Base64 decoder

World's simplest base64 tool

This online program converts base64 data back to human-readable data. It supports regular base64 and chunked base64 (that's split into several lines). It can also decode multiple individual base64 values at once when the multi-line decoding mode is turned on in the options. Created by encoding gurus from team Browserling.

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Base64 decoder options

Multi-line Decoding

Decode Lines Individually Use this option if each line of the input has been encoded separately.

If the input is chunked base64, then you must add an extra empty line between the individual base64 data segments.

What is a base64 decoder?

learn more about this tool

This application works in your browser and it decodes the input base64 data. The input data can be presented in three ways: it can be a long base64 string on a single line, it can be chunked base64 on multiple lines (usually each line is 76 characters long), or it can be multiple independent base64 values on multiple lines. The data in base64 format uses Latin alphabet letters (a-z and A-Z), digits (0-9), symbols "+" and "/", and the padding character "=". Each base-64 character contains 6 bits of information. When all characters are joined together they form a binary sequence with every 8 bits representing a byte of the original human-readable data. Depending on how you count, base-64 uses 25% or 33% more space than the original data. If you enable the "Decode Lines Individually" option, then each input line will be decoded independently from other lines. Base64abulous!

Base64 decoder examples

Click to use

Single-line Base-64

In this example, the input is a single-line base-64 string. Unless you live on a planet where base-64 is the native language, the encoded data is an unreadable sequence of characters. The program easily decodes the input base-64 sequence and forms a human-readable text quote. The conversion is done by taking every 4 input base-64 symbols and using the base-64 lookup table, finding the 3 regular characters that they represent.

TGlmZSBpcyBhIHJvbGxlciBjb2FzdGVyLg==

Life is a roller coaster.

Required options

These options will be used automatically if you select this example.

Decode Lines Individually Use this option if each line of the input has been encoded separately.

Decode Lines Separately

In this example, each line of the input was encoded separately and we want to quickly decode all of them at once. To get it done, we enable the parallel processing option, which splits the input into lines and calls the base-64 decode function on all lines at once. It turns out that the short encoded data are cardinal directions.

Tm9ydGg= RWFzdA== U291dGg= V2VzdA==

North East South West

Required options

These options will be used automatically if you select this example.

Decode Lines Individually Use this option if each line of the input has been encoded separately.

Chunked Multi-line Base-64

The input base-64 in this example consists of three separately encoded data pieces, which have also been chunkified into constant-length fragments. To separate the chunkified fragments from individual base-64 segments, an empty line is inserted between them. The program applies the multi-line decoding mode to all segments and returns three unique Unicode emojis.

VGhlIFN1 biDimIA= VGhlIE1v b24g4pi+ VGhlIFRy dXRoIOKY rw==

The Sun ☀ The Moon ☾ The Truth ☯

Required options

These options will be used automatically if you select this example.

Decode Lines Individually Use this option if each line of the input has been encoded separately.

Pro tips Master online base64 tools

You can pass input to this tool via ?input query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!

https://onlinebase64tools.com/base64-decode?input=TGlmZSBpcyBhIHJvbGxlciBjb2FzdGVyLg%3D%3D&multi-line=false

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Split Base64 Into Chunks

Quickly split base64 data into multiple lines.

Join Base64 Chunks

Quickly merge multi-line base64 chunks into a single line.

Encode Data to Base64

Quickly convert data to base64 encoding.

Decode Base64 Data

Quickly convert data from base64 to regular data.

Create Random Base64

Quickly generate valid random base64 data for testing.

Validate Base64

Quickly check if the input data is valid base64.

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Print Base64 Statistics

Analyze base64-encoded data and print information about it.

Create Errors in Base64 Data

Introduce random errors in the given base64-encoded data.

Encode Data to Base26

Convert data to base26 encoding.

Decode Base26 Data

Convert base26-encoded data to regular data.

Convert Base64 to Base26

Convert data in base-64 encoding to base-26 encoding.

Convert Base26 to Base64

Convert data in base-26 encoding to base-64 encoding.

Generate Random Base26 Data

Create valid random base26-encoded data.

Encode Data to Base32

Convert data to base32 encoding.

Decode Base32 Data

Convert base32-encoded data to regular data.

Convert Base64 to Base32

Convert base-64 data to base-32 data.

Convert Base32 to Base64

Convert base-32 data to base-64 data.

Generate Random Base32 Data

Create valid random base32-encoded data.

Encode Data to Base36

Convert data to base36 encoding.

Decode Base36 Data

Convert base36-encoded data to regular data.

Convert Base64 to Base36

Convert base-64 encoded data to base-36 encoded data.

Convert Base36 to Base64

Convert base-36 encoded data to base-64 encoded data.

Generate Random Base36 Data

Create valid random base36-encoded data.

Encode Data to Base45

Convert data to base45 encoding.

Decode Base45 Data

Convert base45-encoded data to regular data.

Convert Base64 to Base45

Convert base-64 encoded data to base-45 encoded data.

Convert Base45 to Base64

Convert base-45 encoded data to base-64 encoded data.

Generate Random Base45 Data

Create valid random base45-encoded data.

Encode Data to Base46

Convert data to base46 encoding.

Decode Base46 Data

Convert base46-encoded data to regular data.

Convert Base64 to Base46

Convert base-64 encoded data to base-46 encoded data.

Convert Base46 to Base64

Convert base-46 encoded data to base-64 encoded data.

Generate Random Base46 Data

Create valid random base46-encoded data.

Encode Data to Base58

Convert data to base58 encoding.

Decode Base58 Data

Convert base58-encoded data to regular data.

Convert Base64 to Base58

Convert data in base-64 encoding to data in base-58 encoding.

Convert Base58 to Base64

Convert data encoded in base-58 to data encoded in base-64.

Generate Random Base58 Data

Create valid random base58-encoded data.

Encode Data to Base62

Convert data to base62 encoding.

Decode Base62 Data

Convert base62-encoded data to regular data.

Convert Base64 to Base62

Convert base-64 data to base-62 data.

Convert Base62 to Base64

Convert base-62 data to base-64 data.

Generate Random Base62 Data

Create valid random base62-encoded data.

Encode Data to Ascii85

Convert data to Ascii85 encoding.

Decode Ascii85 Data

Convert ascii85-encoded data to regular data.

Convert Base64 to Ascii85

Convert base-64 encoding to Ascii-85 encoding.

Convert Ascii85 to Base64

Convert Ascii-85 encoding to base-64 encoding.

Generate Random Ascii85 Data

Create valid random ascii85-encoded data.

Convert Base64 to Uuencoding

Convert base-64 data to uuencoded data.

Convert Uuencoding to Base64

Convert uuencoded data to base-64 encoded data.

Convert Base64 to Xxencoding

Convert base-64 data to xxencoded data.

Convert Xxencoding to Base64

Convert xxencoded data to base-64 encoded data.

Convert Base64 to Binary

Convert base-64 data to binary data.

Convert Binary to Base64

Convert binary data to base-64 data.

Convert Base64 to Octal

Convert base-64 encoding to octal base.

Convert Octal to Base64

Convert octal base to base-64 encoding.

Convert Base64 to Decimal

Convert base-64 encoded data to decimal numbers.

Convert Decimal to Base64

Convert decimal numbers to base-64 encoded data.

Convert Base64 to Hex

Convert base-64 data to hexadecimal base.

Convert Hex to Base64

Convert hexadecimal base to base-64 data.

Convert Base64 to File

Convert base-64 data to a downloadable file.

Convert File to Base64

Convert any file to base-64 data.

Replace Base64 Alphabet

Swap one base64 index table with another.

Remove Base64 Padding

Remove padding from the end of base64 data.

Add Base64 Padding

Append extra padding to base64 data.

Compress Base64 Data

Use a more compact base64 representation.

ROT13-encode Base64

Apply ROT13 encryption algorithm on base64 data.

ROT13-decode Base64

Decrypt previously ROT-13 encoded base64 data.

ROT32-encode Base64

Apply ROT32 encryption algorithm on base64 data.

ROT32-decode Base64

Decrypt previously ROT-32 encoded base64 data.

ROT47-encode Base64

Apply ROT47 encryption algorithm on base64 data.

ROT47-decode Base64

Decrypt previously ROT-47 encoded base64 data.

Btoa-encode Data

Encode data using the original btoa program.

Btoa-decode Data

Decode previously encoded btoa-data (run atob program).

Obfuscate Base64

Obfuscate base64 data by adding fake delimiters.

Generate Fake Base64

Create real-looking base64 data that is fake.

Generate Symmetric Base64

Create base64 data that is a palindrome.

Glitch Base64

Add glitches to base64-encoded data.

Destroy Base64

Let Zalgo destroy base64-encoded data.

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We're Browserling — a friendly and fun cross-browser testing company powered by alien technology. At Browserling our mission is to make developers' lives easier, so we created this collection of online base64 tools. Unlike many other tools, we made our tools free, without ads, and with the simplest possible user interface. Our online base64 are actually powered by our programming tools that we created over the last couple of years. Check them out!

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All conversions and calculations are done in your browser using JavaScript. We don't send a single bit about your input data to our servers. There is no server-side processing at all. We use Google Analytics and StatCounter for site usage analytics. Your IP address is saved on our web server, but it's not associated with any personally identifiable information. We don't use cookies and don't store session information in cookies. We use your browser's local storage to save tools' input. It stays on your computer.

By using Online Base64 Tools you agree to our Terms of Service. TLDR: You don't need an account to use our tools. All tools are free of charge and you can use them as much as you want. You can't do illegal or shady things with our tools. We may block your access to tools, if we find out you're doing something bad. We're not liable for your actions and we offer no warranty. We may revise our terms at any time.