Encode and decode Base64

Convert text or images to Base64 and decode them when needed. Choose the input type, check the result, then copy or download it.

Choose data and a Base64 action

Input 0 characters
Result 0 characters
Ready to encode UTF-8 text

Choose or drop an image

PNG, JPG, GIF, WebP, SVG · up to 5 MB

Base64 Data URL
Image processing runs in your browser

Use Base64 in 3 steps

01

Text or image

Choose Text to encode UTF-8 or decode Base64 into text. Choose Image to create a Data URL from a file or restore an image from Base64.

Choose the right mode

InputActionCheck the result
Vietnamese or other Unicode textText → EncodeA Base64 string; use URL-safe if the destination requires it.
Base64 string to read as textText → DecodeUTF-8 text; binary data can produce an error.
Image file or Data URLImage → Encode or DecodeData URL or preview; 5 MB file input and 8 MB decoded output limits.

If the result looks wrong

Text decoding fails
Check the Base64 string for missing or extra characters; decoded bytes must also be UTF-8. For an image, switch to Image mode.
No image preview
Use actual PNG, JPG, GIF, WebP or SVG bytes. A Data URL with the wrong image type or unrecognized bytes is rejected.
Base64 is longer than the file
Base64 is a text representation, not compression. If embedding is unnecessary, use the original image file to avoid extra size.

Data and limits

Input is converted in your browser and is not uploaded to an KitoTool server for this conversion. Base64 can be decoded; do not use it to hide passwords, keys or sensitive data. Anyone receiving a Data URL can recover the full image.

Comments & feedback

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  <iframe data-kitotool-embed src="https://kitotool.com/embed/en/base64-encoder-decoder/" title="Base64 Encoder Decoder — KitoTool" width="100%" height="1100" style="display:block;width:100%;border:1px solid #dbe3ee;border-radius:12px" loading="lazy" referrerpolicy="strict-origin-when-cross-origin"></iframe>
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