Common Issues We Fix
- ✓Missing or incorrect padding (=)
- ✓Invalid characters (non-Base64)
- ✓Whitespace and newlines
- ✓URL-safe to standard conversion
- ✓Data URL prefix handling
- ✓Truncated strings
How to Repair Base64 Strings
- 1Paste your malformed Base64 string into the input field.
- 2The tool automatically detects and repairs common issues.
- 3Review the repairs made and the repaired output.
- 4Copy the corrected Base64 string or download the result.
Common Use Cases
Fix Missing Padding
Automatically add missing = or == padding characters to invalid Base64 strings.
Remove Invalid Characters
Strip whitespace, newlines, and other invalid characters from Base64 data.
URL-Safe Conversion
Convert between standard and URL-safe Base64 formats (+ / vs - _).
Data URL Handling
Extract and repair Base64 data from data URLs with MIME type prefixes.
Frequently Asked Questions
What types of Base64 errors can this tool fix?
This tool can fix missing padding, remove whitespace and invalid characters, convert between standard and URL-safe formats, handle data URL prefixes, and attempt to repair truncated strings.
How does automatic repair work?
The tool analyzes the string to identify common issues like missing padding, invalid characters, or format inconsistencies, then applies appropriate fixes in the correct order.
Can it repair severely corrupted data?
While it can fix many common issues, severely corrupted or incomplete data may not be fully recoverable. The tool will attempt repairs but cannot restore missing data.
Is the repair process safe?
Yes, all repairs happen locally in your browser. Your data is never sent to any server, and you can review all changes before using the repaired output.