64 Base64Toolkit
Language:

File to Base64

Convert any file — certificates, keystores, PDFs, binaries — to a Base64 string, entirely in your browser.

Drop any file here, or click to browse

Nothing is uploaded — encoding happens on your device

Why encode files as Base64?

Any time a binary file has to travel through a text-only channel, Base64 is the answer: storing signing keystores and TLS certificates in CI/CD secret variables, embedding attachments in JSON or XML API payloads, putting binary data into Kubernetes Secrets or ConfigMaps, and building MIME email attachments. This tool reads the file with the browser FileReader API and encodes it locally, so even sensitive files like private keys never leave your machine.

To reverse the process — turn a Base64 string back into a downloadable file — use Base64 to File.

Frequently Asked Questions

›How do I convert a file to Base64?

Drag any file onto the drop zone (or click to browse). The Base64 string is generated locally and shown instantly — copy it or download it as a .txt file.

›Why do CI/CD pipelines store files as Base64?

Secret stores (GitHub Actions secrets, GitLab CI variables, Vault, AWS SSM) accept text, not binary. Encoding a keystore, service-account JSON, or .p12 certificate as Base64 lets you store it as a plain string and decode it back to a file during the pipeline run, e.g. echo "$CERT_B64" | base64 -d > cert.p12.

›Is there a file size limit?

Only your browser's memory. Files up to a few hundred MB work fine on typical machines. Since nothing is uploaded, conversion speed does not depend on your internet connection.

Related Tools

Base64 Encode Text to Base64, live Base64 Decode Base64 back to text Base64URL Encode URL-safe RFC 4648 Image to Base64 Data URIs for HTML/CSS Base64 to Image Preview & download Base64 to File Rebuild & download files Base64 to Hex Inspect raw bytes Hex to Base64 Hex strings to Base64 Kubernetes Secret Decoder Decode secret YAML JWT Decoder Inspect token claims