Image to Base64 Converter
Convert PNG, JPG, SVG, WEBP and GIF images to Base64 data URIs, raw Base64, HTML img tags, CSS backgrounds, Markdown or JSON. Batch convert and copy instantly – nothing is uploaded.
- Upload
- Options
- Download
- ✓ 100% free
- ✓ No sign-up
- ✓ No limits
- 🔒 Files never leave your device
How to: Image to Base64
- Upload one or more images.
- Choose the output format: data URI, raw Base64, HTML, CSS, Markdown or JSON.
- Copy each result or download all as a text file.
Embedding an image as Base64 puts the picture directly inside HTML, CSS, JSON or Markdown, so there is no separate file to host. Developers use it for small icons, email templates, test fixtures and API payloads. Drop in any number of images and get a ready-to-paste snippet for each, together with the size increase, so you can decide whether embedding makes sense.
Common uses
- Inline small icons and logos in CSS to save HTTP requests.
- Embed images in HTML email templates and single-file reports.
- Send images in JSON API requests or store them in configuration files.
- Create test fixtures and placeholders for unit tests.
Tips for best results
- Optimise or compress the image first – Base64 adds a third to its size.
- Prefer SVG for icons; it is often smaller even after encoding.
- Use the CSS output to embed backgrounds in stylesheets.
- Use raw Base64 when an API expects only the encoded data without the data: prefix.
Anatomy of a data URI
A data URI has three parts: the data: prefix, the MIME type such as image/png, and the Base64 text after ;base64,. Browsers treat it exactly like an image URL, so it can go anywhere a link to an image would – the src of an img tag, a CSS url() or a Markdown image. The MIME type comes from your file, so the browser knows how to decode it.
Batch conversion
Upload several images at once to convert a whole icon set. Each image gets its own copy button and preview, and the download contains all snippets separated by blank lines, ready for documentation or code reviews.
Safe for private assets
Encoding uses the browser's FileReader, so unreleased designs and internal screenshots never leave your machine.
Why use FreePDF for Image to Base64?
| FreePDF | Typical upload-based sites | |
|---|---|---|
| Files uploaded to a server | No – processed on your device | Yes |
| Sign-up required | Never | Often for bigger jobs |
| Hourly / daily task limits | None | Common on free plans |
| Watermark on output | Never | Sometimes |
| Works offline after loading | Yes, for most tools | No |
Frequently asked questions
Why is Base64 larger than the image
Base64 represents every 3 bytes of the file with 4 text characters, so the encoded text is about 33% larger than the original image. That is the trade-off for embedding images directly in code.
When should I avoid Base64 images
Large photos are better served as normal image files, which browsers can cache separately. Base64 works best for small icons, logos, email images and single-file HTML documents.
Is Image to Base64 really free?
Yes. Every tool on FreePDF is 100% free with no file limits, no sign-up and no watermarks. The site is supported by unobtrusive ads.
Are my files uploaded to a server?
No. FreePDF processes your files directly in your browser using JavaScript. Your documents never leave your device, so they stay completely private.
Does it work on mobile?
Yes. FreePDF works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux.