Base64 Tools — Encode and Decode
Convert text or images to Base64 and decode Base64 in the browser.
Benefits of UtiliApp
- ✓100% free
- ✓Works in the browser
- ✓Not registered
- ✓Deleted files
How to use
-
1.
Encode text
Enter text and click Convert
-
2.
Encode image
Send an image to obtain Base64.
-
3.
Decode
Paste Base64 to view the original content.
Frequently Asked Questions
Are the data sent?
No. Everything is processed only in your browser.
The conversions occur locally in your browser. No data is sent.
Base64 is a way to represent binary data (such as images or files) using only text characters. It is useful for transporting content in JSON, URLs, CSS/HTML (Data URI), or in contexts where sending binaries directly is not feasible.
When to use Base64
- Embed small icons directly into HTML/CSS with a Data URI to reduce requests.
- Send binary data in APIs that only accept text (e.g., JSON).
- Create prototypes or quick tests without relying on file hosting.
When to avoid
- Large images: the Base64 representation tends to be ~33% larger than the original file.
- Resources that could benefit from browser/CDN caching as static files.
- Sensitive content: Base64 is not encryption; it's only encoding.
Usage tips
- For Data URI, use the format:
data:mime;base64,data. - Optimize the image first (e.g.: WebP) to significantly reduce the size of the generated Base64.
- Ensure the correct MIME type (image/png, image/jpeg, image/webp) when embedding in HTML/CSS or when decoding.
- In emails (MIME), prefer attachments with the appropriate header rather than pasting huge Data URIs into the body.
Limits and compatibility
Modern browsers support long Data URIs, but large content can affect performance and memory. For a better experience, keep embedded assets below ~1–2 MB and use external files when possible.