Ascii85 Encoder / Decoder
About this Tool
AllThatConverter's ASCII85 encoder and decoder is a free online tool that converts text or binary data to and from ASCII85 (Base85) format — the same encoding used in Adobe PostScript and PDF files. All processing runs entirely in your browser with no server uploads, keeping sensitive data private. ASCII85 produces roughly 20% more compact output than Base64, making it ideal for efficient data transfer. 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 or data 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
PDF and PostScript Optimization
Encode binary data within PDF or PostScript files using ASCII85 to reduce file size while maintaining text-stream compatibility.
Efficient Data Transfer
ASCII85 output is around 20% smaller than Base64, saving bandwidth for data-heavy transmission scenarios.
Development and Debugging
Inspect and verify binary-to-ASCII encoding in development scenarios where binary data must be embedded as ASCII text.
Legacy System Compatibility
Accurately convert data for exchange with legacy systems and print software that natively support the ASCII85 encoding scheme.
Frequently Asked Questions (FAQ)
ASCII85 (Base85) produces roughly 20% more compact output than Base64 by mapping 4 bytes into 5 ASCII characters, compared to Base64's 6-bit grouping. It is commonly used in PDF and PostScript.
No. All conversion runs locally in your browser. Your data never leaves your device.
All modern browsers — Chrome, Firefox, Safari, and Edge — are supported. No plugins or installs required.
There is no hard limit; very large inputs depend on your browser's available memory. Files up to a few MB work without issue.