Is there a size limit for Base64 encoding?

Base64 encoding expands file size by ~33%. A 1 MB image becomes ~1.37 MB as a Base64 string. For large files, the Base64 string can be very long — browser text areas handle up to 100 MB, but copying/pasting very large strings may slow down the browser.

Does Base64 encrypt my file?

No. Base64 is encoding, not encryption. Anyone with the Base64 string can decode it back to the original file. For encryption, use the Password-Protect tool in the Archive section.

Base64 Encode & Decode Files Free Online — Images, PDFs, Any File

What Is Base64 and Why Do You Need It?

Base64 is a text encoding of binary data. Email attachments, CSS background-image data URIs, JWT payloads, and API binary fields all use Base64. If you have a logo PNG you want to embed directly in a CSS file (no separate HTTP request), or an image you want to include in a JSON API payload, you need the Base64-encoded string.

Encode a File to Base64

Drag any file (image, PDF, font, binary) into the encoder. The Base64 string appears instantly. For images, you also get a ready-to-use data URI (data:image/png;base64,...) that you can paste directly into HTML src attributes or CSS background-image.

Decode Base64 Back to a File

Paste a Base64 string (or data URI) into the decoder. Click Decode. The original file downloads. This is useful for extracting images embedded in HTML source code, decoding API responses that return Base64-encoded binary content, or debugging JWT tokens that contain Base64-encoded claims.

Base64 Encode & Decode Files Free Online — Images, PDFs, Any File

What Is Base64 and Why Do You Need It?

Encode a File to Base64

Decode Base64 Back to a File

Frequently Asked Questions

Base64 encode files free

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