Browser 106

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Inspector security/base64-decode

Base64 Decoderen

Overview

Base64 Decode turns a Base64 string back into the text it was made from. The two panes are linked: paste the encoded string on one side and the readable text appears on the other, edit that text and the new encoding appears next to it — so you can check a change without re-encoding by hand. Both alphabets are handled: standard, and the URL-safe variant that uses - and _ in place of + and /. Decoding is strict, so a malformed string or one that mixes the two alphabets is refused rather than turned into plausible-looking wrong bytes, and the decoded bytes are read as UTF-8 so non-Latin scripts and emoji come back intact. Everything runs in your browser, which is what makes it reasonable to paste a secret from a manifest or a token from a log.

Reading a JWT PayloadPaste the middle segment of a token, choose the URL-safe alphabet, and read the JSON claims — no library, and no key needed to see what a token says.
Kubernetes and CI SecretsValues in a Secret manifest or a CI variable are stored as Base64. Decode one here to confirm what it actually holds, without echoing it into a shell history.
Debugging an Encoded Config ValueA setting arrives Base64-wrapped from a deployment pipeline; decode it to see whether the problem is the value itself or the wrapping around it.
Catching an Inconsistent EncoderA string that mixes + and _ is refused rather than decoded to wrong bytes — which is often the fastest way to find the service that is encoding inconsistently.
Editing and Re-encodingChange the decoded text in its pane and read the new Base64 beside it, instead of decoding, editing and encoding again in three separate steps.

Set

Beveiligingstools 26

Neighbours

01 AES Bestand & Tekst Encryptor 02 Base64 Coderen 03 CSR Generator 04 DER naar PEM Converter 05 Hash Generator 06 JWT Ondertekenen

Specification

Command: security.base64_decode
Set: Security
Input: text
Output: —
Max. bestand: no limit
Batch: single file

Runtime

Engine: WebCrypto · OpenPGP.js
Threads: single
Isolated: —
WebGPU: —
Memory: —

Transport 0 B

The file is opened, worked on and written back inside this tab. No upload step exists in this tool — there is nowhere for the bytes to go.

Keys

Zoeken: ⌘K
Panels: ⌘1 · ⌘2
Full width: F
All keys: ⌘/

How it works

Paste the encoded string

Base64 on one side, the decoded text on the other. Editing either pane updates the other, so you can change the decoded text and read the new encoding without leaving the page.

Pick the alphabet it was written in

Standard Base64, or the URL-safe alphabet that uses - and _ in place of + and /. Unicode comes back intact, emoji included.

Copy the result

Both panes stay on screen, so you can read the round trip before you copy. The conversion runs in your browser; nothing is uploaded.

Frequently asked

How do I know if text is Base64 encoded?

Base64 uses only letters, digits, + and / (or - and _ in the URL-safe alphabet), sometimes with one or two = at the end as padding. It looks like a long run of random characters with no spaces. The surest test is to decode it: if the result is readable text or a recognisable structure, it was.

Is the decoding process secure?

Decoding happens in your browser. The string you paste and the text that comes out are not sent to a server and are not stored, which matters when the encoded value is a secret from a manifest or a token from a log.

What happens if the Base64 is invalid?

You get an error rather than plausible-looking wrong bytes. A string that mixes the two alphabets — some + or / alongside some - or _ — is refused as well, instead of being quietly normalised: mixed input came from something inconsistent, and guessing which alphabet was meant would decode to the wrong bytes silently.

Does Unicode come back intact?

Yes. The decoded bytes are read as UTF-8, so accented letters, non-Latin scripts and emoji return exactly as they went in, rather than as the mangled characters a Latin-1 decoder produces.

Keys

Zoeken: ⌘K
Panels: ⌘1 · ⌘2
Full width: F
All keys: ⌘/

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