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Base64 to File Decoder🔒 100% local
Decode Base64 strings to files. Privacy-first, no server uploads.
Related Tools
Decodes a Base64 string and prints the plain text back in the page. The decode is atob() followed by the legacy escape()/decodeURIComponent() pairing, which is how multi-byte UTF-8 survives the round trip; a string with characters outside the Base64 alphabet stops with the message Invalid Base64 rather than producing partial output.
How to use it
- Paste the Base64 text into the input box. Trailing = padding is accepted either way.
- Press Process.
- Copy the decoded text out of the output box, or press Clear to start over.
Worked example
SGVsbG8sIFdvcmxkIQ==becomesHello, World!Computed in Node with atob() plus the same escape/decodeURIComponent pass the tool uses.
SGFwcHkgYmlydGhkYXkhbecomesHappy birthday!Unpadded input still decodes because its length is already a multiple of 4.
When to use it
- Reading a value out of a log line, a Kubernetes secret or an Authorization header you already have in front of you.
- Checking what an opaque config value holds before you paste it into a build script.
- Decoding the payload segment of a JWT without opening a site that stores what you paste.
What it does not do
- The slug says file decoder, but this variant prints text only. There is no download and no binary reassembly, so a Base64 PNG or PDF comes back as garbled characters instead of a usable file.
- It keeps the deprecated escape() path rather than TextDecoder, so behaviour depends on how the browser still handles that legacy function.
- Some browsers reject embedded whitespace inside atob(), and the wrapper reports only Invalid Base64 with no indication of which character was at fault.
- Base64 is an encoding, not a security measure: decoding proves nothing and hides nothing.