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Free Online Tools
Fast, private tools that help you get work done.No signup. No ads between you and your work.
Try “JSON”, “CSV”, or “schema”
Explore by category
Everything you need, organized.
Image Tools
Compress, resize, convert, and prepare images for any use.
Developer Tools
Format, inspect, encode, and debug everyday development data.
Business Tools
Practical helpers for operations, planning, and daily work.
Finance Tools
Estimate fees, margins, payments, and financial outcomes.
Shopping Tools
Compare prices, decode discounts, and shop with confidence.
Calculators
Get fast, reliable answers for everyday calculations.
AI Utilities
Focused AI helpers built for clear, useful outcomes.
Production tools
49 tools, ready to use.
Private by design. Your work stays in your browser.
Available
JSON Inspection Summary Report
Generate one report covering every UtilityDock JSON Inspection engine.
Available
JSON Field Cardinality Analyzer
Measure distinct values, cardinality percentages, and identifier candidates.
Available
URL Encoder / Decoder
Encode URL components or decode percent-encoded values instantly.
Available
JSON Structural Consistency Analyzer
Detect missing fields, extra fields, type mismatches, and object-shape variations.
Available
JSON Duplicate Path Analyzer
Find repeated normalized paths and recurring JSON structures.
Available
JSON Size Analyzer
Measure JSON bytes, containers, properties, strings, and estimated savings.
Available
JSON Structure Analyzer
Measure JSON depth, containers, leaves, paths, and repeated structures.
Available
JSON Array Frequency Analyzer
Count field values and inspect top, least-common, and percentage distributions.
Available
JSON Null & Missing Value Inspector
Find nulls, missing properties, empty strings, and field completeness.
Available
JSON Type Profiler
Analyze JSON value types, percentages, properties, and normalized paths.
Available
JSON Property Swapper
Swap exact JSON property names or values without overwriting conflicting data.
Available
JSON Value Replacer
Replace exact typed JSON values across selected fields without changing structure.
Available
JSON Property Mover
Move JSON properties to new names or nested paths without overwriting values.
Available
JSON Redactor
Redact sensitive JSON fields with fixed, null, empty, or custom replacements.
Available
JSON Property Copier
Copy JSON properties to new names or nested paths without overwriting values.
Available
JSON Unique Value Extractor
Extract distinct nested values and download JSON or newline-separated TXT.
Available
JSON Array Value Extractor
Extract selected nested values as JSON or newline-separated TXT.
Available
JSON Array Field Renamer
Rename selected nested fields across arrays of JSON objects.
Available
JSON Array Field Remover
Remove selected nested fields from arrays of JSON objects.
Available
JSON Array Field Selector
Keep selected nested fields from arrays of JSON objects.
Available
JSON Array Grouper
Group object arrays by one or more selected fields.
Available
JSON Array Deduplicator
Remove duplicate objects by complete value or selected fields.
Available
JSON Array Filter
Filter object arrays with simple field-based rules.
Available
JSON Array Sorter
Sort object arrays by text, numeric, or ISO date fields.
Available
JSON Unflattener
Rebuild nested objects and arrays from flattened JSON paths.
Available
JSON Flattener
Flatten nested JSON into dot or bracket key paths locally.
Available
JSON Merge Patch Applier
Apply RFC 7386 Merge Patch documents and preview updated JSON.
Available
JSON Merge Patch Generator
Generate RFC 7386 Merge Patch documents from two JSON files.
Available
JSON Patch Applier
Apply RFC 6902 patches and preview updated JSON locally.
Available
JSON Patch Generator
Generate RFC 6902 patches from two JSON documents.
Available
JSON Pointer Explorer
Explore a JSON tree and copy RFC 6901 pointers to any node.
Available
JSON Schema Validator
Validate JSON against a draft-07 schema and inspect every error.
Available
JSON Diff & Compare
Compare two JSON documents and report every structural change.
Available
JSON Lines Converter
Convert JSON arrays and JSONL records in either direction.
Available
CSV to JSON Converter
Turn CSV rows into clean, downloadable JSON objects.
Available
JSON to CSV Converter
Turn an array of JSON objects into downloadable CSV.
Available
JSON Key Sorter
Sort object keys recursively while preserving array order.
Available
JSON Minifier
Reduce JSON size while preserving every value and token.
Available
CSV Merge
Append or join two CSV files locally in your browser.
Available
CSV Split
Split a CSV by rows, file count, or column value.
Available
CSV Filter
Keep matching CSV rows with one clear, private filter.
Available
CSV Column Reorder
Rearrange CSV columns visually while preserving every row.
Available
CSV Delimiter Converter
Convert between comma, semicolon, tab, and pipe delimiters.
Available
CSV Column Remover
Remove unwanted CSV columns and download a clean copy.
Available
CSV Encoding & Delimiter Detector
Identify CSV encoding, separators, line endings, and import risks.
Available
CSV Column Mapper
Rename CSV headers visually and download the updated file.
Available
CSV Header Inspector & Validator
Catch duplicate, blank, and risky headers before an import.
Available
CSV Duplicate Finder & Remover
Find duplicate CSV rows and download a clean file privately.
Available
JSON Formatter & Validator
Format, validate, minify, and download JSON privately.
Data Toolkit
Choose tools by the job you need to complete.
Capability
JSON & CSV Validation Tools
Check syntax, schemas, headers, encodings, and delimiters before bad data reaches another system.
Explore capabilityCapability
JSON & CSV Transformation Tools
Convert, flatten, normalize, and optimize structured data without sending it to a server.
Explore capabilityCapability
JSON Modification Tools
Apply patches and make precise property or value changes while preserving valid JSON.
Explore capabilityCapability
JSON & CSV Data Preparation Tools
Filter, sort, group, deduplicate, select, and reshape records for analysis or import.
Explore capabilityCapability
JSON Inspection Tools
Understand structure, types, completeness, frequency, size, paths, and differences without changing data.
Explore capabilityPractical data workflows
Use structured data with fewer surprises.
JSON validation guide
Fix Invalid JSON: Common Syntax Errors with Examples
Learn how to find and fix trailing commas, bad quotes, missing delimiters, and other common JSON syntax errors.
Read guideAPI contract guide
JSON Schema Validation: Required Fields, Types, and Common Errors
A practical guide to required fields, type rules, formats, and readable JSON Schema validation errors.
Read guideData conversion guide
CSV to JSON for APIs: Headers, Types, Nulls, and Encoding
Convert CSV to reliable JSON for API payloads by checking headers, encoding, value types, and missing data.
Read guideSpreadsheet preparation guide
JSON to CSV for Spreadsheets: Nested Data, Arrays, and Missing Values
Prepare JSON arrays for CSV and spreadsheets without losing track of nested objects, arrays, or missing fields.
Read guideAPI versioning guide
JSON Diff vs JSON Patch vs Merge Patch
Compare JSON Diff, RFC 6902 JSON Patch, and RFC 7386 Merge Patch with practical API update examples.
Read guideJSON-LD preparation guide
Validate JSON Before Using It as JSON-LD
Check JSON syntax and validate data against a draft-07 schema before reusing it in JSON-LD or another structured workflow.
Read guideBuilt to get out of your way.
UtilityDock is a growing collection of focused tools for the small tasks that should never slow down your day.