Click to select an image (max 8 MB)
Free Base64 Image Converter
Convert an image file into a Base64 data URL you can embed directly in HTML, CSS, or JSON — or paste a Base64 string to preview and download it as an image file. It helps developers embed small images in HTML, CSS, JSON fixtures, or tests when a data URI is more convenient than a separate file.
What a Base64 image data URL is
A data URL embeds a file's contents directly inside a string using Base64 encoding, in the form data:image/png;base64,<encoded data>. Browsers treat this exactly like a normal image source, so it can be used anywhere a regular image URL would go — an <img src> attribute, a CSS background-image, or a field in a JSON payload — without needing a separate network request to fetch the file.
How to use this tool
Switch to Image to Base64 and select an image file to get its data URL, ready to copy into your code, along with a live preview so you can confirm it's the right file. Switch to Base64 to Image and paste either a full data URL or a bare Base64 string to render a preview and download it back out as an image file.
Common use cases
- Embedding a small logo or icon directly into an HTML email template, where external images are often blocked
- Inlining a tiny placeholder image into CSS to avoid an extra HTTP request
- Decoding a Base64 image string found in an API response or a browser devtools network payload to see what it actually is
- Bundling a small icon directly into a JSON configuration file or a single-file HTML prototype
Everything happens locally using your browser's built-in file and image APIs — no image you convert here is ever uploaded to a server.
How to use Base64 Image Converter for related tasks
Choose an image or paste a data URL, convert it, and consider payload size because Base64 increases the encoded text compared with binary storage.
Related tools: Image Resizer / Cropper, Favicon Generator.
Frequently asked questions
Why would I convert an image to Base64?
Base64-encoded images can be embedded directly in HTML, CSS, or JSON as a data URL instead of a separate file request — useful for small icons, inline email images, or bundling a tiny image with a single API response. It comes at the cost of roughly 33% larger data size than the original binary file.
Is there a file size limit?
Yes — uploads are capped at 8 MB. Base64 encoding is meant for small images like icons and logos; large photos should stay as regular image files referenced by URL.
What formats does the decoder accept?
Paste either a full data URL (starting with "data:image/...;base64,") or just the raw Base64 string on its own — the decoder detects which one you pasted and renders a preview either way.
Is my image uploaded to a server?
No. The encoding uses your browser's built-in FileReader API to read the file locally, and decoding just renders the pasted string as an image in your browser — nothing is ever sent anywhere.
When should I use a Base64 data URI?
Use it for small self-contained assets or fixtures; larger images are usually better served as normal files for caching and page performance.