Base64url Encode Online
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. No download or account is required: the tool loads in under a second and works offline-friendly after the first visit.
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.
- No download or account is required: the tool loads in under a second and works offline-friendly after the first visit.
Examples
subjects?_d=1&x=~y
Use cases
- Encode text to URL-safe Base64 using - and _ instead of + and /, with optional padding.
- Because everything is computed client-side, Base64url Encoder is safe to use with sensitive data such as API keys, tokens or private logs.
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.
Runs 100% in your browser — your data never leaves your device.