What this image to Base64 converter does
Base64 is a way of writing binary data — like a picture — using only ordinary text characters. Convert an image to Base64 and you get a very long string that any text file can hold: it can be pasted into an HTML page as an inline image (a "data URL" that starts with data:image/png;base64,…), dropped into a CSS file, stored in a JSON document, or sent through systems that only accept text. This converter reads your image file, encodes it on the spot, and hands you the complete data URL ready to copy — or, with one tick of the checkbox, the plain Base64 without the prefix, for tools and code that want the raw string. It also shows you the numbers that matter: the original file size, the size of the Base64 text, and the total character count.
Those statistics are there for a reason: Base64 is not compression. Encoding grows data by roughly a third — every three bytes of picture become four characters of text — so a 300 KB photo turns into about 400 KB of characters. That trade is sometimes worth it: a tiny icon or logo inlined into a page saves a separate file request and can never be a broken link. For photographs and anything large, it is usually a bad bargain, and a normal image file on a server will load faster and cache better. This page will not pretend otherwise; the size readout lets you make the call with the real figures in front of you.
How to convert an image to Base64
- Choose the image. JPG, PNG, WebP, GIF, SVG and BMP files all work.
- Read the statistics. Compare the original size with the Base64 size before committing to inlining it.
- Pick your form: leave the prefix on for a ready-to-paste data URL (use it as an <img src> or CSS background), or tick the box for plain Base64.
- Copy with the button — no fiddly selecting inside a giant string.
Where Base64 images are actually used
The honest list is shorter than most tool pages admit. Small website graphics inlined into HTML or CSS, where one file must contain everything. Email templates, which often cannot rely on hosted images. Test fixtures and sample data in development, where a real picture embedded in a JSON file keeps examples self-contained. Data exchange with APIs that accept images as Base64 fields in a JSON request — a pattern you will meet constantly if you send images to web services. And single-file documents — one HTML file that must work offline, emailed to someone, with its pictures inside it. If your use is one of those, this tool is exactly the bridge. If you simply want a smaller image file, you are in the wrong place — Base64 makes files bigger; our Image Compressor makes them smaller.
Frequently asked questions
What is the difference between the data URL and plain Base64?
The data URL is the complete package — 'data:image/png;base64,' followed by the Base64 text — and can be pasted directly wherever an image address goes. Plain Base64 is just the encoded text itself, which is what many APIs and code libraries expect as input.
Why is the Base64 version bigger than my file?
Base64 represents every 3 bytes of data with 4 text characters, so the encoded form is always about 33% larger, plus a short prefix. That is the known price of writing binary data as text — it is an encoding, not a compression.
Is there a size limit?
There is no limit set by this tool; the practical limit is your device's memory and your patience. Very large photos produce millions of characters of output, which most text boxes (and most uses) will struggle with — resize or compress first if the file is going somewhere size-sensitive.
Can I turn the Base64 back into my image?
Yes — that is the companion tool on this site, Base64 to Image. Paste the string there and you get your picture back as a downloadable file, byte for byte.
Private by design: encoding happens in your browser using its file reader. Your image is never uploaded — the Base64 text is generated on your device and stays there until you choose to paste it somewhere.