Converters
Free online converters for data formats, units, colors, currencies, images, and more. Convert JSON, CSV, XML, YAML, timestamps, number bases, and units — all instant and browser-based.
ToolStand's converter collection handles data formats (Base64, JSON, XML, CSV, YAML, SQL, JWT), units (currency, measurement), encoding (URL, HTML entities, case), and timestamps. All conversions happen locally — files never leave the browser. Key tools: Base64 Encoder/Decoder with file support, JSON Formatter with validation, Unit Converter supporting 15+ measurement categories, Currency Converter with live exchange rates.
How to Choose the Right Converter
Data Format Conversion
| Goal | Best Tool | Why |
|---|---|---|
| CSV to JSON or back | CSV to JSON | Bidirectional, handles nested data |
| SQL dump to JSON | SQL to JSON | Multi-dialect, multi-table |
| XML to JSON or back | XML to JSON | Bidirectional, preserves structure |
| Validate and convert YAML | YAML Validator | Syntax check, JSON conversion |
| JSON to Java classes | JSON to Java | Generates typed POJO classes |
Encoding and Text Conversion
| Goal | Best Tool | Why |
|---|---|---|
| Encode/decode Base64 | Base64 Encoder | Binary to text, Base64URL variant |
| Encode URLs | URL Encoder | Percent-encode special characters |
| Escape HTML entities | HTML Entity Encoder | Prevent XSS, embed code safely |
| Decode JWT tokens | JWT Decoder | Read token header and payload |
Number, Unit, and Practical Converters
| Goal | Best Tool | Why |
|---|---|---|
| Convert between units | Unit Converter | Length, weight, temp, volume, speed |
| Convert currencies | Currency Converter | Live ECB rates, 30+ currencies |
| Convert image formats | Image Format Converter | PNG, JPG, WebP, BMP conversion |
| Convert color formats | Color Code Converter | HEX, RGB, HSL, HSV |
| Convert number bases | Number Base Converter | Binary, hex, octal, decimal |
| Convert Unix timestamps | Timestamp Converter | Unix time to date and back |
| Change text case | Case Converter | Upper, lower, title, camel, snake |
| Convert Roman numerals | Roman Numerals | Numbers to Roman, and reverse |
All converters run client-side — your data stays in your browser. Currency rates from ECB via Frankfurter API.
Data Format Converters
Modern development involves dozens of data formats — JSON for APIs, CSV for spreadsheets, XML for enterprise systems, YAML for configuration, and more. Converting between these formats manually is tedious and error-prone. ToolStand converters handle all these transformations instantly in your browser. Paste your data in one format, get the equivalent in another. No data leaves your device.
Unit and Measurement Converters
The world uses multiple measurement systems, and converting between them is a daily necessity. The unit converter handles length, weight, temperature, area, volume, and speed — all in one tool. The currency converter fetches live exchange rates and shows 7-day trends. The timezone converter shows current local times across cities worldwide.
Color and Number Converters
Designers need to move between HEX, RGB, and HSL color formats. Developers need to translate between binary, octal, decimal, and hexadecimal. Writers need to switch between text case formats. ToolStand provides specialized converters for each domain, with real-time conversion as you type.
All Converters on ToolStand
- JSON Formatter — Format and validate JSON with color-coded output and error line detection.
- CSV to JSON Converter — Bidirectional CSV and JSON conversion with PapaParse.
- SQL to JSON Converter — Convert SQL dump files (CREATE TABLE + INSERT) to structured JSON. Multi-dialect support.
- XML to JSON Converter — Bidirectional XML and JSON conversion with recursive mapping.
- YAML Validator & Converter — Validate YAML and convert to JSON with error detection.
- Base64 Encoder & Decoder — Encode and decode Base64 strings. Supports Base64URL variant.
- URL Encoder & Decoder — Percent-encode and decode URL strings for safe transport.
- HTML Entity Encoder — Encode and decode HTML entities for safe rendering and XSS prevention.
- Unix Timestamp Converter — Convert timestamps to dates and back. Handles seconds and milliseconds.
- Color Code Converter — Convert between HEX, RGB, and HSL. Pick and copy color codes.
- Case Converter — 8 text case formats: UPPER, lower, camelCase, snake_case, and more.
- Number Base Converter — Binary, octal, decimal, hex conversion in real time.
- Number to Words Converter — Convert numbers to words in 8 languages: English, Turkish, German, French, Spanish, Arabic, Hindi, Chinese.
- Roman Numeral Converter — Convert numbers to Roman numerals and back. Up to 3,999,999.
- Unit Converter — Length, weight, temp, area, volume, speed — all measurement categories.
- Currency Converter — Live exchange rates from Frankfurter API with 7-day trend chart.
- Image Format Converter — Convert between PNG, JPEG, and WebP formats. Batch processing.
- JSON to Java Converter — Convert JSON to Java POJO classes with Lombok annotations.
- JWT Decoder — Decode JWT header and payload sections.
Frequently Asked Questions
JSON to CSV vs CSV to JSON — which direction do I need?
Convert JSON to CSV when you need spreadsheet compatibility (Excel, Google Sheets can open CSV directly). Convert CSV to JSON when building APIs or web applications that consume structured data. The CSV to JSON Converter handles both directions — paste your data and switch the conversion mode. Nested JSON objects are flattened for CSV export; flat CSV rows become nested JSON on import.
Will I lose data when converting between formats?
It depends on the formats. XML to JSON conversion preserves all text content and attributes but XML comments and processing instructions are lost (they have no JSON equivalent). JSON to Java generates typed classes — field names and structure are preserved exactly. YAML to JSON is lossless for data (both are tree-structured), but YAML anchors and aliases do not survive conversion. For encoding conversions (Base64, URL Encode), the process is fully reversible — decode returns the exact original.
How accurate is the Currency Converter — are these live rates?
The Currency Converter fetches exchange rates from the Frankfurter API (European Central Bank data). Rates are updated daily on business days. For real-time trading or forex, use a dedicated financial platform — this converter is designed for travel estimates, e-commerce pricing, and general reference. The Unit Converter uses fixed conversion factors (metric/imperial) and is 100% accurate for standard units.
Can I convert large files with these browser-based converters?
These are client-side tools — they process data in your browser's memory. The Image Format Converter handles typical images (up to ~20MB comfortably) using the Canvas API. For text-based converters (JSON, CSV, XML, Base64), files up to several megabytes work well. These are developer utilities, not batch processing engines — for gigabyte-scale ETL, use a command-line tool or server-side pipeline.
What is the difference between YAML, JSON, and XML — which converter should I use?
YAML is human-readable with minimal syntax (indentation-based, great for config files like Docker Compose and CI/CD). JSON is the web standard for APIs — compact, universally supported. XML supports schemas, namespaces, and validation — common in enterprise and legacy systems. Use the YAML Validator for config debugging, XML-JSON Converter for API migration, and XML Formatter for enterprise document processing.
Do these converters work offline and are my files private?
Yes. All converters process files entirely in your browser using JavaScript — nothing is uploaded to any server. The Color Code Converter, Case Converter, Number Base Converter, and Roman Numeral Converter work completely offline after the first visit. Converters that need external data (Currency Converter via Frankfurter API) require a network connection for rate updates.