— tool guide

Base64 Encoder/Decoder

Encode any text or binary data to Base64 and decode Base64 strings back to readable text. Supports URL-safe Base64, live character count, and file upload encoding.

Open Base64 Encoder/Decoder → free, no sign-in

— try it live open full screen ↗

— what it is

Base64 is a way to represent arbitrary binary data as printable ASCII characters — essential for embedding data in HTML, CSS, JSON, email headers, and JWT tokens. This tool encodes plain text or uploaded files to Base64 and decodes Base64 strings back to text or downloadable files, all in your browser with no server involvement.

— what it does

✓Encode text to standard or URL-safe Base64
✓Decode Base64 back to plain text or binary
✓Upload a file and get its Base64 representation
✓URL-safe mode replaces + with - and / with _ for use in URLs
✓Live character and byte count for input and output
✓One-click copy of the encoded or decoded result
✓Detects and warns when input is not valid Base64

— who it's for

→Developers encoding data for use in HTTP headers or API payloads
→Anyone working with JWT tokens who needs to inspect the payload
→Web developers embedding small files as data URIs
→Security professionals examining encoded credentials or cookies

— how to use it

01 Open the Base64 Encoder/Decoder

02 Choose Encode or Decode at the top

03 Paste your text or upload a file

04 Toggle URL-safe mode if needed for use in URLs or JWT

05 Copy the result with one click

— at a glance

Category	Dev Tools
Cost	Free
Sign-in required	No
Files uploaded	Never — runs in your browser
Published	May 11, 2026

— frequently asked questions

What is Base64 used for?

Base64 is used anywhere binary data needs to be stored or transmitted as text — JWT tokens, data URIs, MIME email attachments, HTTP Basic Auth headers, and more.

What is URL-safe Base64?

Standard Base64 uses + and / which have special meaning in URLs. URL-safe Base64 replaces them with - and _ so the encoded string can be used in URLs without percent-encoding.

Can I encode a file?

Yes — upload any file and the tool encodes it to Base64. This is the same process used to create data URIs for images.

Is Base64 encryption?

No — Base64 is encoding, not encryption. Anyone can decode a Base64 string without a key. Never use it to hide sensitive data.

Is this free?

Yes — free with no sign-in.

— ready to use it?

Free, instant, no sign-in required. Opens directly in your browser.

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