Image to Base64 Converter

Image to Base64 Converter transforms local image files into Base64 text so you can embed, transmit, or store image data in text-based systems. It also supports decoding Base64 back into viewable images for troubleshooting and migration workflows. When you need to work with plain text values alongside image payloads, use Base64 Encoder. If that output must travel in links or query params, follow with URL Encoder.

How to use

1. Upload an image by dragging and dropping or using the file picker.
2. Choose output mode: raw Base64, data URI, HTML img snippet, or CSS background-image.
3. Copy the result and paste it into your code, template, or API payload.
4. To reverse, switch to decode mode and paste an existing Base64 string.

If you want to quickly distribute the resulting data URI or source URL to mobile users, generate a scannable code with QR Generator.

Key features

• Two-way conversion: image to Base64 and Base64 back to image.
• Multiple export formats for HTML, CSS, and API workflows.
• Instant preview to verify that encoded and decoded content matches.
• One-click copy for fast integration into code and content tools.

Common use cases

• Inlining small logos, icons, and placeholders in HTML or CSS.
• Sending image data in JSON bodies where multipart upload is unavailable.
• Creating self-contained documentation, demos, or offline HTML bundles.
• Validating and restoring Base64 image payloads from logs or databases.

Technical details

Base64 encodes binary content by taking 24-bit chunks (3 bytes) and mapping them to 4 characters from a fixed alphabet. Because 4 output characters represent 3 input bytes, the encoded result is approximately 33 percent larger than the original binary file.

A data URI begins with a MIME prefix such as data:image/png;base64, followed by raw Base64. This is convenient for direct embedding, but it increases HTML and CSS payload size and can reduce cache efficiency for larger assets. A practical rule is to inline only small static assets and keep larger images as separate files.

When Base64 appears in URLs or route segments, standard characters like + and / may require escaping. Use URL Encoder or URL-safe alternatives before publishing links. If you need to inspect or transform text-only segments, Base64 Encoder is often the fastest companion tool.

FAQ

Which image formats can I convert to Base64?

You can convert common formats such as PNG, JPEG, GIF, WebP, SVG, BMP, and ICO. The output can be copied as raw Base64 or as a data URI.

When should I use a data URI instead of an image file URL?

Data URIs are useful for small assets like icons and inline graphics. For large images, separate files are usually better for caching and page weight.

Why is Base64 image output larger than the original file?

Base64 expands binary data by about one third because it maps 3 bytes into 4 text characters. This size overhead is expected for all Base64 encoders.

Can I share Base64 image strings in URLs safely?

Only after applying URL-safe handling where needed. Standard Base64 contains characters that may conflict with URL parsing, so encoding the value is often required.

Privacy note

Image processing is done entirely in your browser via local APIs. Uploaded files and generated output are not sent to external servers.