Base64 Encoder/Decoder

Encode and decode Base64 for text, files, and images — instant and private

🔒 Files never leave your browser
Mode
Text Input 0 chars
Base64 Output 0 chars
Recent Conversions

No conversions yet.

How to Use Base64 Encoder/Decoder

Choose your mode

Select Text, File, or Image Preview mode. Pick encode or decode direction.

Provide input

Type text, upload a file, or paste Base64 data. Conversion happens instantly.

Copy or download

Copy the result to clipboard or download as a file.

Why Choose AllTools Base64 Encoder/Decoder?

  • ✓ 100% free, no account needed
  • ✓ Data never leaves your browser
  • ✓ Text ↔ Base64 with live conversion
  • ✓ File ↔ Base64 for any file type
  • ✓ Image Base64 preview with dimensions
  • ✓ URL-safe Base64 mode
  • ✓ Data URI prefix toggle
  • ✓ Line break formatting (76 chars)
  • ✓ UTF-8 encoding support
  • ✓ Swap, paste, copy, and download actions

Frequently Asked Questions

What is Base64 encoding? ▼
Base64 is a binary-to-text encoding scheme that converts binary data into ASCII characters. It is commonly used to embed images in HTML/CSS and transmit binary data in text-based protocols.
Is this Base64 tool free? ▼
Yes, completely free. No account, no subscription, no hidden fees.
Does my data get uploaded? ▼
No. All encoding and decoding happens directly in your browser using JavaScript. Your data never leaves your device.
What is URL-safe Base64? ▼
URL-safe Base64 replaces + with -, / with _, and removes trailing = padding. This makes the output safe to use in URLs without additional encoding.
Can I encode files to Base64? ▼
Yes. Switch to File mode and upload any file. The tool converts it to a Base64 string that you can copy or download.
Can I preview Base64 images? ▼
Yes. Switch to Image Preview mode and paste a Base64-encoded image string to see it rendered with dimensions and download option.
What is a data URI? ▼
A data URI (data:mime;base64,...) is a way to embed file data directly in HTML, CSS, or JavaScript instead of linking to an external file.
Does it support UTF-8? ▼
Yes. The tool properly handles UTF-8 text including emoji and non-ASCII characters.
Does this work on mobile? ▼
Yes, all AllTools tools are mobile-optimized and work on iOS and Android browsers.

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