Convert images to Base64 encoded strings, or paste a Base64 string to preview and download the image. 100% private - no server upload.
📂
Click to upload or drag & drop an image
PNG, JPG, GIF, WebP, SVG supported
About Image ↔ Base64 Converter
Encode any image to a Base64 string for embedding in HTML, CSS, or JSON. Or decode a Base64 string back to a viewable and downloadable image. Supports all major image formats. Copy the result as a raw Base64 string, a full data URL, or a ready-to-use HTML <img> tag.
How to Use - Image to Base64
Select the Image → Base64 tab.
Upload any image file (PNG, JPG, GIF, WebP, SVG).
The Base64 encoded string appears instantly below the preview.
Click Copy Base64 to copy the raw string, Copy Data URL for the full data:image/... URI, or Copy <img> tag for a ready-to-paste HTML snippet.
How to Use - Base64 to Image
Select the Base64 → Image tab.
Paste your Base64 string (with or without the data:image/...;base64, prefix).
Click Decode Image to preview the image.
Click Download Image to save it to your device.
Frequently Asked Questions
Base64 is a method of encoding binary data (like image files) into a text string using only ASCII characters. This lets you embed image data directly into HTML, CSS, or JSON without needing a separate image file or URL.
Base64 is useful for small icons or logos embedded directly in CSS or HTML to eliminate an extra HTTP request. It is also used in emails (where external images may be blocked) and in JSON APIs that transfer image data as text.
Base64 encoding increases the data size by approximately 33% because every 3 bytes of binary data are represented as 4 characters of text. For large images this overhead can be significant, which is why Base64 is best suited for small images.
A Data URL (or data URI) combines the MIME type and the Base64 string into a single string in the format data:image/png;base64,.... You can use it anywhere a normal image URL is accepted, such as in an HTML src attribute or CSS background-image.
No. The entire conversion happens in your browser using the FileReader API. Your image data never leaves your device.
About Image to Base64 Converter — Encode and Decode Images Online
This free image to Base64 converter encodes any image file into a Base64 data URI string — and decodes Base64 strings back to a viewable image — entirely in your browser. The resulting data URI can be embedded directly in HTML <img> tags, CSS background-image properties, JSON data objects, or email HTML templates without requiring a separate file request. No server upload, no account, no limit on file size.
Base64 is a binary-to-text encoding scheme that represents binary data (like image bytes) using only 64 ASCII characters (A–Z, a–z, 0–9, +, /). It was designed to safely transmit binary data through systems that only handle text — originally email protocols like SMTP, which were designed for 7-bit ASCII. The same encoding principle that makes Base64 safe for email transmission makes it useful for embedding binary images directly into text-based formats like HTML, CSS, JSON, and XML. The data URI format wraps a Base64-encoded image with its MIME type in a self-contained string: data:image/png;base64,iVBORw0KGg...
How to Use the Image to Base64 Converter
Click Upload Image or drag and drop an image file into the upload area. JPEG, PNG, GIF, WebP, SVG, and BMP formats are all supported.
The complete Base64-encoded data URI appears instantly in the output area — this is the string that begins with data:image/png;base64, or the equivalent MIME type for your image format.
Click Copy to copy the full data URI to your clipboard, ready to paste into HTML, CSS, or JSON.
To decode a Base64 image string: switch to Decode mode, paste the Base64 data URI into the input area, and click Decode to preview the image and optionally download it as a file.
How the Base64 Encoding Works
The browser reads the image file using the FileReader.readAsDataURL() API, which returns a complete Base64-encoded data URI including the MIME type prefix. To decode, the data URI string is set as the src attribute of a hidden <img> element — if the browser can parse the Base64 data and render the image, a download link and preview are generated. All processing is local; no network requests are made with your image data.
When to Use Base64 Image Encoding
Embedding image as Base64 is best for small images under ~10 KB. Use a separate file URL for larger images — the 33% size increase from Base64 encoding and the loss of browser caching make inline Base64 counterproductive for large images.
Tips for Using Image to Base64 Converter Effectively
Use Base64 for small icons and inline email images: The main use case for Base64 image encoding is eliminating HTTP requests for small images (under ~10 KB) and embedding images in HTML emails where external image URLs may be blocked by email clients. For icons, avatars, simple illustrations, and inline email graphics, Base64 encoding is the right approach. For hero images, product photos, or any image above 10 KB, a separate URL is almost always better.
Compress images before encoding: Since Base64 encoding increases file size by approximately 33%, start with the smallest possible image file. Use the Image Compressor tool on this site to compress a JPEG or PNG before converting to Base64 — a 5 KB compressed image encoded to Base64 produces ~6.7 KB of text, compared to ~13.3 KB for an uncompressed 10 KB source image.
Use in CSS for background images with no external dependency: Data URIs in CSS eliminate external file dependencies — useful for CSS files that need to be self-contained, such as those distributed as part of a component library or embedded in a single-file HTML document. Example: background-image: url('data:image/svg+xml;base64,...'); SVG icons encoded as Base64 in CSS are particularly common in design systems and UI component libraries.
Use SVG source format when possible: SVG files are already text-based XML, which means they can be embedded in HTML or CSS as plain text (without Base64 encoding) using data:image/svg+xml,<svg...> URL encoding rather than Base64. However, for maximum compatibility across older browsers and email clients, Base64-encoding the SVG is safer. This converter supports SVG input for Base64 encoding.
Decode Base64 strings to verify content: If you receive a Base64-encoded image in an API response, a data URI in a source file, or a JSON payload and want to see what image it contains, use the Decode mode: paste the Base64 string and click Decode. The tool renders the image immediately so you can verify it is the expected content without writing any code to decode it manually.
Frequently Asked Questions about Image to Base64 Converter
Base64 encoding is used for images in three main scenarios: (1) eliminating HTTP requests for small images in web pages, where the round-trip latency of a separate request costs more time than the 33% size increase; (2) embedding images in HTML email templates, where external URL images are often blocked by email clients for privacy reasons; and (3) embedding images in self-contained single-file HTML documents, JavaScript bundles, or JSON API responses where separate file references are not possible or convenient. Base64 is most beneficial for images under ~10 KB.
No — Base64 encoding increases file size by approximately 33% compared to the binary original, because it represents 3 bytes of binary data as 4 ASCII characters. A 9 KB PNG icon becomes approximately 12 KB when Base64-encoded. The trade-off that justifies this size increase is eliminating the HTTP request overhead: for very small images, the time saved by avoiding a separate request (which involves DNS lookup, TCP connection, and HTTP headers) outweighs the extra bytes. For images larger than ~10 KB, loading a separate file is almost always more efficient overall.
Any image format that your browser can read is supported: JPEG (.jpg, .jpeg), PNG (.png), GIF (.gif), WebP (.webp), SVG (.svg), and BMP (.bmp). The converter uses FileReader.readAsDataURL(), which preserves the original file format — a PNG is encoded as data:image/png;base64,... and a JPEG as data:image/jpeg;base64,.... The MIME type is set automatically based on the file's format, ensuring the data URI is recognised correctly by browsers and email clients.
No — the entire conversion process happens locally in your browser using the FileReader API. Your image file is read into memory in your browser tab and converted to Base64 text using JavaScript, with no network requests made involving your image data. This makes the tool safe for sensitive images — medical images, proprietary designs, private photographs, or any file you would not want to upload to an external service. You can verify this by disconnecting from the internet after loading the page; the converter will continue to work without any network access.
Copy the full data URI from the converter output (the string starting with data:image/...) and use it as the src attribute of an <img> tag: <img src="data:image/png;base64,iVBORw0KGgo..." alt="Icon">. The browser interprets the data URI directly as the image source without making a network request. You can also use Base64 data URIs in CSS background images: background-image: url('data:image/png;base64,...'); Both usages are supported in all modern browsers and most email clients.
There is no software-imposed maximum file size limit — the converter processes whatever file your browser and device memory can handle. However, very large images produce very large Base64 strings: a 1 MB image encodes to approximately 1.33 MB of Base64 text. Embedding a 1.33 MB string inline in HTML or CSS is impractical and will slow page rendering. For images above ~10 KB, a separate file URL with browser caching is significantly more efficient. Reserve Base64 encoding for small icons, logos, and decorative graphics where the latency of a separate HTTP request is the bottleneck.
Yes — this image to Base64 converter is completely free. No account is required, no app is downloaded, and there are no usage limits. Both encode (image to Base64) and decode (Base64 to image) modes are available without any restriction. The tool works in any modern browser on desktop and mobile. Since all processing is local, it works even without an internet connection after the page loads. Simply upload an image or paste a Base64 string and get your result instantly.
Base64 encoding increases output length by approximately 33% over the input binary size, plus the data URI prefix (data:image/png;base64, adds about 22–26 characters). A 5 KB PNG icon produces approximately 6,800 characters of Base64 text. A 50 KB image produces approximately 68,000 characters. A 1 MB image produces approximately 1.37 million characters. For practical use in HTML or CSS, strings above ~15,000 characters (roughly 10 KB images) become unwieldy — they slow down HTML parsing, are difficult to read in source code, and cannot be cached by the browser separately from the HTML file that contains them.