What Base64 File does
Use this tool to inspect, download, or create Base64 file payloads for APIs, CSS data URIs, email attachments, and test fixtures.
Common uses
- Preview a Base64 image
- Create a Base64 payload from a local file
- Recover a file from an API response
Privacy and limitations
File bytes are read with the browser FileReader API and are never uploaded.
Always validate security-sensitive output in the authoritative application or platform.
Frequently asked questions
What file types are supported?
Any file can be encoded. Common image types can also be previewed.
How large can a file be?
The browser can handle many files, but Base64 increases size by roughly one third, so keep files reasonably small.