Data URI Size Estimator

Estimate the byte size and overhead of a Base64 data URI for a given raw file size before embedding it.

Raw payload size

Unit

MIME type

Estimate

Raw payload12,288 B (12.00 KB)

Base64 body length16,384 B

Prefix length22 B ("data:image/png;base64,")

Total data URI length16,406 B (16.02 KB)

Encoding overhead4,118 B (+33.5%)

gzip-rough estimate~12.50 KB (text gzips ~20-25%; binary already-compressed barely shrinks)

ceil(raw/3)*4 base64 bodyoverhead ≈ +33%

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