This free base64 encode decode tool converts text into Base64 and turns Base64 back into readable text, instantly in your browser. Developers use it every day for data URIs, email attachments, API tokens, and config values — paste your text below, choose encode or decode, and copy the clean result.
How to use the Base64 encoder and decoder
- Paste the text you want to convert into the input box (plain text for encoding, a Base64 string for decoding).
- Select Encode to turn text into Base64, or Decode to turn Base64 back into text.
- The converted result appears instantly in the output box.
- Check that the result looks right — decoded text should be readable, encoded text should contain only letters, numbers, `+`, `/` and `=` padding.
- Click copy and paste the result into your code, email setting, or file.
- Repeat as often as you need; there are no limits.
What is Base64 encoding?
Base64 is a way of representing data using only 64 safe characters: the letters A–Z and a–z, the digits 0–9, and the symbols `+` and `/`, with `=` used as padding at the end. Many systems — email, URLs, JSON, and HTML — were designed for text and can corrupt or reject raw binary data or special characters. Base64 solves that problem by translating any data into this safe text alphabet. Email attachments travel as Base64 inside MIME messages. Small images are embedded directly into web pages as Base64 data URIs. API keys and tokens are often Base64-encoded before being placed in request headers. The trade-off is size: Base64 output is roughly one-third larger than the original data, which is fine for small items but wasteful for large files.
Base64 encode and decode examples
Encoding is a one-way-looking but fully reversible translation. The word `Hello` becomes `SGVsbG8=`. The phrase `KhiyaleeGFX tools` becomes `S2hpeWFsZWVHRlggdG9vbHM=`. Decode either string with this tool and you get the exact original text back. Notice the pattern: every three characters of input become four characters of Base64, which is why a short text grows a little, and why encoded strings often end with one or two `=` signs — the padding that rounds the final group up to four characters.
A practical example is an image data URI. A tiny image can be written directly inside HTML as `data:image/png;base64,…` followed by its Base64 data. The browser reads the Base64, rebuilds the image, and no separate image file is needed. Developers also meet Base64 in JSON Web Tokens, where the header and payload sections are Base64URL-encoded — a close cousin that swaps `+` and `/` for `-` and `_` so the token is safe inside a URL.
Frequently asked questions about Base64
Is Base64 a form of encryption?
No. Base64 is encoding, not encryption. Anyone who has a Base64 string can decode it instantly with a tool like this one — there is no password or key. Never rely on Base64 to hide passwords or private data; use it only to transport data safely.
Why does my decoded text look like nonsense?
The input was probably not plain-text Base64, or a character was lost or changed while copying. Encoded binary data (like a photo) decodes into raw bytes that look like random symbols as text. Make sure you copy the complete string, including any `=` padding at the end.
What is the difference between encode and decode?
Encoding converts normal data into Base64. Decoding converts Base64 back into the original data. The process is perfectly reversible — encode then decode and you return to exactly what you started with.
Does this tool upload my data?
No. Encoding and decoding happen locally in your browser. Your text and tokens never leave your device, so the tool is safe for development work.
Working with data strings goes hand in hand with our JSON Formatter & Validator, the URL Encoder / Decoder, and the Image to Base64 converter for turning images into data URIs. Find every helper on the All Tools page or return to the KhiyaleeGFX homepage.
