What is Base64?
Base64 is an encoding method that converts binary data into plain text characters. Developers use it when data must travel through systems that expect text, such as JSON payloads, HTML attributes, CSS files, and email formats. Base64 is not encryption; it simply represents data in a different form.
Common Base64 uses
- Embedding small images as data URIs in HTML or CSS.
- Encoding API tokens or payload parts for transport.
- Decoding sample strings during debugging.
- Testing webhooks, JSON fields, and developer documentation examples.
How to encode and decode Base64 online
- Use Base64 Encode to convert text into a Base64 string.
- Use Base64 Decode to convert a Base64 string back into readable text.
- Copy the output and test it in your app, API, or content workflow.
Image to Base64 data URIs
Small icons, logos, or placeholder images can be converted into Base64 data URIs and embedded directly in code. This can reduce extra HTTP requests, but it is not ideal for large images because Base64 strings can be heavier than the original file. For large images, optimize with Image Compressor instead.
Security notes
Because Base64 is reversible, never treat it as a way to hide passwords or secrets. Anyone can decode a Base64 string. For sensitive content, use proper encryption and secure storage, not simple encoding.
Frequently Asked Questions
Read answers to the most common questions about this format and conversion process:
No. Base64 is encoding, not encryption. It is reversible and should not be used to protect secrets.
Yes. Use the Image to Base64 tool to create a data URI for small images or icons.
Base64 commonly increases size because binary data is represented with text characters.
Yes. Browser-based decoding is useful for development because the conversion can happen locally on your device.