Images & documents
Free Image URL to Base64 Converter
Fetch an image from an HTTPS URL and convert it to a Base64 data URL in your browser. Works with hosts that allow cross-origin requests.
How to use this tool
- Paste the full HTTPS URL of a PNG, JPEG or WebP image.
- Convert it; the browser downloads the image directly from that host.
- Copy the data URL or download it as a text file.
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Open tool ↗Frequently asked questions
Image URL to Base64 converter
questions.
Why does the conversion fail for some URLs?
Browsers block cross-origin image data unless the host sends CORS headers. Many CDNs allow it; many websites do not. Save the image and convert the file instead.
Does Form Koi download the image for me?
No. Your browser fetches it directly, so the request comes from your device and the image never touches our servers.
Is anything I enter saved or sent to Form Koi?
No. Everything you type or upload stays in this browser tab and is processed locally. Copy or download anything you want to keep before leaving the page.
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