Embedding a small icon in CSS
Before
icon.png, 3 KB file
After
Base64 data URI, inline in CSS
Eliminated one HTTP request per icon. For small icons, this is a real performance win.
All Tools
Base64 Encoder / Decoder – Encode and Decode Instantly
I use Base64 mostly for debugging JWT tokens and embedding small images into CSS. This tool does both directions with one click, and it handles Unicode and emoji correctly — which a lot of online tools get wrong.
100% free, no signup
Plain text
Base64
Your files are processed in your browser and never uploaded to any server.
A note from me
One thing worth knowing: Base64 is not encryption. I've seen people encode passwords with it thinking it adds security — it doesn't. Anyone can decode it in one step. Use it for encoding data, not protecting it. For emoji and non-English text, this tool handles UTF-8 correctly, which most simple encoders don't.
— Mirza Noman Baig
How to use this tool
- 1Pick Encode or Decode mode.
- 2Paste your text or Base64 string.
- 3See the result instantly.
- 4Use Swap to flip the direction.
- 5Copy the output with one click.
Real results from testing
These are actual measurements from using this tool, not estimates.
Debugging a JWT token
Before
JWT header, unreadable
After
Decoded Base64, readable JSON
Confirmed the algorithm was RS256 as expected. This is my first step whenever a token acts weird.
Encoding non-English text
Before
Arabic text with diacritics
After
Base64 encoded, decoded back without any character loss
Many online tools mangle non-ASCII characters. This one handles UTF-8 correctly.
Base64 Encode / Decode features
Encode and decode
Both directions work with one click — no need for two separate tools.
Full Unicode support
Emojis, non-English scripts, and special characters are handled correctly.
Instant results
Output updates as you type. No button to press.
Runs locally
Data never leaves your browser. Safe for tokens and API keys.
Frequently asked questions
Is Base64 encryption?+
No. Base64 is encoding, not encryption. Anyone can decode it back to the original data. Never use it to protect passwords or secrets.
Does it support Unicode and emoji?+
Yes. Full UTF-8 support. Emojis, Arabic, Chinese — all handled correctly.
Is my data uploaded anywhere?+
No. Everything runs in your browser. Your data stays on your device.
Can I encode images to Base64?+
Yes, for small images. Large images produce huge Base64 strings that slow down your code.
What does Swap do?+
Switches the direction — Encode becomes Decode and vice versa, using the current output as the new input.