# Base64 to File Converter

> Decode Base64, a data URI or hex back into a downloadable file, with the type detected automatically.

This decodes Base64, Base64url, a data URI or hexadecimal back into the original file. The type is taken from the data URI header when present, and otherwise identified from the decoded bytes' magic number — so a PNG, PDF or ZIP is recognised even from a bare Base64 string with no filename.

**URL:** https://convertto.tech/t/base64-to-file
**Category:** Encoders & Decoders (https://convertto.tech/c/encoding-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Detects:** 24 file signatures including PNG, JPEG, PDF, ZIP, DOCX, XLSX, MP4, WOFF2 and SQLite
- **Accepts:** Data URIs, raw Base64, Base64url and hexadecimal
- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Enter or paste your base64, data uri or hex.
2. Choose the input is.
3. Enter or paste your file name.
4. Enter or paste your mime type override.
5. Press Run, then download the result when it is ready.

## FAQ

### How does it know what kind of file this is?

From the decoded bytes. Almost every binary format begins with a fixed signature — PNG starts with 89 50 4E 47, PDF with %PDF, ZIP with PK. The tool matches those, and refines ZIP further to spot DOCX, XLSX and EPUB by looking inside.

### Why does my Base64 fail to decode?

Usually a truncated paste or wrapped text that included a prefix. Base64 must contain only A-Z, a-z, 0-9, plus and slash, with optional trailing equals padding — anything else means part of the string is missing or extra.

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- [File Type Identifier](https://convertto.tech/t/file-type-identifier): Identify any file from its magic bytes, and see whether the extension is telling the truth.
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