How Image to Base64 Converter Works
Image → Base64 reads the file's raw bytes and represents them as a Base64-encoded data: URL, which browsers can display directly without a separate image file. Base64 → Image reverses this, turning the string back into image bytes you can preview and download.
How to Use This Tool
- Choose Image → Base64 or Base64 → Image.
- Upload an image (to encode) or paste a Base64 string / data URL (to decode).
- Copy the resulting text, or preview and download the decoded image.
Example
A small PNG icon might encode to a data URL starting with data:image/png;base64,iVBORw0KGgo... — pasting that whole string directly as a CSS background-image or an <img src> displays the image with no separate file request.
Helpful Tips
- Embedding images as Base64 avoids an extra network request, but makes the surrounding file (CSS/HTML/JSON) noticeably larger — it's best for small icons, not large photos.
- If you paste just the raw Base64 characters (no
data:image/...;base64,prefix) into decode mode, the tool assumes PNG by default.
Frequently Asked Questions
Is my image or Base64 string uploaded anywhere?
No, both directions of the conversion happen entirely in your browser.
Why did decoding fail?
The input needs to be valid Base64 (optionally with a data: URL prefix) — text with invalid characters or an incorrect length will show an error instead of a broken image.
What image formats are supported?
Encoding accepts any image your browser can open (JPG, PNG, WebP, GIF, etc.); decoding preserves whatever format was originally encoded.
This tool runs entirely in your browser. Your input is not uploaded to any server.