Base64 to File
Decode Base64 strings or data URIs and download the binary file with MIME sniffing and a custom filename in your browser.
Decode Base64 or data URIs into downloadable files
API responses, email attachments, and inline data: URLs often ship binary payloads as
Base64. This decoder accepts raw Base64 or a full data URI, detects the MIME type from the URI
header or file magic bytes, and lets you save the bytes as a file, entirely in your browser.
When to use it
- Recover a PNG, PDF, or ZIP embedded in a JSON field.
- Turn a
data:image/png;base64,…snippet into an image file. - Inspect decoded size and effective MIME before downloading.
For text-only payloads, try Base64 Decoder or Base64 to CSS.
Frequently Asked Questions
Does this support URL-safe Base64?
Yes. Hyphens and underscores are normalized to standard Base64 before decoding, and missing padding is added when possible.
How is the MIME type chosen?
If the input is a data URI, its declared type is used unless it is generic octet-stream. Otherwise common file signatures (PNG, JPEG, PDF, GIF, ZIP, GZIP) are sniffed from the first bytes.
Is my data uploaded?
No. Decoding uses the Web APIs atob and Blob locally; nothing is sent to a server.
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