Free Base64 Encoder & Decoder
A free Base64 encoder converts text to Base64 and back instantly in your browser. Paste input, choose encode or decode, and copy the result — no signup, no server upload.
Encode plain text to Base64 or decode Base64 strings back to readable text. Handles UTF-8 characters correctly. Useful for API tokens, data URIs, and debugging. Runs locally — free, no signup.
Runs 100% in your browser. Your data never leaves your device.
Built with TextEncoder, TextDecoder, and btoa/atob with UTF-8 handling — standard browser APIs, no third-party libraries.
How to Use Base64 Encode / Decode
- Choose Encode or Decode — output updates as you type
- Paste or type in the input box
- Copy the result from the output area
When Would You Use This?
Developers inspecting JWT payloads decode the middle Base64 segment to read claims without installing CLI tools.
Email marketers debugging MIME attachments verify Base64-encoded HTML blocks before sending campaigns.
Anyone pasting emoji or non-ASCII text into Base64 learns quickly that proper UTF-8 encoding matters — this tool handles that correctly.
Frequently Asked Questions
- Is this Base64 tool free to use?
- Yes, completely free. No signup, no login, no payment ever.
- Do I need to create an account?
- No account needed. Open the tool and start using it immediately.
- Is my data safe?
- Everything runs in your browser. Nothing is uploaded to our servers. We cannot see your data.
- Why does decoding fail?
- Invalid Base64 input — wrong characters, missing padding, or corrupted data — will show an error. Check the string is complete and uses valid Base64 characters.