Image to Base64 Converter — Encode Images Instantly
Upload an image or paste a URL to get Base64 encoding immediately. Copy as Data URL, HTML img tag, CSS background, or Markdown. All processing happens in your browser — nothing gets uploaded.
Drop an image here
or click to select — JPG, PNG, WebP, GIF all work
Why Convert an Image to Base64
Single File Delivery
Embed images directly in HTML or CSS and eliminate separate HTTP requests. Base64 encoded images travel as part of the document, reducing network calls and simplifying asset management.
Email Templates
Email clients block external images and treat attachments differently. Base64 inline images display consistently across Gmail, Outlook, and Apple Mail without broken image links.
100% Private
Your image never leaves your browser. The converter runs entirely using FileReader and Canvas APIs — everything stays local. No uploads, no servers, no privacy concerns.
Instant Encoding
No waiting for uploads or processing. Base64 encoding happens in milliseconds on your machine. Copy the result and paste it directly into your code.
How to Use This Tool
Choose Your Input Method
Upload an image file from your device or paste a URL. The upload option handles any image format your browser supports — JPG, PNG, WebP, GIF, SVG. URL mode fetches publicly accessible images from the web, though CORS restrictions may prevent some sources from loading.
Configure Your Output
Decide whether to include the Data URL prefix (the `data:image/png;base64,` part). Most use cases need it, but if you only want the raw encoded string, uncheck that option. Line wrapping at 76 characters is useful for email attachments and MIME standards, but web applications typically omit it.
Copy or Download
Click convert and the Base64 string appears instantly. Copy it directly or download as a text file for safekeeping. The format buttons give you ready-to-paste HTML img tags, CSS background-image declarations, or Markdown image syntax — all with the Data URL pre-filled.
When to Use Base64 (and When Not To)
Good: Small Icons and UI Elements
Favicons, social media icons, status indicators — anything under 10KB is a solid candidate. The Base64 string fits comfortably inline and saves an HTTP request. You avoid the waterfall delay where the browser waits for the CSS file, then waits again for each background image.
Good: Email Templates and Newsletters
Email clients are aggressive about blocking external images. Base64 images render reliably because they're part of the message body, not separate resources. This is why you see logo images that actually display in promotional emails instead of showing as broken links.
Avoid: Large Photos and Background Images
Base64 encoding increases file size by about 33%. A 100KB photo becomes a 133KB string — and that's before browser parsing overhead. For anything beyond small assets, external image files are more efficient. They cache separately, transfer with gzip compression, and don't bloat your HTML or CSS.
Avoid: Images That Change Frequently
User avatars, dynamically generated content, or anything that updates per user should stay as external URLs. Base64 strings are hard to cache granularly — changing the image means redeploying the entire HTML file. External images let you update assets independently and leverage CDN caching.
Frequently Asked Questions
Does this tool upload my image anywhere?
No. Everything happens in your browser using the FileReader and Canvas APIs. Your image is processed locally and never leaves your computer. That's why it works offline after the page loads.
What's the difference between Data URL and raw Base64?
A Data URL includes the prefix like `data:image/png;base64,` followed by the encoded string. This tells the browser the data type and encoding. Raw Base64 is just the encoded characters without the prefix. Use Data URLs for web development — raw Base64 for systems that expect the string only.
Why would I use line wrapping?
Line wrapping at 76 characters is the MIME standard for email attachments and some legacy systems. Modern web applications don't need it — in fact, unwrapped strings are slightly smaller. Only enable wrapping if you're embedding images in email templates or working with systems that require it.
Can I paste a URL from any website?
Only if the server allows cross-origin requests. Many websites block hotlinking and don't send CORS headers, which prevents the browser from reading the image data. If URL mode fails, try downloading the image and using the upload option instead.
How large of an image can I convert?
Technically, the browser can handle very large images, but the Base64 string grows by 33% and becomes unwieldy. A 5MB image turns into a 6.7MB text string — that's millions of characters. For practical purposes, keep your images under 500KB. Large photos and backgrounds should stay as external image files.
Does Base64 encoding work with animated GIFs?
Yes. The encoder preserves the entire file, including all frames and timing data. When you embed the Data URL in an `` tag, the animation plays just like the original GIF. The same goes for PNG transparency and WebP features — nothing is lost in the encoding process.