Open your file in a text editor (like Notepad). If you see a long string of random characters (e.g., PHhtbCB2ZXJzaW9u... ), it is . If you see a giant wall of text starting with , it is simply unformatted . 2. Use a Trusted Decoder To decode Base64 SII data: Copy the encoded string. Use a reputable Base64 to XML converter . Paste the code and hit "Decode." 3. Use an XML Formatter
Your SII files contain sensitive business information, including: Tax Identification Numbers (NIF/CIF). Client and provider names. Total invoice amounts and bank details. sii decrypt online
If you are a business owner or an accountant operating in Spain, you’ve likely encountered the system. While this real-time VAT reporting system is efficient, it often leaves users with encrypted or encoded XML files that are nearly impossible to read without technical help. Open your file in a text editor (like Notepad)
Instead of searching for "SII decrypt online" every time, consider these more professional approaches: If you see a giant wall of text
Turning scrambled text back into readable XML.
When the AEAT returns an "Accepted with Errors" status, the decrypted XML will tell you exactly which invoice line failed.