Base64/Hex File Encoder & Decoder
Convert files to Base64 or Hex strings and decode encoded text back to downloadable files with private browser-only processing.
Convert files to Base64 or Hex strings and decode encoded text back into downloadable files, entirely in your browser with no server uploads.
Encode File to Text
Decode Text to File
Bidirectional Conversion
Convert binary files into Base64 or Hex text and decode Base64/Hex content back to downloadable files with filename and MIME controls.
Strict Input Validation
Detect malformed Base64 and invalid Hex input with clear errors for empty content, non-hex characters, and odd-length byte sequences.
Immediate File Reconstruction
Decode text into a file blob instantly and download it in one click, including support for custom output names and MIME type metadata.
Private Browser-Only Processing
Encoding and decoding run locally in your browser. Files and encoded payloads are not uploaded to remote services.
API Payload Preparation
Convert binary files into Base64 strings for JSON payloads, test fixtures, and request-body workflows in backend integrations.
Incident Forensics
Decode suspicious Base64 or Hex blobs from logs and tickets into local files for controlled offline analysis and debugging.
Data Migration
Move assets between systems that expect text-safe transport by switching files to Base64 or Hex and reconstructing them at destination.
Protocol Testing
Validate binary serialization behavior by encoding files to Hex for packet inspection and decoding sample payloads back to byte-identical files.
Client-Side Tooling
Build frontend workflows that require local conversion to Base64 or Hex without external libraries or API dependencies.
Education and Debug Labs
Demonstrate how binary bytes map to textual encodings and test malformed input handling in classroom or onboarding environments.
Base64/Hex File Encoder & Decoder is a local browser utility for converting binary files into text-safe encodings and converting encoded text back into downloadable binary content.
What It Solves
Many APIs, logs, and transport layers require textual payloads rather than raw bytes. This tool helps you encode files into Base64 or Hex and decode those strings back into practical files without backend services.
Accuracy and Validation
Decoding includes strict validation for malformed Base64 and invalid Hex characters or byte-length issues, reducing silent corruption and making troubleshooting faster.
Privacy
All conversion operations run in-browser. File content and encoded strings remain on your device unless you choose to copy or export them.
Related Tools
RSA/ECDSA Key Generator
Generate cryptographically secure RSA and ECDSA public/private key pairs using the Web Crypto API - Free online key generator
Cryptographically Secure Password Generator
Generate high-entropy passwords with browser cryptographic randomness and policy controls - Free secure password generator
UUID / GUID Batch Generator
Generate batches of up to 10,000 cryptographically secure UUID v4 (random) or UUID v7 (time-ordered) identifiers in your browser - Free online UUID generator
AES File Encryptor/Decryptor
Encrypt and decrypt files locally using AES-256-GCM with PBKDF2 passphrase-based key derivation - Free online AES file encryptor
Frequently Asked Questions About Base64/Hex File Encoder & Decoder
Base64 is more compact and commonly used in JSON/API payloads, while Hex is easier to inspect byte-by-byte. Both represent binary data as text.
Yes. The decoder accepts plain Base64 and data URL prefixes like data:image/png;base64,... and reconstructs the binary file output.
Hex bytes require exactly two characters per byte. If the length is odd, one half-byte is missing and the data cannot be decoded safely.
Yes. You can set both output filename and MIME type before decoding, then download the reconstructed file with those settings.
No. Encoding and decoding happen locally in your browser. This tool does not send your files or encoded content to external services.
There is no account or usage quota in the tool workflow. Practical limits depend on your browser memory and device capacity for very large files.