Data Converters
Convert between CSV, JSON, XML, and Excel formats online for free. Paste or drop your data and get clean output instantly — no uploads, no sign-up.
Convert CSV to JSON Online — Free Convert CSV to a JSON array of objects online for free — header row becomes keys, quotes and commas handled properly. No upload, no sign-up. Convert JSON to CSV Online — Free Convert a JSON array of objects to CSV online for free — columns are the union of all keys, nested values stringified. No upload, no sign-up. Convert CSV to XML Online — Free Convert CSV to structured XML online for free — headers become sanitized tags, rows become records. Runs in your browser, nothing uploaded. Convert XML to JSON Online — Free Convert XML to JSON online for free — elements become keys, attributes are kept, and invalid markup is reported with the exact line. No upload. Convert JSON to XML Online — Free Convert JSON to XML online for free — objects become elements, single-key objects name the root. Friendly errors for non-object input. No upload. Convert CSV to Excel (XLSX) Online — Free Convert CSV to a real Excel .xlsx file online for free — quoted fields and UTF-8 preserved, ready for Excel, Numbers, or Google Sheets. No upload. Base64 String Encoder & Decoder Online — Free Encode any text to base64 or decode base64 back to text, with URL-safe variants and data-URI support — free, instant, in your browser. Base64 File Encoder & Decoder Online — Free Encode any file to a base64 string or turn base64 back into a downloadable file — free, in your browser, with no upload involved. YAML to JSON Converter Online — Free Convert YAML to formatted JSON instantly, with live validation that flags syntax errors as you type — free, private, in your browser. JSON to YAML Converter Online — Free Convert JSON to clean YAML instantly, accepting lenient JSON input with comments and trailing commas — free, private, in your browser. YAML to TOML Converter Online — Free Convert YAML configuration to TOML instantly with live validation — free, private, and computed entirely in your browser. TOML to YAML Converter Online — Free Convert TOML configuration to YAML instantly with live validation — free, private, and computed entirely in your browser. JSON to TOML Converter Online — Free Convert JSON to TOML configuration instantly, accepting lenient JSON with comments — free, private, and in your browser. TOML to JSON Converter Online — Free Convert TOML to formatted JSON instantly with live validation of the source — free, private, and computed in your browser. List Converter Online (Sort, Dedupe, Format) — Free Transform a line-separated list: sort, deduplicate, trim, reverse, prefix, suffix, and rejoin with any separator — free, in your browser. Markdown to HTML Converter Online — Free Convert Markdown to HTML with a live preview — headings, links, code blocks, and tables rendered instantly, free, in your browser. Phone Number Parser & Formatter Online — Free Parse any phone number to validate it and see international, national, E.164, and tel: formats plus country and line type — free, in-browser. IBAN Validator & Parser Online — Free Validate an IBAN checksum and parse its country, BBAN, bank identifier, and account number — free, instant, and checked in your browser.