🔒 100% Private — Files Never Leave Your Device

Image to Base64

Encode PNG, JPG, WebP, GIF, SVG, and more to Base64 — full data URL or raw string only. Copy per file or download a ZIP of .txt exports. All local; no upload.

✓ Unlimited files ✓ No size limit ✓ Works offline ✓ No watermarks
📁
Drop images here or click to browse
PNG, JPG, WebP, GIF, SVG, and more — as many as you want
Output format

What is Base64 for images?

Base64 encodes binary data (your image bytes) as a text string using only letters, numbers, and a few symbols. That lets you embed small images inline in HTML, CSS, JSON, or email-like payloads without a separate file fetch. It is not encryption — anyone can decode Base64 back to bytes — so do not use it to hide secrets.

A Data URL wraps that string in a prefix such as data:image/png;base64, so the browser knows the MIME type. Many tutorials show Data URLs for quick prototypes; for production sites, normal file URLs plus caching usually perform better than giant inline strings.

How this tool encodes your images

The page uses the Web FileReader API with readAsDataURL, which reads each image file only on your machine. For raw mode, everything after the first comma is kept — the pure Base64 payload without the data:…;base64, header.

  1. Choose output: Data URL (full string) or Raw Base64 only.
  2. Add images (any format your browser accepts as image/*).
  3. Copy from each row or Download All as ZIP — each file becomes a .txt containing the string.

To reduce string length before encoding, shrink file size with our image compressor or fewer pixels via the image resizer.

Data URL vs raw Base64

When to use data URL versus raw Base64
Mode Best for
Data URLPasting into src="…" or url() in HTML/CSS for tiny assets, quick tests
Raw Base64JSON APIs, databases, or server fields that expect only the payload

Base64 adds roughly 33% overhead versus raw binary — expect larger “strings” than your original file size in bytes.

Copy button and secure context

The Copy button uses navigator.clipboard.writeText when the browser allows it, with a legacy fallback. On some browsers, clipboard access requires a secure context (HTTPS or localhost). If copy fails, select the full textarea and copy manually — the full string is always visible.

Who uses image Base64 encoders?

  • Front-end developers testing inline images or email templates.
  • API integrators sending image payloads as Base64 in JSON.
  • Designers grabbing a quick Data URL for a small icon in a CodePen-style demo.

For choosing image formats on real websites (WebP, AVIF, SVG), read best image format for websites.

Frequently Asked Questions

Is the image to Base64 tool free and unlimited?

Yes. Encode as many images as you need with no signup, watermarks, or quotas. Processing uses your browser only.

Are my images uploaded to your servers?

No. The FileReader API reads each file entirely on your device. Base64 text is generated locally; nothing is sent to DoItSwift.

What is the difference between Data URL and raw Base64?

A Data URL is the full string starting with data:image/type;base64, followed by the encoded bytes — ready to paste into HTML or CSS src attributes. Raw mode returns only the Base64 payload after the comma, which many APIs and JSON fields expect.

How do I copy the encoded string?

Use the Copy button on each row. The tool uses the Clipboard API when available, with a fallback for older browsers. You can also select the textarea manually.

Why does clipboard copy fail sometimes?

Some browsers only expose the Clipboard API on secure origins (HTTPS or localhost). If copy fails, select the text in the box and use your system copy command.

Are large images a problem?

Base64 expands file size by roughly 33%. Very large images produce very long strings, which can slow the page or stress memory — prefer smaller sources or compress images first.

Can I encode many images at once?

Yes. Drop or select multiple images; each gets its own textarea and Copy button. Download All as ZIP saves each string as a .txt file.

How do I switch between Data URL and raw mode for the same files?

Select the output format radio option before adding files. To regenerate with a different mode, use Clear All and drop the images again with the other option selected.

Does it work offline or on mobile?

After the page loads, encoding works offline. Mobile browsers generally support FileReader; very large batches may be slower on phones.

Is there a monthly limit or account required?

No accounts, no quotas, and no premium tier.

Related tools

Related guides