Does this Base64 tool upload my input?

No. Text and small file conversion happen locally in your browser.

Does the tool support UTF-8 text?

Yes. Text is encoded and decoded with UTF-8 rather than ASCII-only conversion.

Encoding Utility

Base64 Encoder / Decoder

Q: What is URL-safe Base64?

URL-safe Base64 replaces plus and slash characters with hyphen and underscore, and can remove padding for URL contexts.

Encode UTF-8 text to Base64, decode Base64 back to readable text, switch to URL-safe output, and convert small local files without uploading content.

Input

URL-safe Base64

Small file to Base64

Output

Base64 examples and workflows

Use this Base64 encoder and decoder for UTF-8 strings, URL-safe payloads, JWT-style segments, and small local files.

How to use this tool

Paste text or Base64 into the input box.
Choose encode or decode and toggle URL-safe output if needed.
Copy the output, or convert a small local file to Base64.

Real examples

Encode hello world into aGVsbG8gd29ybGQ=.
Encode UTF-8 text such as café without losing characters.
Decode a JWT-style header or payload segment locally before formatting the JSON.

Common use cases

Prepare small strings for config, tests, or API examples.
Inspect encoded payloads without uploading them.
Convert a small local file into a copyable data string for a fixture.

Sample input/output

Input: hello world.
Standard Base64: aGVsbG8gd29ybGQ=.
URL-safe mode: replaces + and /, and trims padding when needed.

Common errors and fixes

Invalid Base64: remove copied labels, quotes, or unsupported characters.
Unreadable decoded text: the payload may be binary data, not UTF-8 text.
JWT confusion: Base64 decoding does not verify a token signature.

Edge cases table

Case	What to check
URL-safe Base64	Uses `-` and `_` instead of `+` and `/`.
Missing padding	Some systems omit trailing `=`; this tool pads before decoding.
Binary files	File conversion can output Base64, but decode-to-text only works for valid UTF-8.

Edge cases / errors

Decode mode requires valid Base64 input.
Very large files are better handled by dedicated local tools.
Do not treat decoded JWT text as verified authentication data.

Related workflow

Decode a payload, then inspect the JSON with JSON Formatter / Validator.
Encode decoded query pieces with URL Encoder / Decoder.
Add IDs to encoded test fixtures with UUID Generator.

Useful browser-local tools for data encoding and developer fixtures.

URL Encoder / Decoder

Encode and decode URL components and query strings.

UUID Generator

Generate random v4 UUIDs locally.

Timestamp Converter

Convert Unix timestamps and dates.

CSV to JSON Converter

Turn CSV rows into JSON locally.