Answers to the most common questions about Base64 encoding
Base64 is an encoding scheme that converts binary data (like images) into a string of ASCII characters. This allows images to be embedded directly in HTML, CSS, or JSON without requiring a separate image file.
Many browsers (especially older ones) struggle with very long Base64 strings. For typical use cases like icons, logos, email signatures, and CSS backgrounds, 1.5 MB is more than sufficient. Statistically, 99% of uploaded images are smaller than 200 KB.
No. All conversion happens locally in your browser. Your images never leave your computer – no data is sent to our servers or any other servers.
IE 8 has a technical limitation: Base64 data may not exceed 32 KB. This restricts usage to very small images like icons or favicons. IE 9 and all modern browsers don't have this restriction.
The Base64 Converter supports JPG, JPEG, PNG, GIF, WebP, SVG, and BMP. SVG files work particularly well as they are often very small.
Base64 is ideal for small icons, logos, email signatures (where external images are often blocked), single-file HTML bundles, mockups, and prototypes. For larger images, it's not recommended as file size increases by 33%.
You can convert up to 20 images simultaneously. They are processed sequentially in the browser – without delays.
Use the img tag with a data URI: . The converter generates the code automatically – just click 'Show Code' and copy.
As a CSS background-image: background-image: url('data:image/jpeg;base64,...');. You can copy this code directly from the converter.
Base64 encoding increases file size by approximately 33%, as binary data is converted to a text-based format. This is the trade-off for being able to embed images directly in source code.
Yes! Use the reverse mode below the converter. Simply paste a Base64 string and download the image as PNG.
Yes. Your images never leave the browser. There is no analysis, tracking, or sharing of data.
Yes! The tool is fully responsive and works on smartphones and tablets. Note that phone photos are often very large.
Currently, the tool is designed for manual use only. Contact us if you're interested in an API solution.
. The converter generates the code automatically – just click 'Show Code' and copy.