Base64 Encode / Decode
Encode UTF-8 text as Base64 or decode Base64 back to readable text.
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When to use base64 encode / decode
- Prepare small encoded text values.
- Inspect UTF-8 data carried in an encoded field.
How it works
UTF-8 bytes are grouped into Base64 characters. Base64URL replaces + and / with - and _, and removes padding when encoding.
Supported inputs and limits
UTF-8 text only, up to 2 MiB. Binary files are not decoded as text. Base64 is reversible encoding and provides no confidentiality.
Common questions
Is Base64 encryption?
No. Anyone with the string can decode it.
Can this decode an image file?
This tool is for UTF-8 text. Arbitrary binary output is rejected instead of displaying replacement characters.
Methodology reviewed 2026-09-09. Processing details and test approach.