TOOL · 02
Base64 Encode / Decode
Encode text or images to Base64, or decode them back. Full UTF-8 support — Chinese, emoji, everything.
Converter
Supports PNG, JPG, GIF, WebP and SVG. Recommended size: under 2 MB — Base64 output is about 33% larger than the original file.
Output
About Base64
Base64 is a binary-to-text encoding scheme that represents binary data as an ASCII string. It shows up everywhere: email attachments, data URLs, JWT tokens, API keys. This tool supports full UTF-8.
Features
Full UTF-8
Chinese, emoji, any language — encoded and decoded correctly, byte for byte.
Image support
Convert PNG, JPG, GIF, WebP and SVG files to Base64 data URIs and back.
100% private
Everything runs in your browser — your data never leaves the page.
Free forever
No registration, no limits, no watermarks. Just paste and go.
How to use
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1
Enter or paste
Type text to encode, or paste a Base64 string to decode. In Image mode, pick or drop an image file.
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2
Click Encode or Decode
Encode turns text into Base64; Decode turns Base64 back into readable text.
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3
Copy the result
Grab the output with one click — for images, copy the data URI or the raw Base64.
Use cases
Data URIs
Embed images directly in CSS or HTML as data: URIs — no extra HTTP request.
Email & attachments
Understand and produce the Base64 payloads used by MIME email.
API tokens
Decode JWT segments, API keys and other Base64-encoded credentials.
Binary in text fields
Safely store binary data in JSON, XML or database text columns.
Example
Hello, TmpIO!SGVsbG8sIFRtcElPIQ==Base64 output is about 33% larger than the input — every 3 bytes become 4 characters, with optional = padding at the end.
FAQ
Is my data uploaded to a server?
No. Encoding and decoding happen locally in your browser with plain JavaScript. Nothing is transmitted or stored.
Why is my decoded text garbled?
The source was probably not valid Base64, or it was encoded from binary rather than UTF-8 text. This tool assumes UTF-8 text.
What is the = padding at the end?
Base64 works in 4-character blocks. When the input length is not a multiple of 3, = characters pad the final block.