File Base64

Quick answer: Encode small files as Base64 for inlining and transport. Open 文件 Base64 — everything runs locally in your browser, and files never leave your device.

Steps

1. Upload the file to the File Base64 tool.
2. Copy the raw encoding or full data URI.
3. Paste into the target environment.

Important notes

• Designed for small files (configs, icons); large files inflate by a third and eat memory.
• The data URI's MIME prefix is auto-generated from the file type.

Common questions

Size limit? Comfortable under ~10 MB in-browser.

Decode back? Yes — paste into decode mode and download.

When to use this

When the target system rejects data URIs, strip the prefix and send the bare encoding — most APIs want one or the other, not both.

Pro tips

Base64 work has two failure patterns worth knowing: wrong MIME prefix (data:image/png but the file is actually WebP) breaks strict parsers, and line-wrapping — some tools emit Base64 with line breaks every 76 characters per the old MIME standard, which JSON APIs reject. When an API rejects your encoding, first strip whitespace, then check the prefix against the real file type (the File Hash tool or a hex view confirms). For anything over a few megabytes, use file upload instead of inlining — Base64 inflates payload by a third and some servers reject large request bodies outright.

Can I embed a PDF as Base64? Yes, with data:application/pdf;base64 — but browsers render linked PDFs better than data-URI ones, so use inlining only for small documents.