Image Resizer
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Resize images to any width and height. Lock aspect ratio, choose presets, and download instantly. 100% browser-based.
Image to Base64
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Convert any image to a Base64 data URI for embedding directly in HTML, CSS, or JSON. Copy with one click.
Image to Base64
Drop an image here, or click to browse
PNG, JPG, WebP, GIF up to ~20 MB
About This Tool
What is a Base64 Image?
Base64 encoding turns binary image data into a long string of ASCII characters. The result is a “data URI” that you can paste directly into <img src=”…”> or CSS background-image: url(…) without needing a separate file.
When to Use
- Tiny icons embedded in HTML emails or single-file documents
- CSS sprites below ~5 KB to save HTTP requests
- JSON payloads that include image previews
- Self-contained HTML files (offline docs, reports)
When NOT to Use
- Large images – Base64 is ~33% bigger than the binary file and hurts page load.
- Images that should be cached separately by the browser.
- Images that change frequently – cache invalidation becomes harder.
Frequently Asked Questions
Why is the Base64 longer than my original file?
Base64 uses 4 ASCII characters to represent every 3 bytes of binary, giving a fixed ~33% size increase. Plus the data URI prefix adds a few dozen more characters.
Should I Base64 every image on my site?
No - only tiny ones (under ~5 KB). Large Base64 images bloat your HTML/CSS and cannot be cached separately, which slows page loads. For most images, regular img src is faster.
Can I decode Base64 back to an image?
Yes - paste the data URI into a browser address bar to view it. Most online Base64 decoders accept the full data URI.