio with possible negative savings, not invented universal compression percent or subset glyph estimate. Explicit caller font/layout/reference context; not a shaping engine, actual page layout or accessibility certification.
Description
Font compression savings need files with the same glyph content and comparable encoding scope.
Font compression savings need files with the same glyph content and comparable encoding scope.1
Comparing their measured byte sizes gives a file-size ratio that can also show negative savings.
When to use WOFF2 vs TTF Compression Ratio Lookup
Use this tool when you need to reproduce the stated calculation from measured records or independently selected model inputs. Establish the font version, feature, layout, physical or CSS units, and matched reference basis needed for this calculation.
How to use WOFF2 vs TTF Compression Ratio Lookup and understand its results
- Establish the font version, feature, layout, physical or CSS units, and matched reference basis needed for this calculation.
- Enter observedMatchedTtfBytes, observedMatchedWoff2Bytes, independentlySameGlyphContentVerified, following the field table and rules below, then run the tool.
- Read observedWoff2ToTtfRatio, observedSavingsPercent. Use the output meanings below to interpret units, signs, flags, and any nested result fields.
- Correct reported input issues and run again. For a successful result, check the stated evidence coverage and assumptions before using it in your review.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedMatchedTtfBytes | Observed matched TTF bytes | number | Required |
| observedMatchedWoff2Bytes | Observed matched WOFF2 bytes | number | Required |
| independentlySameGlyphContentVerified | Independently same glyph content verified | boolean | Required |
Use a positive integer TTF byte count, a nonnegative integer WOFF2 byte count, and true for independently verified same content. Divide WOFF2 by TTF; subtract the ratio from one and multiply by 100. This tool does not compress or inspect a font file.
ratio=WOFF2bytes/TTFbytes; savingsPercent=100(1−ratio) Symbols follow the input and output meanings and the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| observedWoff2ToTtfRatio | Observed WOFF2 to TTF ratio | number |
| observedSavingsPercent | Observed savings percent | number |
{
"input": {
"observedMatchedTtfBytes": 1000,
"observedMatchedWoff2Bytes": 400,
"independentlySameGlyphContentVerified": true
},
"output": {
"observedWoff2ToTtfRatio": 0.4,
"observedSavingsPercent": 60
}
}Limitations and assumptions
The calculation uses declared units and font or layout assumptions. It does not shape glyphs, lay out actual pages, or certify accessibility or print quality.
Missing required fields, unknown fields, wrong types, and violated calculation rules are input issues. Numeric values must be finite; nonfinite results are rejected.
Alternative or Complementary methods
For a related review, use Common Font Ligature Count Lookup: A ligature inventory is specific to a font version and selected features. Comparing an observed count with a keyed reference avoids assuming that common font names imply fixed counts. For a complementary step, use Average Kerning Pairs Per Font Lookup: Kerning inventory counts depend on font version and table representation. A keyed reference comparison can audit the declared count without treating class-based GPOS kerning as a simple universal pair list.
References
-
WOFF2 vs TTF Compression Ratio Lookup — tool.io
Similar or alternative tools
- Common Font Ligature Count Lookup
A ligature inventory is specific to a font version and selected features. Comparing an observed count with a keyed reference avoids assuming that common font names imply fixed counts.
- Average Kerning Pairs Per Font Lookup
Kerning inventory counts depend on font version and table representation. A keyed reference comparison can audit the declared count without treating class-based GPOS kerning as a simple universal pair list.