Can I convert an image or file to Base64?

Yes. Switch the data type to File / Image and drop any file. You get plain Base64 or a data URI (data:image/png;base64,…) that you can paste straight into HTML, CSS or JSON.

Can I decode Base64 back into a file?

Yes. In Decode mode choose File / Image: the tool sniffs the media type from the decoded bytes, shows a preview for images and offers a download with the correct extension.

What is URL-safe Base64?

A variant that replaces + and / with - and _ and usually omits padding. It is used in JWTs and URL parameters. The decoder recognises it automatically.

What are Base32 and Base58?

Base32 (RFC 4648) uses A–Z and 2–7, is case-insensitive and appears in TOTP secrets and file names. Base58 drops 0, O, I and l to avoid confusion and is used for Bitcoin addresses and IPFS CIDs.

Is Base64 encryption?

No. Base64 is encoding, not encryption — anyone can decode it instantly. Never use it to protect sensitive data.

Is my file uploaded anywhere?

No. Files are read with the browser FileReader API and converted locally. Nothing leaves your machine.

Base64 Encode / Decode

Convert between raw data and Base64 in either direction. Encode plain text, hex bytes, or drop any file (images, PDFs, fonts, archives up to 10 MB) to Base64 or a ready-to-paste data URI. Decoding auto-detects the standard and URL-safe alphabets, repairs missing padding, strips whitespace and data: prefixes, sniffs the media type from magic bytes, previews images, and downloads the result with the right extension. Also handles Base32 (RFC 4648) and Base58 (Bitcoin), MIME 76-column wrapping, and per-line batch conversion. Everything runs in your browser.

Runs locally in your browser

from

Drop a file or paste a large blob — open fullscreen for long output

Plain text

0 chars · 1 line

Base64 output

Output will appear here…

Alphabet

Include = paddingPer-line batch (one value per line)

Wrap at 76 chars (MIME)

Standard Base64 as used in MIME, JSON payloads and data URIs.

URL Encode / Decode

Percent-encode text with encodeURIComponent, encodeURI, form or RFC 3986 rules, decode multi-layer strings, and edit query strings in a table.

Image Converter & Base64

Convert, resize and compress images to PNG, JPEG, WebP or AVIF and encode or decode Base64 data URIs.

HTML Entity Encode / Decode

Encode text to HTML entities with presets (minimal, attribute-safe, all non-ASCII) and decode all 2,000+ HTML5 named references.

Hash Generator

MD5, SHA-1, SHA-256/384/512, SHA-3, CRC32 and xxHash32 for text, lines and files — with verify and checksum export.

Text to Binary

Convert text or files to binary, hex, octal or decimal bytes and back, with a hex dump, per-character byte table and five encodings.

How to use Base64 Encode / Decode

1Pick Encode or Decode, then choose what the data is: Text, File / Image, or Hex.
2Paste text, drop a file onto the upload area, or paste a Base64 string (data: URIs and URL-safe input are detected automatically).
3Read the output as it updates — for files you get a data URI or plain Base64; for decoded files you get a preview, the sniffed media type, and a Download button.
4Open Options to switch alphabet (Base64, URL-safe, Base32, Base58), toggle padding, wrap at 76 columns for MIME, or turn on per-line batch mode.
5Use Swap (⌘⇧S) to feed the output back in the other direction, and ⌘Enter to run immediately.

About Base64 Encode / Decode

Base64 Encode / Decode is part of FizzKit — a collection of focused developer and ad-tech tools. Because everything runs locally, it works offline once loaded and never exposes your data to a remote server.

Frequently asked questions

Base64 encodes binary data as ASCII text so it can travel through text-only channels — e-mail, JSON payloads, data URIs, HTTP headers and so on. It grows the data by about a third.

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