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Base64 Encoder/Decoder

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Encode text or files to Base64, or decode Base64 back to text or an image preview — both directions on one page, with an optional URL-safe variant.

How it works

  1. Pick Encode or Decode, then type or paste your input
  2. The result updates instantly below — no separate site for the opposite direction
  3. Decoding a Base64 image (PNG/JPEG/GIF/WebP) shows an actual image preview instead of garbled text
  4. Switch to the File tab to turn any file into a Base64 data URI

Frequently asked questions

Is Base64 encryption?

No — it's just an encoding. Anyone can decode it, so don't use it to protect sensitive data.

Can I encode image files too?

Yes — switch to the File tab and upload any file to get a data URI you can paste directly into HTML or CSS.

Can I convert Base64 to an image and see it?

Yes — paste Base64 image data (PNG, JPEG, GIF, or WebP) into Decode mode and a real image preview appears above the output, detected from the file's binary signature, not just guessed from the text.

What is URL-safe Base64 for?

Standard Base64 uses + and / characters, which cause problems inside URLs. URL-safe Base64 replaces them with - and _ instead.

Why do I get an error when decoding?

The input isn't valid Base64 — check for missing characters, extra whitespace, or turn on the URL-safe toggle if the string uses - and _ instead of + and /.

#Base64Encode#Base64Decode#Base64ToImage#Base64FileEncoder

Related tools

URL Encoder/Decoder URL Encoder/Decoder HTML Entity Encoder/Decoder HTML Entity Encoder/Decoder

From the blog

Base64 encode and decode are usually two different websites. We put them on one page.
dev

Base64 encode and decode are usually two different websites. We put them on one page.

The most common Base64 tools split encoding and decoding across separate sites, run ads above the result, and fail silently on image data. Ours does both directions, previews decoded images, and stays ad-free.

2026-08-28

Update history

  • 2026-08-30 Added: a cover image — used as the card thumbnail, social share image, and blog title image.
  • 2026-08-29 Fixed: Embed button now works (it silently did nothing before — Astro module scripts made document.currentScript unreliable) and the generated iframe snippet points at the correct /embed/{category}/{slug} URL instead of a 404. Removed: "API" share button — it linked to /api/v1/{slug}, which doesn't exist on this static site and always 404'd. Will return once a real API is built.
  • 2026-08-28 Added: image preview when decoding Base64 image data (PNG/JPEG/GIF/WebP), detected by binary signature instead of failing as invalid text.
  • 2026-08-28 Launched: two-way Base64 text/file encoder-decoder with URL-safe toggle, one page instead of separate encode/decode sites.