Repair Malformed Base64

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Repair Base64 strings by removing whitespace, stripping data URL wrappers, converting Base64URL characters, and restoring padding.

Last updated: May 18, 2026•Author: Mateo Díaz•Reviewed by: Riley Williams

In-browser

Clean and repair common Base64 copy/paste problems

Input

Characters: 17Words: 3Sentences: 0Lines: 1

Options

Output

Characters: 0Words: 0Sentences: 0Lines: 0

What is Base64 repair?

Base64 repair fixes common copy/paste problems: line breaks, spaces, data URL wrappers, URL-safe characters, and missing padding. It cannot restore content that was never copied.

How to use it

Paste the malformed Base64.
Choose repaired output only or a report.
Validate or decode the repaired value.

Example

Input: SGVs bG8td29y bGQ

Output: SGVsbG8td29ybGQ=

Common mistakes

Repair is not magic. Truncated data remains incomplete.
Invalid characters may indicate the value is not Base64.
If the repaired value decodes to binary, use a file or hex decoder.

Related tools

Check the repaired value with the Base64 validator.
Normalize format with Base64 normalize.
Decode text with Base64 to text.

Privacy and security

Repair runs locally in your browser.

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