If you have a snippet of code from a tax response and need to see what it says, follow these steps: 1. Identify the Format
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
To keep a human-readable record of what was actually sent versus what is in your accounting software. sii decrypt online
You can import SII XML files directly into Excel, which handles the "decryption" and flattening of data automatically.
Once you have the XML text, it might still be hard to read. Use an to indent the tags. This will allow you to clearly see the IDFactura , ImporteTotal , and CuotaRepercutida fields. Security Warning: Protect Your Tax Data If you have a snippet of code from
Most modern accounting software has a "View Log" feature that shows the decoded response from the Tax Agency.
"Decrypting" these files online usually refers to one of two things: ), it is
Your SII files contain sensitive business information, including: Tax Identification Numbers (NIF/CIF). Client and provider names. Total invoice amounts and bank details.
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.
If you are building an API connection, you need to see the raw request to ensure the headers match AEAT requirements. Better Alternatives to Online Tools
