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Base64 Decoder — Decode strings & data URLs to text or files

Paste a Base64 string or data: URL and decode it instantly in your browser. Preview decoded text, extract files (images, fonts), download the result or copy decoded text with one click — all processed client-side for privacy.

Open decoder Open dashboard

• Decode Base64 & data: URLs to readable text
• Extract and download binary files (PNG, JPG, PDF, fonts)
• One-click copy decoded text or save file
• Client-side processing — keep data local

What this decoder reports

The decoder accepts plain Base64 strings or full data: URLs and attempts to decode them. Depending on the payload it will:

• Text payloads: show decoded UTF-8 text, with a Copy button and raw preview.
• Binary payloads (images, PDFs, fonts): detect MIME type from data URL or heuristics and offer a download link and preview where possible.
• Data URLs: parse the media type and parameters and provide a ready-to-download file.
• Error handling: validate input and show helpful errors (invalid Base64, unexpected binary sequence).

Quick example

Input

SGVsbG8sIHdvcmxkIQ==

Decoded output

Hello, world!

Tip: paste a data URL like data:image/png;base64,iVBORw0... to extract and download the image.

Features & benefits

Client-side decoding: inputs are decoded in your browser by default, protecting privacy.
Auto-detect MIME type: data URL parsing extracts media type and parameters for correct downloads.
Download files: convert base64 binary into downloadable Blob objects (images, PDFs, fonts, etc.).
Copy & export: one-click copy decoded text or export files and save decoding history (dashboard users).
Validation & errors: clear messages for invalid base64 or unsupported payloads.

How to decode — quick steps

1. Paste Base64 or data URL

Paste your Base64 string (optionally a full data: URL) into the input area.

2. Click Decode

The tool decodes and detects whether the payload is text or binary, then shows a preview.

3. Copy or download

Copy decoded text or download the reconstructed file directly from the browser.

Who uses Base64 Decoder — examples

Support & QA

Ask customers to paste Base64 snippets from logs or copy-paste data URLs for faster troubleshooting.

Developers

Decode tokens, sample payloads or data URLs when debugging encoding issues.

Content editors

Extract images embedded as data URLs and save them as files for CMS uploads or editing.

Frequently asked questions

Can I decode files?

Yes — paste a data URL or Base64 representing a file. If a MIME type is present we offer a download and preview. For raw binary without MIME type, results may require manual inspection.

Is decoding safe?

Decoding is safe, but be cautious opening unknown files. We recommend previewing and scanning files before opening locally.

Where is the data processed?

By default decoding runs in your browser. Dashboard batch jobs may use server-side processing with consent.

Ready to decode?

Use the demo above to decode Base64 strings or data URLs. Sign up to save decoded outputs and export files.

Pricing

Free demo available. Premium plans include bulk decoding, saved history, team sharing and export of decoded files.

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