What is Base64 Encoder/Decoder?
Base64 turns binary data into plain-text characters you can safely paste into emails, URLs, config files, and more. Drop in text or an image and get the Base64 output instantly — or paste Base64 and decode it back. Everything runs in your browser, so nothing gets uploaded. Handy for API debugging, embedding images in CSS, or figuring out what a Base64 string actually says.
▶Use Cases5 scenarios
- ◆Sending binary data through text-only APIs
- ◆Embedding images directly in HTML or CSS
- ◆Encoding email attachments the MIME way
- ◆Storing small files inside config files
- ◆Passing data safely through URL parameters
▶How to Use4 steps
- 1Pick encode or decode
- 2Paste your text or drop an image
- 3Watch the result appear instantly
- 4Hit copy — done
▶Features8 features
- ✓Free
- ✓No account needed
- ✓Runs in your browser
- ✓One-click copy
- ✓Instant conversion
- ✓Text and images
- ✓Nothing uploaded
- ✓Works everywhere
▶FAQ7 questions
What is Base64 Encoder/Decoder?
An online Encode and decode Base64 right in your browser. Paste text or drop an image, get your result instantly, and copy it with one click.. Everything runs locally in your browser — no uploads.
What is a Base64 encoder?
A Base64 encoder converts binary data into ASCII text using 64 printable characters (A-Z, a-z, 0-9, +, /). Input: binary data or text. Output: Base64-encoded string. Used for embedding images in HTML/CSS, transmitting data in URLs, and encoding credentials in HTTP headers.
Is Base64 encryption?
No — it is encoding, not encryption. Anyone can decode a Base64 string. If you need actual security, use HTTPS or encrypt the data first.
Why does the output look bigger?
Base64 inflates the size by about 33% because every 3 bytes become 4 characters. That is the trade-off for making binary safe to transmit as text.
Does my data go anywhere?
Nope. Everything happens in your browser. Nothing is uploaded.
What input formats are supported?
Plain text, image files (JPG, PNG, WebP, up to 10MB), and any binary data. Output is standard Base64 string.
Can I decode Base64 too?
Yes. The tool supports both encoding (text/image to Base64) and decoding (Base64 to original data). Processing time < 1 second.