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Image to Base64 / Data-URI Converter
An Image to Base64 converter turns a picture file into a data: URI, a text string that carries the whole image inline so it can be embedded directly in HTML, CSS, JSON, or an email template without a separate file request. The same string can be decoded the other way, back into a real image you can preview and download. Base64 is the standard way to inline small assets like icons, logos, and tracking pixels so the browser does not have to make an extra round-trip to fetch them.
This tool is free and runs entirely in your browser. The image is read with the FileReader API and never leaves the page, so there is no upload, no server, and nothing logged. It reports the original byte size, the Base64 length, and the roughly 33% size overhead Base64 adds, then hands back copy-ready snippets for an <img> tag and a CSS background.
🔒 Private: everything runs in your browser. Nothing you paste is uploaded.
Paste a valid image data URI to enable download.
🔒 Private: everything runs in your browser. Nothing you paste is uploaded.
How to use the Image to Base64 converter
Drop or browse to an image to encode it, switch to the decode tab to paste a data URI back into a downloadable file. Everything is computed locally as soon as the file is read.
Encode an image into a data URI
Drag an image onto the drop zone or click to browse, and the converter reads it locally with FileReader.readAsDataURL. The preview appears instantly alongside the file type, pixel dimensions, original byte size, the Base64 length, and the exact percentage overhead the encoding adds. Use the snippet selector to switch between a raw data URI, a complete <img> tag, and two CSS background variants, then copy the one you need. Because the work happens in the browser, even confidential or unpublished artwork stays on your machine the entire time.
Decode Base64 back into a real image
Paste a full data:image/...;base64, URI or a raw Base64 payload into the decode tab and the tool validates it character by character before rendering. It checks that the string contains only valid Base64 characters and that its length is a multiple of four, flagging a truncated or corrupted paste instead of failing silently. A valid image renders in the checkerboard preview with its decoded size and dimensions, and the download button saves it with the correct extension inferred from the MIME type.
Know when inlining helps and when it hurts
Base64 inlining removes an HTTP request, which is useful for tiny, frequently reused assets such as icon sprites, SVG glyphs, or a logo in a transactional email where external images are often blocked. The trade-off is size: Base64 inflates the payload by about a third and cannot be cached separately from the document that contains it. As a rule of thumb, inline assets under a few kilobytes and keep larger images as ordinary cached files. The overhead figure this tool reports makes that decision easy to see before you commit.
Image to Base64 frequently asked questions
Q1What is a Base64 data URI?
A data URI is a string that begins with data: and embeds a file’s contents directly inside HTML, CSS, or JSON instead of linking to it. For images the format is data:image/png;base64, followed by the Base64-encoded bytes. The browser decodes the string and renders the image inline, with no separate network request needed to fetch the file.
Q2Does this converter upload my image anywhere?
No. The image is read in your browser with the FileReader API, and every calculation runs in client-side JavaScript. Nothing is uploaded, logged, or stored on any server, and the tool keeps working offline once the page has loaded. That makes it safe for confidential, unpublished, or client artwork you do not want leaving your machine.
Q3Why is the Base64 string larger than the original file?
Base64 encodes every three bytes of binary data as four text characters, so the encoded string is about 33% larger than the source file, plus a short header. The tool shows the original size, the Base64 size, and the exact overhead percentage so you can weigh whether inlining is worth the extra weight for a given asset.
Q4When should I inline an image as Base64 instead of linking it?
Inlining suits very small, reused assets where saving an HTTP request matters: icons, SVG glyphs, or a logo in an email where external images are blocked. For larger images, a normal linked file is better because it can be cached separately and reused across pages. A common guideline is to inline assets under a few kilobytes and link anything bigger.
Q5Which image formats can I convert?
Any raster or vector format the browser recognizes works, including PNG, JPG, GIF, WebP, SVG, ICO, BMP, and AVIF. The converter reads the file’s MIME type directly so the resulting data URI carries the correct type, and the decoder infers the right file extension from that type when you download a decoded image back to disk.
