How to decode a Base64 string?

Isn’t encoding taking the text TO base64 and decoding taking base64 BACK to text? You seem be mixing them up here. When I decode using this online decoder I get:

BASE64: blahblah
UTF8: nVnV

not the other way around. I can’t reproduce it completely in PS though. See sample below:

PS > [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String("blahblah"))
nV�nV�

PS > [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes("nVnV"))
blZuVg==

EDIT I believe you’re using the wrong encoder for your text. The encoded base64 string is encoded from UTF8(or ASCII) string.

PS > [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String("YmxhaGJsYWg="))
blahblah

PS > [System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String("YmxhaGJsYWg="))
汢桡汢桡

PS > [System.Text.Encoding]::ASCII.GetString([System.Convert]::FromBase64String("YmxhaGJsYWg="))
blahblah

Related Posts:

  1. Connect-AzAccount – how to avoid azure device authentication?
  2. How do I concatenate strings and variables in PowerShell?
  3. PowerShell equivalent to grep -f
  4. Running a command as Administrator using PowerShell?
  5. Setting Windows PowerShell environment variables
  6. How do I concatenate strings and variables in PowerShell?
  7. Replace substring in PowerShell
  8. Echo equivalent in PowerShell for script testing
  9. Echo equivalent in PowerShell for script testing
  10. PowerShell says “execution of scripts is disabled on this system.”
  11. How to use the curl command in PowerShell?
  12. PowerShell and the -contains operator
  13. Change directory in PowerShell
  14. How to handle command-line arguments in PowerShell
  15. Splitting a string into separate variables
  16. How to split string by string in Powershell
  17. How to split string by string in Powershell
  18. How to export data to CSV in PowerShell?
  19. Downloading a file with PowerShell
  20. Terminating a script in PowerShell
  21. How to run an EXE file in PowerShell with parameters with spaces and quotes
  22. How to run an EXE file in PowerShell with parameters with spaces and quotes
  23. Terminating a script in PowerShell
  24. Prompt for user input in PowerShell
  25. How to upgrade PowerShell version from 2.0 to 3.0
  26. How do I concatenate strings and variables in PowerShell?
  27. Array.Add vs +=
  28. PowerShell and the -contains operator
  29. PowerShell string interpolation syntax
  30. How to write to the console in PowerShell?
  31. Function return value in PowerShell
  32. PowerShell ‘Or’ Statement
  33. powershell -Or operator not working
  34. Copy file remotely with PowerShell
  35. How to find the Windows version from the PowerShell command line
  36. Read file line by line in PowerShell
  37. Path to Powershell.exe (v 2.0)
  38. Azure Powershell Select-AzureSubscription with subscription id
  39. How to unzip a file in Powershell?
  40. You cannot call a method on a null-valued expression
  41. How can I replace every occurrence of a String in a file with PowerShell?
  42. Unix tail equivalent command in Windows Powershell
  43. Create directory if it does not exist
  44. Copy-Item is overwriting by default
  45. The term ‘Get-ADUser’ is not recognized as the name of a cmdlet
  46. How to print environment variables to the console in PowerShell?
  47. The term ‘nmake’ is not recognized
  48. Ternary operator in PowerShell
  49. Get-WmiObject : The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)
  50. Call PowerShell script PS1 from another PS1 script inside Powershell ISE
  51. Does PowerShell has something like “echo off” and “echo on” trigger?
  52. Convert a string to datetime in PowerShell
  53. LDAP query in PowerShell
  54. PowerShell: Comparing dates
  55. Press any key to continue
  56. accessing the $args array in powershell
  57. Create a function with optional call variables
  58. How do I do ‘dir /s /b’ in PowerShell?
  59. Create Log File in Powershell
  60. What does the & symbol in powershell mean?
  61. What does the double asterisks mean?
  62. How to enter a multi-line command
  63. How to break lines in PowerShell?
  64. How to tell PowerShell to wait for each command to end before starting the next?
  65. How to convert string to integer in PowerShell
  66. Powershell: GetType used in PowerShell, difference between variables
  67. One Powershell Script calling another with parameters
  68. Concatenate files using PowerShell
  69. Passing multiple values to a single PowerShell script parameter
  70. Upload files with FTP using PowerShell
  71. Powershell send-mailmessage – email to multiple recipients
  72. Sometimes PowerShell stops sending output until I press enter. Why?
  73. In a PowerShell script, how can I check if I’m running with administrator privileges?
  74. What is the literal escape character in Powershell?
  75. How can I convert MP3 file to a Base64 encoded string? [closed]
  76. PowerShell says “execution of scripts is disabled on this system.”
  77. How do you comment out code in PowerShell?
  78. How to use operator ‘-replace’ in PowerShell to replace strings of texts with special characters and replace successfully
  79. How to use _CRT_SECURE_NO_WARNINGS
  80. Check if a file exists or not in Windows PowerShell?
  81. How to run a PowerShell script
  82. How do I pass multiple parameters into a function in PowerShell?
  83. How can I pass an argument to a PowerShell script?
  84. Base64 encoding and decoding in client-side Javascript
  85. Invalid length for a Base-64 char array
  86. Why java unknown: import org.apache.commons.codec.binary.Base64;?
  87. Equivalent of *Nix ‘which’ command in PowerShell?
  88. Upload file to SFTP using PowerShell
  89. How to assign multiple lines string in Powershell Console
  90. How to run PowerShell in CMD
  91. How can I test that a variable is more than eight characters in PowerShell?
  92. How do I get the current username in Windows PowerShell?
  93. How to display Base64 images in HTML
  94. Difference between $? and $LastExitCode in PowerShell
  95. Install-Module : The term ‘Install-Module’ is not recognized as the name of a cmdlet
  96. Simple PowerShell LastWriteTime compare
  97. Get file version in PowerShell
  98. How to Resize a Bitmap in Android?
  99. How can I convert an image into Base64 string using JavaScript?
  100. How do I diff two text files in Windows Powershell?

Leave a Comment

techhipbettruvabetnorabahisbahis forumutaraftarium24eduseduseduedusedueduseduedusedusedus