TetraKitsBase64 Encoder & Decoder
Encode plain text to Base64 or decode Base64 back to readable text — results update as you type. Paste API tokens, data URIs, or configuration strings and copy the output with one click.
Read: Base64 Encoder & Decoder Guide: Text and Files Online →
- Free to Use
- No Signup
- Privacy Friendly
How to encode or decode Base64
- 1
Choose encode or decode
Select Encode to convert text to Base64. Select Decode to reverse Base64 back to plain text.
- 2
Paste your input
Enter text in the input field. Encoding handles UTF-8 characters; decoding expects valid Base64 padding.
- 3
Copy the result
Use the copy button for output. For URL-safe transport, pair with the URL encoder after encoding.
What is Base64?
Base64 encodes binary data as ASCII text using 64 printable characters (A–Z, a–z, 0–9, +, /). It is used in email attachments, data URLs, JWT tokens, and API payloads.
URL-safe Base64 replaces + with - and / with _ so encoded strings work in URLs without escaping.
Why Use This Tool?
Text & Files
Paste text or upload any file to get Base64 output.
URL-Safe Mode
Switch encoding for JWT and query-string use cases.
Two-Way
Encode to Base64 or decode back to plain text.
Client-Side
All conversion runs locally in your browser.
Frequently Asked Questions
What is Base64 encoding used for?
Base64 represents binary data as ASCII text — common in email attachments, JWT tokens, data URIs, and API payloads that must travel through text-only channels.
Can I decode invalid Base64?
Invalid padding or non-Base64 characters produce an error message. Check for extra spaces or truncated strings.
Is Base64 encryption?
No. Base64 is encoding, not encryption. Anyone can decode it. Do not use it to hide secrets.
Does it support Unicode text?
Yes. Encoding uses UTF-8 before Base64 conversion, so emoji and accented characters encode correctly.
Is this Base64 encoder free?
Yes. Unlimited encode and decode with no signup; all processing runs locally in your browser.
Base64 Without Command-Line Tools
API debugging, JWT inspection, and data URI construction routinely need quick Base64 conversion. A browser encoder handles encode and decode with live output — no terminal, no npm package, no upload.
