Developer Utilities

Calculate the exact encoded Base64 length for any input size, including padding.

Estimate the decoded byte size of a Base64 string from its length and padding.

Benchmark how fast your browser encodes and decodes Base64 of varying sizes.

Count characters, bytes, words, and lines, with a live Base64-validity check.

Wrap a long Base64 string to fixed-width lines (MIME 76, PEM 64, or custom).

Collapse a wrapped Base64 string back into a single continuous line.

Convert between standard and URL-safe alphabets and fix or strip padding.

Remove spaces, tabs, and newlines from a string to get a clean, compact payload.

Break a data URI into its scheme, MIME type, charset, encoding flag, and payload.