File to Base64 Converter
Drop a file in and get Base64 out — no upload, since the file is read locally in your browser. Pick the flavour you need: raw Base64, a ready-to-paste data: URL, or URL-safe Base64 for tokens and URLs. Large files are encoded on a background thread.
Processed as you paste — no button to press (Ctrl+Enter converts now / Esc clears)
Drop a file here, or — Ctrl+V a screenshot works too
Any file type · 100 MB maximum
Paste, drag and drop, or Ctrl+V a screenshot
When you need file to Base64
- Embedding assets in HTML or CSS — inline a small image so the page needs one fewer request
- JSON APIs — many upload endpoints expect the file body as a Base64 string field
- Emails and templates — attachments as text survive systems that strip binary
- Tokens and signatures — with the URL-safe alphabet so
+and/do not break URLs
Three output formats
Just the encoded characters — what most APIs and databases expect.
Prefix included, so the string works directly as a src in HTML or CSS.
- _ instead of + /, no padding, optional 76-character lines for MIME.
Frequently asked questions
How much bigger does the encoded output get?
Base64 adds about 33 percent: every 3 bytes become 4 characters. A 1 MB file produces roughly 1.37 MB of text, so keep per-file size in mind when inlining assets.
Can I convert several files at once?
Drop multiple files into the panel and each one is encoded separately, with its own copy button — convenient for pasting results into an API payload or a config file.