Instant encode
Results appear as soon as the file is read — no extra click.
Image to Base64
Convert an image to Base64 instantly
Convert an image to Base64, Data URI, HTML or CSS instantly — in your browser, with no quality loss.
Upload an image to encode
Drop anywhere, or choose an option below.
JPGPNGWebPAVIFHEICTIFFBMP
Up to 1 images15.00 MB eachBatch uploadDrop anywherePrivate processingAuto deletion
Files stay private while we process them, then they are deleted. Nothing is published unless you choose to share a result later.
Original bytes
Base64 represents the file exactly. Padding is preserved by default.
Copy-first UX
Switch output type and copy Base64, Data URI, HTML, or CSS in one click.
Stays in browser
Your image is processed in your browser and is not uploaded.
At a glance
Built for daily use
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How it works
Upload. Encode. Copy.
Step 1
Add an image
Upload a file or pick from disk.
Step 2
Encode
We convert binary → Base64 in your browser.
Step 3
Copy or download
Grab Raw Base64, Data URI, HTML, CSS, or JSON.
Why this encoder
Simple. Privacy-first.
Four primary outputs
Base64, Data URI, HTML, and CSS from one encode.
Size comparison
See original vs Base64 size and the real percentage increase.
HTML & CSS options
Optional alt, size, loading, and full CSS rules when you need them.
Large-string safe
Truncated preview for huge outputs — copy/download still use the full string.
Data URI preview
Check that the encoded image displays correctly in a constrained preview.
Copy-ready results
Plain-text viewer, character counts, and TXT/JSON downloads.
Formats & limits
What you can send and get back
Supported formats
JPG, PNG, WebP, AVIF, GIF, SVG, and other image types your browser can read as files.
Exact bytes
We encode the original file — no decode/re-encode, so quality never changes.
Outputs
Raw Base64, Data URI, HTML img tags, CSS background-image, and JSON.
Privacy
Your image is processed in your browser and is not uploaded.
Max file size
Up to 15 MB per image for safe in-browser encoding.
Single image
Encode one file at a time.
Questions
Before you upload
Base64 turns an image into text so you can paste it into a webpage, email, or document without a separate image file.
Raw Base64 is only the encoded characters. A Data URI adds a short header so the text can be used directly as an image source.
No. We encode the original file exactly. There is no re-compression or quality loss.
No. Encoding runs entirely in your session for this tool. The image is not uploaded.
Small icons, email templates, quick prototypes, and tiny backgrounds. Avoid it for large photos - the text form is about a third larger than the file.
No. This tool turns an image into Base64 text. It does not rewrite links or special characters in a URL.
Learn
What is image Base64?
Base64 turns an image into plain text so you can embed it inline. A PNG becomes a long string that HTML, CSS, or other documents can carry without a separate file.
A Data URI wraps that string with a format prefix (for example data:image/png;base64,…). HTML uses it in src; CSS uses it inside url().
Usage
How to use Base64 in HTML and CSS
In HTML: <img src="data:image/png;base64,…" alt="" />. Keep alt meaningful for accessibility when the image conveys information.
In CSS: background-image: url("data:image/png;base64,…");. Prefer Base64 for small decorative assets — large strings bloat stylesheets.
Guidance
When should you use Base64 images?
Use Base64 for small icons, email templates, and prototypes. Skip it for large photos, galleries, and performance-sensitive pages — Base64 typically increases size by about 33%.
This tool encodes the original file exactly. It does not resize, compress, or convert the image. Use Compress, Resize, or Convert when you need a smaller or different file first.