Encode text or images to Base64, or decode Base64 back to text or an image. It all runs in your browser, so nothing is uploaded.
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- Choose the Text or Image tab.
- For text, pick Encode or Decode, enter your input and click Convert.
- For images, upload a file to get its data URI, or paste a Base64 string and click Preview Image.
- Copy the result, or download the decoded image.
What Is Base64 Encoding?
Base64 turns text or binary data, such as an image, into a string of letters, numbers, + and /. Websites use it for data URIs, email attachments and binary data inside JSON or XML.
- It is not encryption. Anyone can decode it.
- It makes data about 33% larger, because 3 bytes become 4 characters.
- Data URIs such as
data:image/png;base64,...embed small images directly in HTML or CSS.
Common Uses for Marketers and Developers
- Embed a small logo in email HTML.
- Read API responses that return files as Base64 in JSON.
- Check the contents of webhook payloads.
- See which image a data URI from browser dev tools contains.
Frequently asked questions
Is Base64 the same as encryption?
No. It is an encoding, so anyone can decode it. Use proper encryption such as AES to protect sensitive data.
Why is my Base64 output longer than my text?
Base64 turns every 3 bytes into 4 characters, so the output is about 33% larger.
Can I use an encoded image in CSS or HTML?
Yes. Copy the data URI from the Image tab and use it as a CSS background-image: url(...) value or an <img src="..."> attribute.
Why did decoding fail?
The string is probably cut short or contains characters outside A to Z, a to z, 0 to 9, +, / and =. Copy the whole string with no extra characters.
Does this tool upload my files?
No. Everything runs in your browser and nothing is sent to a server. It is free and needs no account.
Sources
- IETF, “RFC 4648: The Base16, Base32, and Base64 Data Encodings“, accessed September 2026.
Related free tools
- URL Encoder & Decoder: Encode or decode URLs and query strings.
- Image Compressor: Make images smaller before you embed them.
- Free QR Code Generator: Create QR codes and download a PNG.
- See all free tools for marketers