What is ConvertHub?
ConvertHub is a free hub of data converters. JSON, CSV, YAML, XML, Base64, JWT, UUID, and hashes run in your browser.
ConvertHub
Free data & format converters that never see your data
Convert JSON, CSV, YAML, and XML, encode Base64, decode JWTs, generate UUIDs and hashes — entirely in your browser. Your data never leaves your device.
100% in your browser · data never leaves your device
✓ No upload✓ No signup✓ Works offline✓ Unlimited
Cross-Format Converters
Convert JSON, CSV, YAML, XML, and more — all in your browser.
Convert
JSON to CSV
Convert JSON to CSV in your browser. Handles nested objects and arrays of records. Your data is never uploaded. Free and unlimited.
Convert
CSV to JSON
Turn CSV into JSON in your browser. Choose array-of-objects or keyed output and set the delimiter. No upload, no signup. Free.
Convert
JSON to YAML
Convert JSON to YAML configuration in your browser. Clean, idiomatic output for configs. No upload, no signup. Free and unlimited.
Convert
YAML to JSON
Convert YAML to JSON in your browser. Validates your YAML and reports errors clearly. No upload, no signup. Free and unlimited.
Convert
JSON to XML
Convert JSON to XML in your browser. Customizable root element and attribute handling. Your data is never uploaded. Free and unlimited.
Convert
XML to JSON
Convert XML to JSON in your browser, with attributes and text nodes handled cleanly. No upload, no signup. Free and unlimited.
Convert
JSON to TypeScript
Generate TypeScript interfaces from JSON in your browser. Infers nested types, arrays, and unions. No upload, no signup. Free.
Convert
CSV to Markdown
Convert CSV into a Markdown table for docs and READMEs, right in your browser. No upload, no signup. Free and unlimited.
Convert
CSV to SQL
Generate SQL INSERT statements from CSV in your browser. Name the table and quote identifiers automatically. No upload. Free.
Convert
CSV to Excel
Convert CSV into a downloadable .xlsx workbook in your browser. Handles quoted fields and large tables. No upload. Free and unlimited.
Convert
Excel to CSV
Convert an .xlsx or .xls file to CSV in your browser, reading the first sheet locally. No upload, no signup. Free and unlimited.
Formatters & Validators
Beautify, minify, and validate data formats with exact error positions.
Format
JSON Formatter
Format, beautify, and minify JSON in your browser. Choose indent size and copy clean output. Your data is never uploaded. Free.
Format
JSON Validator
Validate JSON and get the exact line and column of any error, right in your browser. No upload, no signup. Free and unlimited.
Format
XML Formatter
Beautify or minify XML in your browser, with validation and clear errors. No upload, no signup. Free and unlimited.
Format
SQL Formatter
Beautify SQL across MySQL, PostgreSQL, SQLite, and more dialects, in your browser. No upload, no signup. Free and unlimited.
Format
CSS Formatter
Beautify or minify CSS in your browser. Reliable, well-tested formatting engine. No upload, no signup. Free and unlimited.
Format
HTML Formatter
Beautify or minify HTML in your browser. Reliable formatting with optional minify mode. No upload, no signup. Free and unlimited.
Format
Markdown to HTML
Convert Markdown to clean HTML in your browser. Headings, lists, code, links, and tables supported. No upload. Free and unlimited.
Encoders & Decoders
Base64, URL, HTML-entity, JWT, and Hex — encode or decode instantly.
Encode
Base64 Encode
Encode text or files to Base64 in your browser. Handles UTF-8 correctly and large files via the File API. No upload. Free.
Encode
Base64 Decode
Decode Base64 back to text in your browser. Handles UTF-8 and reports invalid input clearly. No upload, no signup. Free.
Encode
URL Encode / Decode
Percent-encode or decode URLs and query strings in your browser. Switch between encode and decode instantly. No upload. Free.
Encode
HTML Entity Encode / Decode
Encode or decode HTML entities in your browser. Escape <, >, &, and quotes for safe templating. No upload. Free and unlimited.
Encode
JWT Decoder
Decode a JSON Web Token header and payload in your browser. No signature is sent anywhere. Read claims locally. Free and unlimited.
Encode
Hex Encode / Decode
Convert text to hexadecimal and back in your browser. Supports UTF-8 bytes and space/case formatting. No upload. Free and unlimited.
Developer Utilities
UUID, ULID, timestamps, regex testing, and hash/checksum generators.
Dev
UUID Generator
Generate RFC 4122 UUIDs (v4 random and v7 time-ordered) plus ULIDs in your browser, one or in bulk. No upload. Free and unlimited.
Dev
Timestamp Converter
Convert Unix timestamps to ISO dates and human-readable time across timezones, in your browser. No upload. Free and unlimited.
Dev
Regex Tester
Test regular expressions against your text and see every match with groups, in your browser. Set flags and iterate. No upload. Free.
Dev
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512, and CRC32 hashes in your browser via Web Crypto. Your input is never uploaded. Free and unlimited.
Updated 17 August 2026
What is ConvertHub?
ConvertHub is a set of data converters. JSON, CSV, YAML, and more run in your browser.
- Converters run in your browser.
- Your data stays on your computer.
- You do not need an account.
How to use it
- Pick a converter from the list.
- Paste or open your data.
- Copy or download the result. The data stays on your device.
FAQ
Do you upload my data?
No. Parsing happens in your tab. We do not receive the contents.
Do I need an account?
No. Open a converter and start.
Does it work offline?
Yes, after the first load.
Who makes ConvertHub?
SW Commercial makes ConvertHub. The parent site is https://sw-commercial.com.