Online Base64 Decoder

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Base64 Decoder


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The “Base64 Decode Online” is a free decoder for decoding online Base64 to text or binary. In other words, it is a tool that converts Base64 to original data. This online decoder is as smart as it is simple. Its superpower is the ability to automatically detect the encoding standard. Thanks to it, this converter allows you to “decrypt” some Base64 strings, even while other online or offline decoders are powerless and cannot decode them, because they support only the “main” standard. If you are looking for the reverse process, check Base64 encode.

The term Base64 is coming from a certain MIME content transfer encoding. Basically, Base64 is a collection of related encoding designs which represent the binary information in ASCII format by converting it into a base64 representation.

Base64 encoding schemes are generally used when there is a need to encode binary information that needs to be stored and transferred over media that are developed to deal with textual information. This guarantees that the data stays unchanged without modification during transfer. Base64 is generally used in a number of applications including electronic mail via MIME, and keeping complex information in XML.

The specific set of characters chosen for the 64 characters needed for the base can vary among implementations. The common concept is to select a set of 64 characters that is both part of a subset typical to most encodings. This mixture leaves the data impossible to be altered in transportation thru information systems, such as electronic mail, that were typically not 8-bit clean. The Base64 implementation in MIME uses a-z, A-Z and 0-9 for the first 62 values. Other Base64 variations share the same property but they use different symbols in the last two values.

What is Base64 Encoding? How does Base64 encoding and decoding work?

Base64 encoding is a binary-to-text encoding/decoding scheme. The encoding process converts binary data to a printable ASCII string format. The decoding process converts the encoded string back to binary data.

About Base64Decoder

Base64Decoder.io is a simple and easy-to-use online tool to decode any Base64 encoded data back to binary data.

You can get started by typing or pasting any Base64 encoded data in the input textarea, the tool will automatically decode your input in real time.

If the input is not a valid Base64 encoded string, then the input text area will turn red and the output textarea will be cleared.

Once the input is decoded, you can click in the output textarea to copy the decoded data.

The website also contains several tutorials and articles about how to decode any Base64 encoded data in different programming languages like Java, Go, PHP, Python, and Javascript.

Base64 encoding and decoding

Base64 encoding is an algorithm to convert binary data into ASCII character set. The encoding is required to transmit binary data safely through communication media/protocols that are designed to handle only textual data.

Base64 is part of binary-to-text encryption types that represent binary numbers or data in Associate in Nursing ASCII string format by translating it into a radix-64 illustration. The term Base64 originates from a selected MIME content transfer encryption. every Base64 digit represents precisely six bits of information.

Base64 Decoder is a simple and free online tool that quickly and easily decodes your data to human-readable text.

What is Base64?

Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. The term Base64 originates from a specific MIME content transfer encoding.

The term Base64 is coming from a certain MIME content transfer encoding. Basically, Base64 is a collection of related encoding designs which represent the binary information in ASCII format by converting it into a base64 representation.

Base64 encoding schemes are generally used when there is a need to encode binary information that needs to be stored and transferred over media that are developed to deal with textual information. This guarantees that the data stays unchanged without modification during transfer. Base64 is generally used in a number of applications including electronic mail via MIME, and keeping complex information in XML.

The specific set of characters chosen for the 64 characters needed for the base can vary among implementations. The common concept is to select a set of 64 characters that is both part of a subset typical to most encodings. This mixture leaves the data impossible to be altered in transportation thru information systems, such as electronic mail, that were typically not 8-bit clean. The Base64 implementation in MIME uses a-z, A-Z and 0-9 for the first 62 values. Other Base64 variations share the same property but they use different symbols in the last two values.

How to decode Base64 online using this decoder tool

1. Paste your string in the “Base64” field.

2. Select the algorithm standard (if you do not know, leave it as it is, as the decoder will automatically detect it).

3. Enable the strict decoding mode if you want to make sure that your Base64 string contains only valid characters.

4. If you know what encoding the original data was in, select it in the “Character Encoding” list.

5. Press the “Decode Base64” button.

6. Download or copy the result from the “Text” field.

Standards accepted by online Base64 decode tool

To claim the title of “best Base64 decoder”, it supports the following standards:

1. Main (used by default by everyone and everywhere)

2. MIME (the output is splitted into fixed 76 line-length and is used to encode email content, such as files, or non-latin letters)

3. ASCII Armor (used by OpenPGP, is identical to the Base64 for MIME, but appends a checksum of input)

4. Base64URL (unlike other standards, the output of this standard can be safely used as a filename or URL)

5. IMAP (used by Internet Message Access Protocol as mailbox international naming convention)

6. PEM (a deprecated standard originally used by the Privacy-Enhanced Mail protocol)

7. xsd:NMTOKEN (provides safe strings to be used as valid XML Name Tokens)

8. xsd:Name (provides safe strings to be used as valid XML Identifiers)

Character encodings supported by Base64 decoder

Moreover, it can decode strings encoded using the following character encodings:

UTF-8, UTF-7, ASCII, ANSI_X3.4-1968, iso-ir-6, ANSI_X3.4-1986, ISO_646.irv:1991, US-ASCII, ISO646-US, us, IBM367, cp367, csASCII, EUC-JP, EUC, x-euc-jp, SJIS, x-sjis, SHIFT-JIS, eucJP-win, eucJP-open, eucJP-ms, SJIS-win, SJIS-open, SJIS-ms, CP932, MS932, Windows-31J, MS_Kanji, ISO-2022-JP, GB18030, gb-18030-2000, Windows-1252, cp1252, Windows-1254, CP1254, ISO-8859-1, latin1, ISO-8859-2, latin2, ISO-8859-3, latin3, ISO-8859-4, latin4, ISO-8859-5, cyrillic, ISO-8859-6, arabic, ISO-8859-7, greek, ISO-8859-8, hebrew, ISO-8859-9, latin5, ISO-8859-10, latin6, ISO-8859-13, ISO-8859-14, latin8, ISO-8859-15, ISO-8859-16, EUC-CN, CN-GB, x-euc-cn, gb2312, CP936, GBK, EUC-TW, x-euc-tw, BIG-5, CN-BIG5, BIG-FIVE, CP950, EUC-KR, x-euc-kr, UHC, CP949, Windows-1251, CP1251, CP866, IBM866, KOI8-R, KOI8-U, ArmSCII-8, CP850, IBM850

Base64 validator

Online Base64 decoder also validates if your Base64 encoded string is valid.

If your Base64 encoded string can not be decoded, the validator will show you an error message. Otherwise, if Base64 string is valid, you will see the decoded string in the result text field.

If you leave auto-decoding turned on, Base64 validator will validate the input string on every text change.

How to check whether a string is Base64 encoded or not?

Online Base64 decoder can tell you if your string is Base64 encoded by validating it.

If Base64 validation returns an error for your string, it is not Base64 encoded or encoding is not done properly.


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