HEIC to JPG
Turn iPhone photos into JPGs that open anywhere.
JPG
Image to Base64
Turn an image into a data URI you can paste straight into CSS, HTML or Markdown. The encoding happens in your browser — the file is never uploaded.
Drop your images hereChoose your images
or pick them from your computer — up to 1 at a time.
JPGPNGWebPAVIFGIFSVGMax 5 MB each
When a data URI is worth it
Embedding an image saves a network request, which is useful for tiny icons, email templates where attachments are awkward, and single-file demos.
It costs size. Base64 stores three bytes in four characters, so the text is about a third larger than the file, and it cannot be cached separately from the page that holds it. Above roughly 10 KB, a normal image file is usually the better choice.
How to use Image to Base64
Add your image
JPG, PNG, WebP, AVIF, GIF or SVG, up to 5 MB. It is encoded in your browser.
Pick the format
The plain data URI, or ready-made CSS, HTML or Markdown.
Copy or download
Copy it to the clipboard, or save it as a .txt file.
Why use SlimFile.app for this
Nothing is uploaded
The encoding happens in your browser, which is the honest way to do it: the encoded text is the file.
Paste-ready snippets
The data URI on its own, or wrapped for CSS, HTML and Markdown.
Free, no sign-up
No account, no email address, no trial that runs out.
No watermark
What you download is clean — nothing added to your file.
Never leaves your device
This tool runs entirely in your browser. Your file is not uploaded anywhere.
Questions
When should I use a Base64 image?
For tiny icons, email templates where attachments are awkward, and single-file demos — anywhere saving a network request is worth more than the extra size.
Why is the Base64 text bigger than my file?
Base64 stores three bytes in four characters, so the text is about a third larger than the image. Above roughly 10 KB, a normal image file is usually the better choice.
Can I convert an SVG?
Yes. SVG is accepted here because this tool only encodes the bytes and never has to read the file.
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