JSON formatter, Base64 codec and data file converters

Choosing a Developer tool

The JSON formatter tidies API responses: one-line JSON becomes a readable, indented tree in one click - debugging interfaces, reading config files and finding a missing bracket all rely on it - and it also validates whether JSON is legal. Base64 encoding and decoding covers token inspection, embedding image data and signatures, with a URL-safe mode for web use; the URL encoder turns Chinese characters and special symbols into percent-encoded form for sharing links and building requests.

The data converter family covers CSV, Excel, JSON and XML in both directions - CSV to Excel, Excel to CSV, CSV to JSON, JSON to CSV, JSON to XML, XML to JSON, CSV to XML and XML to CSV - plus Excel to PDF, Excel to JSON, Excel to HTML, Excel merge and split. Drop a spreadsheet or text file, pick the target format, and download the converted result; column types, nested structures and tag hierarchies are preserved so the output is ready to use.

Search terms such as "JSON formatter", "Base64 encode decode", "URL encode", "text diff tool", "MD5 generator online", "SHA256 hash", "CSV to Excel", "Excel to CSV", "JSON to XML" or "crontab generator" all lead here. Everything runs locally in your browser - code, text and files are never uploaded, free, with one-click copy and download.

Under the hood: the formatter detects and fixes common bracket errors, Base64 supports both standard and URL-safe alphabets, the hash generator computes MD5, SHA-1, SHA-256 and SHA-512 for strings and files, and the text diff highlights changed lines between two pasted configs or logs. For teams that handle sensitive code or data, the local-only behavior is the deciding factor: no clipboard history on a server, no paste-and-forget services.

Developers pretty-print API responses to read the structure, decode tokens and images with Base64, and verify file downloads with SHA-256. Ops teams compare two config files to find what changed, and data-heavy roles move tables between CSV, Excel, JSON and XML without installing office software. Every tool runs locally in the browser, so sensitive data never leaves your device.

How to use them: copy JSON from the console or API docs, paste, and format with one click - indentation, line breaks and key highlighting make the structure obvious, and you can minify it back to a single line for transport; for data work, drop a .csv or .xlsx file into a converter and download the target format in seconds; the crontab generator builds cron expressions by clicking instead of memorizing syntax.

These tools remove the daily friction of development and data processing: no IDE, no throwaway scripts, no sign-up-walled web services. Front-end and back-end integration, log troubleshooting, config comparison, spreadsheet cleanup and format adaptation - paste or drop, process, copy or download, done.

Common questions: "Is my code safe to paste?" - everything runs in your browser, nothing is sent anywhere; "Are my spreadsheets uploaded?" - no, conversion happens locally and the original file stays on your device; "Is there a size limit?" - text tools handle long configs and logs easily, while very large spreadsheets depend on browser memory; "Do I need an account?" - no, all tools on this page are free and instant.