As of this year, the market has consolidated. Here are the top three tools that match the keyword "SWF decompiler online new."

Aconvert.com (simple asset extraction). Best for coders: OnlineSWFDecompiler.com (AS3 script viewing). Best for security: JPEXS Online Demo (open source, client-side).

Newer iterations and updates of these tools focus on compatibility with modern systems and the extraction of high-quality assets:

Works on Windows 7 through Windows 11 and macOS. 3. Sothink SWF Decompiler