Browse developer tools by category with support for multiple language interfaces and quick search.
Convert Excel or CSV to JSON with multi-sheet support, field picking, and type fidelity
Free online Excel to JSON converter. Upload an .xlsx file or paste a table copied from Excel or WPS. The first row becomes the keys, and you get an array of objects with multi-sheet support, column selection, empty-cell and date policies, and long IDs that keep every digit — all processed locally in your browser.
Convert URI components, full URIs, and form encoding in real time
Free online URL encoder and decoder. Convert URI components, full URIs, and form encoding in real time, handle spaces and plus signs in query parameters correctly, and keep history only in this browser.
Generate custom QR codes, recognize QR codes in images
Supports generating styled QR codes (colors, sizes, error correction rates) and can upload images or use camera to recognize QR code content.
Support Base64 encoding and decoding for text and files, can preview images
Support standard Base64 and URL-safe formats. Encode text or files, automatically recognize and preview image content, and save history records.
Chain Base64, JWT, hashes, PBKDF2, and AES-GCM with browser-side salted encryption workflows
A local-first encoding and cryptography workbench. Combine Base64/Base64URL, Hex, URL, HTML, JWT, SHA, HMAC, PBKDF2, and AES-GCM operations into repeatable recipes without uploading keys or input.
Decode Unicode escape sequences online, convert code points and HTML entities
Free Unicode decoder online. Decode Unicode escape sequences, HTML entities, code points, and UTF-8 bytes, then encode plain text back to Unicode escapes when needed. Useful for API payloads, logs, and multilingual text debugging, with all processing kept in your browser.
Test regular expressions in real-time, view matching results and capture groups
Supports regex matching, replacement, preset pattern library and syntax reference, real-time highlighting of matching results, performance testing and history records.
Run Python 3.8-3.12 with file uploads, project folders, and popular libraries
Free online Python compiler for 3.8-3.12. Upload CSV, Excel, fonts and .py files, manage project folders, use NumPy/Pandas/Matplotlib, and export ZIP.
Run PHP online instantly, test snippets in PHP 7.4-8.5, and compare output in your browser
Free PHP code runner to run PHP online, execute snippets, test PHP code, and compare PHP 7.4-8.5 behavior in your browser. No Apache, Nginx, or local setup. Powered by local WASM execution with syntax highlighting, examples, history, and shareable links.
Open .MD Files with Live Preview
Open and preview .md and README files online with GFM, syntax highlighting, Mermaid, math, and local browser-only processing. No install or sign-up required.
Validate XML online with DTD and XSD schema checks plus formatting tools
Free XML validator online. Validate XML syntax, check XML against DTD or XSD schema rules, format documents, and convert XML to JSON for debugging API responses, feeds, and config files. Everything runs locally in your browser for private validation.
Run Java 8, 11 and 17 in your browser, no JDK required
Powerful Java Playground supporting Java 8, 11, and 17 versions. Based on CheerpJ WebAssembly JVM technology, compile and run Java code directly in the browser. Features syntax highlighting, preset examples, history records, and more without installing any software.