What this tool is good for
Base64 is a common way to turn binary data into printable text. It shows up in API payloads, email content, Data URLs, config snippets, and logs. This page lets you quickly encode text to Base64 and decode Base64 back to readable content.
It solves a transport compatibility problem, not a security problem, so it is important to separate encoding from encryption.
Typical use cases
- Inspect the original text behind a Base64 field returned by an API.
- Encode plain text before embedding it into a request body or config value.
- Check whether a log field, config snippet, or JWT segment has been Base64-encoded.
- Pair it with URL Encode/Decode and Unicode Encode/Decode when debugging string conversion problems.
How to use it
- Enter the text you want to encode on the left side and the Base64 result updates immediately.
- Paste a Base64 string on the right side to decode it back to text.
- Copy whichever result you need and pass it to the next system.
Example
Original text: hello qr9
Base64: aGVsbG8gcXI5
If you paste aGVsbG8gcXI5 into the decode panel, the tool restores the original text hello qr9.
Common mistakes
- Treating Base64 as encryption leads to the wrong security expectations.
- Some systems use the Base64URL variant, which is not always interchangeable with standard Base64.
- If the original content is binary data such as an image or file, the decoded output may not be readable as plain text.
FAQ
Is Base64 encryption?
No. Base64 is only an encoding format that turns binary or text into printable characters. Anyone can decode it back, so it cannot replace encryption.
Why does the decoded output look garbled?
That usually means the original data was not text in the same character encoding, or the payload is actually binary content such as an image or file.
Why do some strings look like Base64 but still fail to decode?
They may be missing padding, contain invalid characters, or use the Base64URL variant. Check the original source and encoding rules first.
What is the difference between Base64 and Base64URL?
Base64URL replaces characters such as plus and slash with URL-safe alternatives and may omit padding. The rules are similar but not identical.
Related tools
If you need to keep debugging string conversion or payload formatting, these tools are often useful next:
- URL Encode/Decode：Encode and decode special characters in URLs
- Unicode Encode/Decode：Encode and decode Unicode escape sequences online
- Text Encoding Converter：Convert between UTF-8, UTF-16LE, UCS-2, Latin1, Base64, ASCII, hex, and byte arrays