Decode Base64 strings and pretty-print JSON data — paste encoded text to see the decoded result instantly. Everything runs locally in your browser — nothing is uploaded.
Encodes text or small files into Base64 strings and decodes them back with automatic MIME-type detection for binary safety. Everything runs locally in your browser — nothing is uploaded.
Escape or unescape JSON strings — convert special characters to their JSON-safe escaped equivalents and back.
Format JSON Lines (JSONL) data — pretty-print each line as formatted JSON for readability and debugging.
Convert images to Base64 encoded data URIs directly in your browser. Supports PNG, JPG, WebP, SVG, and GIF. 100% client-side.
Convert messy CSV or Excel sheets from clients into clean JSON in one batch. Handles missing values, nested rows, and generates strict JSON schemas for 50+ files at once. Everything runs locally in your browser — nothing is uploaded.
Base64 to JSON Decoder lets you decode Base64 strings and pretty-print JSON data — paste encoded text to see the decoded result instantly. Everything runs locally in your browser — nothing is uploaded.. It works on any device with a modern web browser.
Decode Base64 strings and pretty-print JSON data — paste encoded text to see the decoded result instantly. Everything runs locally in your browser — nothing is uploaded. It runs entirely in your browser — no software installation or data uploads required.
Paste or type your content directly into the provided text area.
Yes. After the initial page load, Base64 to JSON Decoder runs entirely on your device with no internet connection needed. All processing is done locally.
Decodes the Base64 string to its original text, then attempts to parse it as JSON. If successful, the JSON is pretty-printed with syntax highlighting.
Yes. Paste any Base64 string and the tool attempts to decode it. If the result is valid JSON, it's automatically pretty-printed.
Yes. You can paste either Base64-encoded JSON or raw JSON. Raw JSON is directly pretty-printed without Base64 decoding.
Yes. Deeply nested JSON objects and arrays are formatted with proper indentation (2 spaces) and syntax highlighting for easy reading.
No. All decoding and formatting happens locally in your browser. No data is transmitted to any server.