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Decode Base64 online, free
Encode text and files to Base64 or Data URLs, or decode Base64 strings to UTF-8 plaintext with Base64URL mode support.
- Runs in your browser — no upload
- Free, no sign-up, no watermark
Set up on this page
- Operation Mode: decode
How to use Base64 Encoder & Decoder · Base64 Encoder & Decoder — frequently asked questions
How to use Decode Base64
- 1
Add your file
Drop a file on the page or click Select Files.
- 2
Check the preset
Operation Mode is set to decode. You can change it before running.
- 3
Run the tool
Press start. Processing happens on your device.
- 4
Save the result
The result is delivered as TXT.
What Base64 Encoder & Decoder can do
- Operation Mode: encode and decode
- Private by design — files are processed in your browser and never uploaded
- Free with no sign-up, no watermark and no daily limit
Base64 Encoder & Decoder — frequently asked questions
What does this page set for Decode Base64?
Operation Mode: decode. All of these stay editable.
Is my file uploaded?
No. On the web this tool runs in your browser, so your file is not uploaded.
Are there limits?
It takes one input per run. Server jobs accept up to 0 GB. A job can run for up to 10 seconds. In the browser, the practical limit is your device's memory.
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format using 64 printable characters (A–Z, a–z, 0–9, +, and /).
What is Base64URL and when should I use it?
Base64URL replaces `+` with `-` and `/` with `_`, and omits trailing `=` padding characters. It is safe for use in URL query parameters, filenames, and JSON Web Tokens (JWTs).
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