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Base64 Encoder and Decoder - Private Browser Tool

Encode text to Base64 or decode Base64 back to text without sending it to a server. Normal tool input is processed locally in your browser. Nothing is uploaded to a backend for normal tool usage.

Private browser processing No login Copy and download File API support

What is this tool?

Base64 Encoder / Decoder helps you encode text to Base64 or decode Base64 back to text without sending it to a server.

Does it upload data?

No. For normal usage, pasted input and selected local files are processed in your browser, not sent to a server for processing.

Best for

Developers, QA testers, analysts, students, support teams, and technical writers who need a quick private encoding tools workflow.

Important limitation: Base64 is reversible encoding, not encryption. Do not use it to protect private values.
Private by design. Tool input stays in the browser. No online save or share-result feature is included. Verify no upload.
Private workspaceNormal tool input is processed locally in your browser.Input size: 29 BVerify no upload
Tool options
Drop a local file hereRead by your browser with the File API. Nothing uploads to a server.

How to use this Base64 Encoder / Decoder

  1. Paste your input into the editor, or load a local file if the tool supports it.
  2. Choose any available options for the result you want.
  3. Click Run Base64 Tool to process the data in your browser.
  4. Review the output, then copy or download the result.

Base64 Encoder / Decoder example

Before:

Hello

After:

SGVsbG8=

What this tool does

Base64 Encoder and Decoder converts text to Base64 and decodes Base64 back to readable text with Unicode support.

Use it for API examples, data URLs, basic payload inspection, test strings, and URL-safe Base64 workflows.

Base64 is reversible encoding, not encryption. It should not be used to protect secrets.

Encoding and decoding run locally in your browser for normal tool usage.

When to use Base64 Encoder / Decoder

  • Decode tokens, Base64 values, hashes, or URL-encoded strings.
  • Prepare encoded values for API testing and debugging.
  • Inspect claims and encoded values without uploading sensitive text.

Limitations and safe-use notes

  • Base64 is encoding, not encryption. Anyone can decode Base64 text.
  • Do not treat Base64 output as a secure way to hide passwords, tokens, or private values.
  • Very large inputs depend on your browser memory, CPU, and device performance.
  • The tool is designed for developer workflows, examples, configs, exports, and debugging, not for replacing security-critical internal systems.
  • Avoid pasting production passwords, private API keys, medical records, financial records, or regulated customer data unless your policy allows it.

Common mistakes and warnings

  • Base64 is encoding, not encryption.
  • URL-safe Base64 uses different characters and may remove padding.
  • Malformed Base64 should be rejected with a clear message.

Privacy and browser processing

This page is static and the tool runtime runs on your device. Heavy work is sent to a browser Web Worker where possible. Local file loading uses the File API, generated downloads use Blob URLs, and no online save or share-result feature is included because that would weaken the privacy promise.

For normal tool usage, your pasted text or loaded file content is not sent to a server by this tool. This makes the page safer for formatting, converting, validating, or inspecting developer data that you do not want to upload elsewhere.

You can check this yourself by opening your browser developer tools, using the Network tab, and watching requests while processing sample input. See the verify no upload guide for step-by-step instructions.

Processing model Browser-side JavaScript
Account needed No
Download method Blob URL
Last updated 2026-06-11

Frequently asked questions

Is my text or Base64 input uploaded to a server?

No. Base64 Encoder and Decoder runs locally in your browser for normal tool usage. The static website files are downloaded by the browser, but your pasted input and selected local files are not uploaded to a backend for processing.

Is Base64 encryption?

No. Base64 is reversible encoding. Anyone with the encoded value can decode it.

What is URL-safe Base64?

URL-safe Base64 replaces characters that can be awkward in URLs and may omit padding depending on the format.

Can Base64 decode binary files?

This tool is focused on text workflows. Binary-file support may need a dedicated file-based workflow.

Can I copy or download the result?

Yes. After a result is generated, you can copy it to the clipboard or download it as a local file using browser APIs.

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