Encode Base64 without leaving the browser. Base64 Encoder encodes and decodes Base64 for both text and files — useful when you need to convert text or a file into a Base64 string that is safe to embed between two other steps of a debugging session. Everything runs inside your browser, so the file never touches a server, which matters when the payload contains tokens, customer records or anything else you would not paste into an unknown server.
How to
Four steps, no account, nothing to install.
Encode raw input, or decode an existing Base64 string.
Paste text or drop a file.
Copy the string, or download the decoded file.
Overview
Base64 is not compression or encryption — it is a transport trick. Three bytes of binary become four ASCII characters, so any file can travel safely through channels that only tolerate text: JSON payloads, data URIs, email attachments and HTTP headers.
Choose a direction — Encode raw input, or decode an existing Base64 string. Provide the input — Paste text or drop a file. Take the result — Copy the string, or download the decoded file. The whole loop is designed to be repeatable: change the input, read the new result, no re-submit step in between.
The failures people hit are predictable: Grows payload size by about 33%; Offers zero security; Unreadable to humans. Each of those shows up as a specific, fixable symptom rather than a vague error, which is exactly what this tool surfaces.
Inline images as data URIs, Binary fields in JSON APIs, Email (MIME) attachments — these are the contexts where Base64 shows up, and this page is the fast path between "I have a blob of input" and "I understand what it contains". Keep the tab open next to your editor and your terminal.
Features
Text and file modes
URL-safe alphabet option
Instant round-trip both ways
Download decoded binary output
Reference
| Property | Value |
|---|---|
| Format | Base64 binary-to-text encoding |
| Extension | .txt |
| MIME type | text/plain |
| Human readable | No |
| Typical use | Inline images as data URIs |
Examples
Copy the raw payload out of the network tab, drop it in here, and read the result immediately — no curl round trip, no scratch file.
Paste the snippet from the diff to confirm what it evaluates to before approving the change.
Because processing is local, real payloads with real identifiers can be inspected without violating a data-handling policy.
Benefits
FAQ
1. Choose a direction: Encode raw input, or decode an existing Base64 string. 2. Provide the input: Paste text or drop a file. 3. Take the result: Copy the string, or download the decoded file.
No. Everything runs inside your browser, so the file never touches a server — safe for tokens, staging payloads and customer data.
Yes, with no account, no rate limit and no paid tier.
An encoding that represents binary data using 64 printable ASCII characters. Three bytes of binary become four ASCII characters, so any file can travel safely through channels that only tolerate text: JSON payloads, data URIs, email attachments and HTTP headers.
Grows payload size by about 33%; Offers zero security; Unreadable to humans.
Once the page has loaded, yes — the processing needs no network access.
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