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Image to Base64 Converter
Free online image to base64 converter
Source image
ANY BASE64 Local processingConverted preview
Base64 output
The result will appear here after you run the tool.
The full base64 string is available in the copy action and in the text file download.
Press Ctrl or Command and Enter to run the tool.
About this tool
About this tool
Image to Base64 Converter draws the image onto a canvas, exports it in the selected format, and converts the bytes to base64. A data URL prefix can be included for direct use in HTML and CSS. The full string is shown, copyable, and downloadable as a text file.
Turn any image into a base64 string you can embed directly in HTML, CSS, JSON, or an API payload. Choose the output format, decide whether to include the data URL prefix, and copy the result or download it as a text file. The encoding happens locally in your browser.
Built for daily work
- Embed small images directly in HTML email and single-file pages.
- Store image data inside JSON configuration and test payloads.
- Send image bytes through APIs that accept base64 fields.
- Inline icons in CSS without extra HTTP requests.
How to use this tool
How to use this tool
Pick the output format
PNG suits graphics, JPEG shrinks photos, and WebP balances both.
Encode and copy
Run the conversion, copy the base64 string, or download it as a text file.
Key features
Key features
Data URL or raw base64
Include or omit the data:image prefix depending on where you will paste the string.
Format choice
Encode as PNG, JPEG, or WebP to control size and transparency.
Copy and download
Grab the full string with one copy action or save it as a text file.
Local encoding
The image never leaves your browser during encoding.
Practical use cases
Practical use cases
- Embed small images directly in HTML email and single-file pages.
- Store image data inside JSON configuration and test payloads.
- Send image bytes through APIs that accept base64 fields.
- Inline icons in CSS without extra HTTP requests.
- Create portable data files for documentation and demos.
Private by default
For local tools, input is processed in your browser and is not sent to application analytics.
Data processing noticeTechnical details
Technical details
ProcessingLocal browser processing
OutputConverted image file, downloaded directly
Maximum local file25 MB per image
Limitations and important notes
Limitations and important notes
- Base64 increases payload size by roughly 33 percent.
- Very large images produce extremely long strings.
- The prefix only applies to the included data URL form.
Frequently asked questions
Frequently asked questions
A data URL adds the prefix such as data:image/png;base64, before the encoded bytes, which lets browsers render the string directly as an image.
For small assets embedded in documents, emails, or payloads. Large images are better served as files because base64 adds about 33 percent to the size.
No. The canvas API encodes the image entirely in your browser.
Base64 represents every three bytes with four characters, so the string is about a third longer than the binary file.
Related guides and solutions
Related guides and solutions
What local browser processing means for online tools
A transparent explanation of local tool processing, temporary browser memory, local storage, downloads, analytics boundaries, and cases that require remote services.
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