Email Client Base64 Guide
Free online email clients tool. Browser-based, private, no uploads.
Drop your image here, encode to Base64 instantly
JPG, PNG, WebP, GIF, AVIF, HEIC, BMP, TIFF, SVG supported
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Base64 Output
Related reading
Email Client Base64 Guide
Use Base64 in L clients. Gmail, Outlook 2007+, Apple Mail, Yahoo, and Thunderbird support Base64 inline images; test older clients.
Why it matters: Gmail, Outlook 2007+, Apple Mail, Yahoo, and Thunderbird support Base64 inline images; test older clients. Generate the string here and drop it straight into your code.
How to convert an image to Base64 (and back)
- 1Choose Encoder to turn an image into Base64, or Decoder to turn a string back into an image.
- 2Pick your output — raw, URL-safe, no-padding, or wrapped — and decide whether to include the data: prefix.
- 3Copy to clipboard or download as a file. Everything runs locally — nothing is uploaded.
Best settings for this page: Encode your asset above, then paste the Base64 into your L clients project.
All processing runs locally in your browser. Your images and strings are not uploaded to any server.
Base64 basics: size, data URIs, and when to use it
Size trade-off — Base64 inflates binary data by about 33%. It is best for small assets (icons, logos) and single-file pages; for large images, external files with caching are faster.
Data URI — a data URI is raw Base64 prefixed with a MIME type, e.g. data:image/png;base64,.... Include the prefix for HTML/CSS; store raw Base64 for JSON or databases.
URL-safe — RFC 4648 §5 swaps + and / for - and _ and drops padding, making the string safe for URLs, JWTs, and filenames.
Use it for embedding images in code, email, and APIs where an extra HTTP request is worse than the size cost.
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