Base64 Encoder / Decoder troubleshooting: errors, compatibility, and fixes
Diagnose unexpected Base64 Encoder / Decoder results by checking input, format, browser behavior, and output in order.
Preserve the source first
Never overwrite the original text or image while diagnosing a problem. Work from a small copy and note the input format, browser, and action you ran. Base64 Encoder / Decoder is useful for API parameters, Basic Auth debugging, and text transport, while production material should still be checked in its source system.
Recommended troubleshooting order
- Test the tool with the practical example or a smaller input.
- Confirm the input is supported and remove accidental invisible characters.
- Work through the checklist below.
- Refresh the page or retry in a current Chrome, Edge, or Safari release.
- If the result is still wrong, keep the source safe and use the specialist application that created it.
Input and result checks
- Both sides use UTF-8
- Trailing
=padding is not accidentally removed - Base64 is encoding, not encryption
Two common problems
Why is decoded text garbled?
Make sure both the encoder and decoder use UTF-8.
What causes an invalid-character error?
The input may contain whitespace, URL-safe Base64 characters, or incomplete padding.
Why these limits exist
- This version processes text rather than arbitrary binary files.
- Base64 adds overhead and is usually about one third larger than the source bytes.
A browser tool is fast, installation-free, and can process content locally, but it does not replace a full editor, specialist validator, or server-side batch system.
Security and privacy
Processing runs in the current browser. Do not paste secrets, customer data, or confidential material on an untrusted device, and clear the clipboard and downloads after using a shared computer.