Why this tool is useful
Recover a PNG, JPEG, GIF, WebP or BMP attachment from a Base64 field without submitting the encoded data to a server.
Developer & Data · runs locally
Base64 to Image Decoder
Decode a bounded Base64 or image data URL into a verified raster image locally and download the resulting file.
Ready. Your working data stays in this browser.
How it works
The browser decodes at most 20 MiB, checks the leading file signature and only then creates a temporary local preview and download.
Practical example
Paste a Base64-encoded one-pixel PNG to verify its signature and download the exact decoded bytes.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.