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What DPI means, and how to get a 300 DPI image
Why DPI changes print size and not quality, how large your photo can print, and how to set 300 DPI without re-compressing it.
New
Tool
Image to Base64
Encode an image as Base64 to embed it straight into HTML, CSS, JSON or an email template, with no separate file to host. Copy it as a data URI, a plain Base64 string, an <img> tag or a CSS background.
Drop an image here
or
You can also paste an image with Ctrl+V (⌘V on a Mac).
Your images stay on your device. Nothing is uploaded.
How to convert an image to Base64
- Choose or drop an image.
- Pick the output: data URI, Base64 only, an HTML <img> tag or a CSS background.
- Select “Copy to clipboard” and paste it into your code, or download it as a text file.
Private by design
Most online image tools upload your pictures to their servers. This one doesn’t: Image to Base64 runs entirely in your browser, so family photos, IDs, screenshots and client work never leave your device. It’s free, with no watermark and no limit on how many images you process, and you don’t need an account.
Questions
When should I use Base64 images?
For small images like icons, logos and email signatures, where avoiding a separate file matters. For large photos it's usually worse: the text is a third bigger than the file and can't be cached on its own.
Is the image re-compressed?
No. The file's exact bytes are encoded, so the image is identical.
Why is the Base64 bigger than my image?
Base64 writes every 3 bytes as 4 text characters, so the text is about 33% larger than the file. Compress the image first to keep it small.
Are my images uploaded?
No. Every tool runs in your web browser, so your images are read, changed and saved on your own device and never sent to LabAnvil or anyone else. Once the page has loaded, the tools even work offline.
Is it free? Do I need an account?
Free, with no watermark, no daily limit, no account and no cap on file size beyond what your device's memory can handle.
Part of Image Tools
12 free image tools that run in your browser: convert HEIC, WebP and PNG, compress, resize, crop and remove photo metadata without uploading anything.
A little guidance
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