Base64 Encoder & Decoder Online
Use this free online Base64 Encoder & Decoder tool to encode text to Base64 or decode Base64 strings back to readable text. Processes instantly as you type.
How it works & FAQ
Why this is secure?
Base64 encoding and decoding run entirely in your browser. Your text and files are never uploaded or transmitted to any server.
Step-by-Step Guide
- 1Paste text into the input field, or upload a file you want to encode.
- 2Click 'Encode' to convert to Base64, or 'Decode' to convert Base64 back to plain text.
- 3Copy the result using the copy button.
Frequently Asked Questions (FAQ)
What is Base64 used for?
Base64 safely represents binary data as ASCII text — common in email attachments, embedding images in HTML/CSS, API payloads, and JWT tokens.
Can I encode an entire file to Base64?
Yes. Upload a file and it will be encoded as a Base64 string. Note that Base64 output is ~33% larger than the original file.
Why does my decoded Base64 look garbled?
Base64 can encode any binary data. If the original was an image or binary file, the decoded output won't be readable as plain text.
All encoding and decoding happens in your browser. Your data never leaves your device.