Base85 Encoder / Decoder
Encode text to Base85 (Ascii85) and decode it back — more compact than Base64. Runs entirely in your browser.
How to use Base85 Encoder / Decoder: Open Base85 Encoder / Decoder — it runs entirely in your browser with no setup. Paste or type your input into the text area, or upload a file where supported. Set any options you need. The result appears in the output panel — there is no upload step and no waiting on a server. Everything runs inside your browser, so your data never leaves your device.
Tip: drag a text file onto the box above to load it — drop several to append them in order.
Encoded
Encode text to Base85 (Ascii85) and decode it back — more compact than Base64. Runs entirely in your browser. Base85 Encoder / Decoder is a free, browser-based tool in the Filevane developer tools collection — there is nothing to install, no account to create and no watermark on your results. It works on desktop, tablet and mobile, and because the work happens on your own device it stays fast even with large inputs.
How to use Base85 Encoder / Decoder
- Open Base85 Encoder / Decoder — it runs entirely in your browser with no setup.
- Paste or type your input into the text area, or upload a file where supported.
- Set any options you need. The result appears in the output panel — there is no upload step and no waiting on a server.
- Review the output instantly; large inputs are handled locally without lag.
- Copy the result to your clipboard or download it. Your data never leaves the page.
Why use Base85 Encoder / Decoder?
- 100% free with no limits, no sign-up and no watermarks.
- Private by design — your data are processed in your browser and never uploaded to a server.
- Fast and lightweight, with instant results even on a phone or a slow connection.
- Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
- Part of a full developer tools suite, so related base85 encoder tasks are one click away.
Is it private and secure?
Your privacy is built in. Base85 Encoder / Decoder runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.
Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.
You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.
Learn more
Is It Safe to Paste Production Data Into Online Tools? — JWTs, API responses and env files get pasted into online formatters every day. Here's what actually happens to that data and how to check before you paste.
Frequently asked questions
What is Base85 and when is it worth using?
Base85 encodes four bytes as five printable characters, giving about 25% size overhead compared with Base64's 33%. It is used inside PDF files (ASCII85 filters), in PostScript, and in ZeroMQ's Z85 variant for binary data in config files.
What is the difference between ASCII85 and Z85?
Different alphabets for different hazards. ASCII85 uses characters including quotes and backslashes that need escaping in source code and JSON; Z85 was designed specifically to avoid those, so a Z85 string can be embedded in code without escaping.
Why is Base85 not used on the web?
Its alphabet includes characters that are unsafe in URLs, HTML and JSON without escaping — which usually cancels out the size saving. Base64 remains the safer default for anything travelling over HTTP.
What does the 'z' shortcut mean in ASCII85?
Four consecutive zero bytes are encoded as the single character z instead of five characters. It makes ASCII85 noticeably more compact on data containing runs of zeros, which is common in the image streams inside PDFs.
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