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15 tools · One toolkit

The toolkit.

Every tool here runs entirely in your browser. No upload, no signup. Your decoder inputs never leave the page. Pick a category to find what you need.

100% client-side 50 MB file support Open license-free Mobile-friendly
Decoders

Read what’s inside.

↓
Base64 Decoder
The main tool. Live mode, 50+ character sets, URL-safe handling, line-by-line decoding, hex output.
⌖
JWT Decoder
Inspect any JSON Web Token: header, payload claims, signature, expiration. Syntax-highlighted output.
⌬
PEM Parser
Extract every PEM block (cert, key, CSR) and view the raw DER bytes as a hex dump.
✦
Smart Detect
Paste anything — JWT, PEM, hex, URL-encoded, Base64 — and we'll identify it and route you to the right tool.
Encoders

Turn anything into Base64.

↑
Base64 Encoder
Encode text or paste content. Standard, URL-safe, no-padding, or MIME-wrapped output.
⌗
Image → Base64
Drop a PNG, JPG, SVG, GIF, WebP, or BMP. Get Base64 or a ready-to-paste data URI.
⏎
PDF → Base64
Encode a PDF for JSON API payloads, email attachments, or HTML data URIs.
▤
File → Base64
Encode any file — document, archive, audio, video — up to 50 MB.
⌬
Random Base64
Generate cryptographically-secure random strings. Session tokens, CSRF tokens, encryption keys.
Format-specific decoders

Convert to a specific format.

▣
Base64 → Image
Generic image decoder. Auto-detects PNG, JPG, GIF, WebP, BMP, SVG from the magic bytes.
P
Base64 → PNG
Decode and download as .png. For PNG-specific Base64 strings.
J
Base64 → JPG
Decode and download as .jpg. Verifies JPEG magic bytes.
S
Base64 → SVG
Decode SVG vector graphics, render inline, download or copy as data URI.
⏷
Base64 → PDF
Decode PDFs from API responses. Open in a new tab or download as .pdf.
Utilities

Build, validate, and learn.

⊞
Basic Auth Builder
Generate an Authorization: Basic … header from username and password. Includes a cURL one-liner.
✓
Base64 Validator
Big yes/no verdict on whether a string is valid Base64. Permissive or strict mode.
≡
Sample Library
12 hand-picked Base64 examples for testing: text, JWTs, data URIs, PEM blocks, padding edge cases.
⚙
How It Works
Step-by-step walkthrough of what happens between paste and result. The full decode pipeline.

One toolkit, one philosophy.

Every tool follows the same three rules — privacy, polish, precision. Your decoder inputs never leave your browser, and there's no AI guessing what you meant. Just fast, accurate, beautifully-designed utilities for working with encoded data.

01

100% client-side

Every encode and decode operation runs in your browser via plain JavaScript. Network tab is silent — nothing leaves the page. Verify it yourself with DevTools.

02

Designed to be used

Keyboard shortcuts, dark mode, shareable URLs, drag-and-drop, live preview. The same toolkit feels good on a desktop with Cmd+Enter and on a phone with a thumb.

03

Built to last

Plain HTML, CSS, and JavaScript. No frameworks to break, no build step to fail, no dependencies to update. You could host it on a floppy disk in 2035 and it would still work.