Free Online Blob ↔ DataURL Converter — Image URL Format Converter
Convert images between Blob URLs and Data URLs with our free online converter. Upload any image and instantly get both URL formats: a Blob URL for efficient in-memory image handling and a Data URL (base64) for embedding images directly in HTML, CSS, or JavaScript. Essential for web developers working with canvas, file uploads, image preprocessing, or inline image data. All processing happens locally in your browser.
Upload one or more images — JPG, PNG, WebP, and more formats are supported.
View each image's Blob URL and Data URL (base64) side by side.
Copy the desired URL format to your clipboard with one click.
Tips for Using Blob and Data URLs
- Use Blob URLs for temporary, in-memory images — they're more memory-efficient than Data URLs for large files.
- Use Data URLs (base64) for small images you want to embed directly in HTML or CSS, avoiding extra HTTP requests.
- Blob URLs are only valid within the current page session. They cannot be shared across browser tabs or stored for later use.
Frequently Asked Questions — Blob ↔ DataURL Converter
What is a Blob URL?
A Blob URL (or object URL) is a temporary URL created by the browser that points to an in-memory Blob object. It starts with 'blob:' and is only valid within the current page session. Blob URLs are memory-efficient and ideal for displaying images without needing a server.
What is a Data URL?
A Data URL (or data URI) encodes the image data directly into the URL using base64 encoding. It starts with 'data:image/...;base64,...' and can be used anywhere a normal URL is expected. Data URLs are self-contained but produce larger string representations than the original binary file.
Which format should I use?
Use Blob URLs for displaying images dynamically in your app — they're efficient and easy to revoke. Use Data URLs for embedding small images directly in HTML/CSS/JS, creating self-contained documents, or when you need to store the image data as a string. For images larger than a few KB, Blob URLs are generally preferred for performance.
Is the converter free?
Yes, completely free. No registration, no hidden charges, and no watermarks. All processing happens locally in your browser.
Do you support batch conversion?
Yes! You can upload multiple images at once. Each image will show its Blob URL and Data URL, and you can copy the URL you need for each one individually.
How long is a Blob URL valid?
A Blob URL is valid only within the current page session. It is automatically revoked when the page is closed or refreshed. For long-term storage, use the Data URL or download the original file.
Does encoding to base64 increase file size?
Yes, base64 encoding increases the size by approximately 33% compared to the original binary file. This is standard for all base64 encodings. For large images, using a Blob URL is more efficient as it preserves the original binary format.