File to Base64
This encoder converts a file into a Base64 text string, the format used for data URIs, JSON payloads and email attachments. Developers use it to inline small assets or to test API requests.
Drag & drop files here
or Browse files
Max file size: 100 MB
Processed locally in your browser. Files are cleared when you leave the page.
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Why use File to Base64?
Small utility jobs — packaging files into an archive, generating a QR code, encoding data — usually send you to an unfamiliar website that wants an upload. Running them here keeps the task in your browser, takes a couple of seconds and leaves no copy behind.
How to use File to Base64
- 1Upload the file you want to encode.
- 2Press Convert now.
- 3The Base64 string appears in the results list.
- 4Copy the string, or download it as a text file.
Features
- Works with any file type, binary or text.
- Encoding is local, so credentials and keys are never transmitted.
- Output can be copied directly into code.
Supported formats
- Input
- Any file type
- Output
- Base64 text
Your privacy
This tool runs entirely in your browser using JavaScript and WebAssembly. The file you select is read into your device's memory, converted there and offered back as a download — it is never uploaded to our servers. Closing or reloading the page clears it. If you are signed in, we store only the tool name, the number of files and their total size so you can see your own activity history; the file contents are never sent.
Tips for the best result
- Give downloaded files a descriptive name so you can find them later.
- Test generated QR codes with a real phone camera before printing them.
- For archives, group related files first — the structure you select is the structure you get.
Frequently asked questions
Why is the Base64 string larger than the file?
Base64 represents three bytes with four characters, so the encoded text is roughly 33% larger than the original.
Is Base64 encryption?
No. It is an encoding, not a cipher — anyone can decode it. Never use it to protect secrets.
Can I decode a string back into a file?
Yes, use the Base64 to file tool.
Is my file uploaded?
No. The conversion runs in your browser with JavaScript and WebAssembly, so the file never leaves your device and nothing is uploaded to our servers.
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