Free Image to Base64 Converter — Data URI Encoder

How it works

Sometimes you need an image as text — embedded in CSS, pasted into an HTML email, or sent inside a JSON payload. This converter reads your image file and outputs its Base64 data URI, keeping the original bytes exactly as they are: no re-encoding and no quality loss. You also get a preview plus the file’s size and dimensions, so you know precisely what you are embedding.

Image to Base64 Converter

Encode any image as a ready-to-paste Base64 data URI — original bytes, zero re-encoding, nothing uploaded.

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100% Free Forever No Sign-up No Credit Card Private — files never leave your browser Unlimited Use

1 Choose an image

Drag & drop an image here or click to browse — PNG, JPG, GIF, WebP, SVG and more

2 Your Base64 data URI

✅ Encoded

File: — (—)

Original size: — · Dimensions: —

Data URI length: —

This data URI keeps your file's exact original bytes — it is read directly with FileReader, never re-encoded, so it decodes back to the identical image.

3 Copy or save it

Copy data URI Download .txt

Paste the data URI anywhere an image URL goes — a CSS background-image, an <img> src, HTML email, or a JSON payload.

🎉 Free forever. No sign-up. No credit card. No limits.

This tool runs entirely in your browser — encode as many images as you like, as often as you like.

Everyday uses

• CSS backgrounds — inline small images and icons directly in a stylesheet, no extra HTTP request.
• HTML email — embed logos and signatures where external images get blocked.
• Single-file demos — build shareable one-page HTML files with images baked in.
• API testing — generate the exact payload your endpoint expects for image uploads.
• Data URIs in code — documentation examples, test fixtures and placeholder assets.

Frequently asked questions

Does converting to Base64 change my image?

No. The file is read with FileReader.readAsDataURL, which encodes the original bytes exactly — decoding the data URI gives you back the identical file. The only cost is size: Base64 text is roughly 33% larger than the binary file.

Where can I use a data URI?

Anywhere an image URL goes: an img src, a CSS background-image, an HTML email, or a JSON field an API asks for. They are ideal for small images and icons; for large photos, a normal hosted file is usually better because the text version inflates the page weight.

Is my image uploaded to a server?

No. FileReader runs locally in your browser, so the image never leaves your device at any point.