Base45 Encoder / Decoder
About this Tool
AllThatConverter's Base45 encoder and decoder converts data to and from Base45 format — the encoding standard used in EU Digital COVID Certificates — for free online. Base45 is optimized for QR codes, using only alphanumeric characters and a few symbols. All processing runs locally in your browser with no uploads. Base45 is more efficient than Base64 when encoding data into QR codes. No registration required, completely free.
Processed safely on your device
Everything happens in your browser on this device. Your files are never sent to our servers—so you can use it with peace of mind.
How to Use
Paste the text you want to encode or decode into the input area.
Click 'Encode' or 'Decode' to run the conversion.
The result appears instantly in the output area.
Click 'Copy' to copy the result to your clipboard.
Key Scenarios & Use Cases
QR Code Data Embedding
Base45 is optimized for QR code alphanumeric mode, fitting more data into fewer QR modules than Base64.
Digital Certificates and Health Passes
EU Digital COVID Certificates use Base45 encoding. Decode the Base45 portion of such QR codes here.
Compact Data Encoding
Base45's smaller output size makes it ideal for physical media such as QR codes or printed documents with limited space.
RFC 9285 System Interoperability
Verify and convert Base45 data for systems conforming to the RFC 9285 standard.
Frequently Asked Questions (FAQ)
Base45 uses 0–9, A–Z (uppercase), and the symbols space, $, %, *, +, -, ., /, : — a total of 45 characters, matching QR code alphanumeric mode.
Base45 is more efficient for QR-code encoding because it uses the QR alphanumeric character set, producing shorter QR codes. Base64 is more general-purpose for web, email, and database use.
No. All conversion runs locally inside your browser. Nothing is transmitted externally.
EU Digital COVID Certificate QR codes contain Base45-encoded CBOR data. This tool decodes the Base45 layer; a separate CBOR parser is needed to interpret the inner payload.