Line Wrap Tool

The Line Wrap Tool wraps a long Base64 string to fixed-width lines, with MIME (76), PEM (64), or custom widths. It is for developers formatting Base64 for standards that require wrapped lines.

Some formats, like PEM and MIME, expect Base64 wrapped at a set width. Wrapping it locally produces compliant output instantly and privately.

1. Paste a long, single-line Base64 string.
2. Choose a line width: MIME (76), PEM (64), or custom.
3. The string is wrapped to that width.
4. Copy the wrapped result.

• MIME, PEM, and custom line widths
• Wraps long Base64 cleanly
• Instant output
• Runs locally — Line Wrap

• Formatting Base64 for a PEM certificate or key
• Wrapping data for a MIME-encoded email part
• Meeting a format that requires fixed-width lines
• Making a long string easier to read

• Use 64 for PEM and 76 for MIME, matching each standard exactly.
• Unwrap the string again if a system expects a single continuous line.
• Avoid adding trailing whitespace, which can break strict parsers.

• Wrapping to the wrong width for the target standard, such as using 76 where PEM needs 64.
• Leaving the string wrapped where a system expects one continuous line.
• Introducing trailing spaces that some parsers reject.