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Image to Base64 Converter
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Convert JPG, PNG, and other image files to Base64 strings online. Generate Data URLs instantly for web development and data embedding.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Use the image-to-Base64 mode to choose one image file and produce a text result with a media-type prefix, such as data:image/png;base64,. In the Base64-to-image mode, paste either a complete image data URL or encoded text. When the text has no prefix, the page tries to display it as PNG. A successful preview can show image dimensions, an estimated size, and a media type, and the decoded image can be downloaded.
Base64 is an encoding for representing bytes as text; it does not compress or encrypt an image. RFC 4648 describes the Base64 encoding groups, while RFC 2397 defines the data URL form. The prefix identifies a media type; adding a PNG label to JPEG bytes does not convert the underlying image format.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Select image-to-Base64 to encode a file, or Base64-to-image to decode and preview text. Switching modes clears the current value, so copy anything you need to keep first.
Select a single image file no larger than 5 MB. The resulting text includes the data URL prefix and can be copied from the output area. Check that its media type matches the original file.
Paste a complete data URL or Base64 text. For text without a prefix, the page assumes PNG for preview. If the bytes belong to another format, supply its correct image data URL prefix before judging the result.
When the image loads, inspect its appearance and displayed details before downloading. Use Clear before starting another task if you want to remove the current value.
Use cases
See how the tool fits into real work and everyday tasks.
If a configuration, message, or API sample contains an image data URL, paste it into the decode mode to check whether it displays and to view its dimensions and reported type.
Encode one image when a demonstration needs to carry its image data in a text snippet. Since Base64 expands the encoded data and adds a prefix, consider whether linking a separate image file is a better fit for a larger asset.
When an export includes a complete Base64 image field, preview it and download the decoded image. Truncated text cannot recreate bytes that are missing from the source.
Q&A
Find concise answers to common questions and confusing cases.
Yes, the page tries to preview unprefixed text as PNG. If the image bytes are another format, use the correct data:image/…;base64, prefix; the assumed label does not transcode the image.
Base64 represents each group of three input bytes with four encoded characters, with padding for a final partial group. The data URL also adds a prefix, so the result is text overhead rather than compression.
No. The file mode accepts one image at a time, with a 5 MB file-size limit. Finish or copy that result before selecting another file.
The text may be incomplete or malformed, the bytes may not be a supported image, or the data URL media type may be wrong. Check that the full encoded value is present and that its prefix matches the actual image data.
Notes
Review scope, result limitations, and important precautions before use.
File selection is limited to 5 MB per image. A file accepted by the picker may still fail to decode in the current browser. The displayed decoded size is an estimate based on text length and should not be treated as a precise file audit.
Long Base64 strings can make documents and source files larger and less convenient to maintain. Base64 does not provide confidentiality: a person with the encoded value can attempt to recover the image. Avoid placing sensitive images in a string on the assumption that encoding protects them.
Related
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