Introduction
The Base64 Encoder converts plain text into Base64 for APIs, fixtures, logs, and transport-safe payloads. Base64 appears in JSON fields, headers, and data URLs—it represents bytes as ASCII text, but it is not encryption; anyone can decode it. Use this page when you need a fast encode workflow without installing a CLI. For inspecting JWT claims, prefer the JWT Decoder. For reversing strings, use the Base64 Decoder. Trim whitespace when copying from chat or email, and confirm whether your system expects standard Base64 or Base64url with correct padding.
Explore more in Tools, All Tools, or the Encoding Tools category.
How to use
- Paste the plain text you want to encode.
- Run encode to produce a Base64 string.
- Verify padding characters if your downstream system is strict.
- Copy the output into your API payload, test fixture, or script.
- If decoding fails later, trim whitespace and confirm Base64 vs Base64url expectations.
Use cases
- Create Base64 strings for unit tests and mocked API responses
- Prepare payloads for systems that require Base64-wrapped text
- Debug integrations where logs show encoded segments
- Generate content for data URL experiments when paired with other tools
- Share repro steps with teammates using consistent encoded samples
FAQ
- Is Base64 the same as encryption?
- No. Base64 is reversible encoding. It does not protect secrets.
- Why does output end with "="?
- Padding makes the encoded length a multiple of four characters.
- Base64 vs Base64url?
- JWT segments often use Base64url (different alphabet). Use the right decoder for your format.
- Can I encode binary files here?
- This tool focuses on text workflows; for images, try Image to Base64 for file-based flows.
- Is my data safe?
- Avoid pasting secrets into any third-party site. Follow your company policy for sensitive data.