Base64 File Decoder🔒 100% local

Decode Base64 to downloadable files. Privacy-first, no server uploads.

Input

Base64 File Decoder: related tools

Base64 Converter Base64 to File Decoder Base64 Encoder

Decodes a Base64 string into readable text, treating the decoded bytes as UTF-8. You paste the string, press Process, and the characters appear in the box below; the decode is done in the page and the string is not saved or sent.

Base64 File Decoder: how to use it

Paste the Base64 string into the input box. The box arrives pre-filled with a short sample payload.
Press Process. Anything the decoder cannot parse comes back as Invalid Base64.
Use Copy Output to move the decoded text, or Clear to start again.

Base64 File Decoder: worked example

SGVsbG8sIFdvcmxkIQpUaGlzIGlzIHNhbXBsZSB0ZXh0IHRvIGVuY29kZS4=becomes

Hello, World!
This is sample text to encode.

The payload holds a newline, so the decoded output is two lines. This is the sample the box is pre-filled with.

8J+agA==becomes🚀

The bytes are decoded as UTF-8, so a four-byte emoji comes back as a single character rather than four odd ones.

not base64!!becomesInvalid Base64

One message covers every kind of bad input.

Base64 File Decoder: when to use it

A deployment log shows an encoded value and you want to know whether it is readable text before writing a parser for it.
Checking that a payload captured from an HTTP header or a queue message decodes to the JSON you expect.
Reading a small text blob out of a configuration value without opening a terminal.

Base64 File Decoder: what it does not do

Despite file in the name, this page returns text. There is no download button, no file name and no MIME detection; the Base64 Converter's decode tab is the one with a download path.
Binary payloads generally fail. An image or an archive decodes to bytes that are not valid UTF-8, and the whole result becomes the single message Invalid Base64.
Whitespace inside the string is tolerated, but nothing else is, and URL-safe Base64 using - or _ is rejected along with everything else.
The error never says where the problem is, so a long string has to be bisected by hand or checked with another tool.

📄Base64 File Decoder🔒 100% local