How to use: Base64url Encoder
Base64url Encoder is a free online Encoding Tools tool that encode text to URL-safe Base64 using - and _ instead of + and /, with optional padding instantly in your browser. Paste your data, adjust the options and get the result in real time — no installation, no sign-up, and nothing is ever uploaded to a server.
Description
Encode text to URL-safe Base64 using - and _ instead of + and /, with optional padding.
- Encoding Tools
- Because everything is computed client-side, Base64url Encoder is safe to use with sensitive data such as API keys, tokens or private logs.
How to use
Using Base64url Encoder takes three steps:
- Paste your data into the input box (or load the example).
- Configure the options to match your target format or scenario.
- Copy, download or inspect the output — it updates live as you type.
Run
Examples
Characters that standard Base64 would turn into + and / stay URL-safe here.
Input
subjects?_d=1&x=~y
Output
c3ViamVjdHM_X2Q9MSZ4PX55
This output was produced by actually running the tool, not written by hand.
Use cases
Common situations where Base64url Encoder helps:
- Encode text to URL-safe Base64 using - and _ instead of + and /, with optional padding.
Parameters
| key | Options | type | allowed | default | Base64url Encoder |
|---|---|---|---|---|---|
dir | Direction | select | enc (Encode text → Base64url), dec (Decode Base64url → text), pad (Encode with padding) | — | enc |
Input: text · Output: text · live update while typing: ✓
FAQ
What is Base64url Encoder?
Base64url Encoder encode text to URL-safe Base64 using - and _ instead of + and /, with optional padding. It runs entirely in your browser, so your data stays private.
Is Base64url Encoder free to use?
Yes. Base64url Encoder is free, unlimited and works without registration or installation.
Does my data get uploaded?
No. All processing happens locally in your browser; nothing is sent to any server.
Good to know
- Everything runs client-side, so extremely large inputs are limited by your browser tab’s memory rather than by a server upload limit.