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Image & Media

Image to Base64 Converter

Convert a JPEG, PNG, or WebP file into a ready-to-use Base64 Data URL, with a live preview and the exact size overhead shown.

How this differs from the Base64 Encode/Decode tool

The general Base64 Encode/Decode tool works on text you type or paste. This tool is image-specific: it accepts a real image file, produces a MIME-aware data:image/...;base64,... URL ready to paste directly into HTML/CSS, shows a live preview, and reports the file size and Base64 size-overhead — none of which the text-based tool does. The file's original bytes are read directly and encoded as-is, with no re-encoding or quality loss.

Your image is processed locally in your browser — it is never uploaded anywhere.

Convert a JPEG, PNG, or WebP file into a ready-to-use data:image/...;base64,... URL you can paste directly into HTML, CSS, or JSON — with a live preview and the exact Base64 size overhead shown.

The file's original bytes are encoded as-is via FileReader — never re-encoded through canvas — so there's no quality loss or re-compression involved.

How to use the Image to Base64 Converter

  1. Click the Image (JPEG, PNG, or WebP) file picker and choose an image from your device.
  2. Wait for Reading… to finish; a preview appears with the file name, pixel dimensions, file size and the Base64 overhead.
  3. Click Copy Data URL for a complete data:image/...;base64,... string to use in HTML or CSS.
  4. Or click Copy Base64 to copy only the encoded part, without the data: prefix.

Example: Size overhead for a 48,000-byte PNG

Selecting a PNG that is exactly 48,000 bytes shows its size as 46.9 KiB. The Base64-only output is 64,000 characters, so the tool reports that Base64 is ~33% larger than the original binary. The Data URL is that same string with data:image/png;base64, in front.

Questions about the Image to Base64 Converter

Why is the overhead not always exactly 33%?
Base64 writes every 3 bytes as 4 characters and pads the last group, so very small files show a higher percentage. A 100-byte file becomes 136 characters, which the tool reports as ~36%.
Which files are rejected?
Only JPEG, PNG and WebP are accepted. Other types, such as GIF or SVG, are refused with an Unsupported file type message. Files over 25.0 MiB, empty files, and images larger than 25 megapixels are also rejected, as are files that cannot be decoded as an image.
Can I convert several images at once?
No. The picker takes one file at a time, and choosing a new file replaces the previous result.
When is a Data URL a good idea?
It suits small images like icons, where saving a separate request matters more than the extra size. Large photos make HTML or CSS files much bigger and cannot be cached on their own, so a normal image file is usually better for them.