Base64 Encoder Decoder — Encode & Decode Base64 Online Free
Encode text and files to Base64, decode with image preview, standard and URL-safe modes — all in your browser.
Also searched as: base64 converter · encode to base64 · decode from base64 · text to base64 · url safe base64
How to Use
Step-by-step guide to get the most from this tool
- 1
Choose mode
Select Encode or Decode, and standard or URL-safe variant.
- 2
Enter or upload
Type text or upload a file to encode.
- 3
Review output
See encoded/decoded result with size stats.
- 4
Preview images
Decoded image Base64 shows an inline preview automatically.
Features
What makes this tool stand out
File encode
Convert files to Base64 strings.
Image preview
Inline preview for image data.
URL-safe mode
Base64 for URLs and headers.
Swap
Quick encode/decode toggle.
Size stats
Input/output length and ratio.
Private
Browser-only processing.
Related Tools
More free utilities you might find useful
Frequently Asked Questions
Quick answers to common questions
What is Base64?+
Base64 encodes binary data as ASCII text using 64 printable characters — common in HTTP, email, and JSON.
Can I encode a file?+
Yes. Click Encode file to convert any file to Base64. Images show an inline preview when decoded.
What is URL-safe Base64?+
Replaces + with - and / with _ so encoded strings work in URLs without extra encoding.
Does Base64 encrypt data?+
No. Base64 is encoding only — anyone can decode it. Use encryption for security.
Why does output end with ==?+
Padding makes length a multiple of 4. Some systems omit padding.
Can I decode images?+
Yes. Paste image Base64 or encode an image file to see an inline preview.
What is the Swap button?+
Moves output to input and toggles encode/decode mode for quick round-trips.
Is my data private?+
Yes. All encoding runs locally in your browser.