164 free tools · Private · In-Browser

Data, CSV & JSON Tools

Tools for messy data: convert between CSV, JSON, XML and YAML, sort and split JSON, get quick column statistics, clean lists, find duplicates and pull random samples. Paste your data in and nothing is uploaded, which matters when it includes customer details.

Random Sampler

Free random sampler that selects a count or percentage of pasted rows. Shuffle lists, audit datasets, or create review samples locally fast.

JSON Sorter

Free JSON sorter that recursively sorts object keys for stable diffs and reviews. Format sorted JSON locally in your browser.

Query String to JSON

Free query string parser: paste a URL or query string to get its parameters as formatted JSON, decoded locally in your browser.

Plist to JSON Converter

Free XML plist to JSON converter that parses typed dictionaries, arrays, strings, numbers, booleans, dates, and data with strict errors in your browser.

Frequency Table Builder

Free frequency table builder that counts repeated values and percentages from pasted rows. Sort results and copy a CSV summary locally fast.

JSON Array Splitter

Free JSON array splitter that chunks a large JSON array into smaller arrays. Choose batch size and copy each chunk from your browser safely now.

Duplicate Contact Finder

Find likely duplicate contacts from pasted names, emails, or company rows.

Column Row Transposer

Free row and column transposer for pasted comma, tab, or pipe-delimited text. Swap tables locally without opening a spreadsheet.

CSV Column Stats

Free CSV column stats tool that calculates count, min, max, average, median, and sum for numeric columns in pasted CSV data locally with copy-ready JSON.

CSV Merger

Free CSV merger for combining multiple pasted CSV blocks into one clean file. Preserve one header row and join datasets locally in your browser.

JSON Schema Example

Build a small JSON Schema example from field names, types, and required flags. An API docs page can create a schema with id, email, and createdAt fields.

JSON to CSV Converter

Convert JSON arrays or objects into copyable CSV locally.

List to Comma-Separated

Free tool to convert a list of lines into a comma-separated string, with optional quotes, in your browser.

Column Name Standardizer

Standardize pasted column names into clean snake_case style.

CSV Column Reorder Tool

Free csv column reorder tool that runs locally in your browser.

CSV to JSON Lines

Free CSV to JSON Lines converter that turns each row into one compact JSON object per line. Handles quoted fields and runs entirely locally.

Email List Cleaner

Clean pasted email lists by trimming spaces, lowercasing addresses, and removing duplicates.

Fake JSON Data Builder

Free fake JSON data builder that creates mock records from a simple field schema. Generate sample API data locally.

JS Minifier Lite

Free lightweight JavaScript minifier for simple snippets. Remove comments and extra whitespace locally before sharing.

JSON Key Renamer

Free JSON key renamer that applies bulk old-to-new key mappings across nested objects and arrays. Refactor sample data locally and privately.

JSON Schema Visualizer

Visualize JSON schema in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.

JSON to .env Converter

Free JSON to .env converter: flatten a JSON object into environment-variable lines, computed in your browser.

JSON to Python Dataclass

Free JSON to Python tool: infer a @dataclass with typed fields from a sample JSON object, generated locally in your browser.

List Intersection Difference

Free list intersection and difference tool that compares two pasted lists. Find shared, only-left, and only-right values locally with case options.

Markdown Table Generator

Free markdown table generator that runs locally in your browser.

Numbered List Maker

Free numbered list maker for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.

Properties to JSON Converter

Free Java properties to JSON converter that parses continuations, separators, escapes, Unicode codes, and dotted nested paths in your browser.

Variant Naming Cleaner

Clean product variant names for consistency across color, size, material, and style.

CSV Cleaner

Trim CSV cells, normalize headers, and remove blank rows.

CSV Column Extractor

Free csv column extractor that runs locally in your browser.

CSV Deduplicator by Column

Remove duplicate CSV rows by a selected column, keep the first row, and copy the cleaned output locally in your browser.

CSV Viewer

Render pasted CSV as a preview table with row and column counts. Handles quoted commas locally so exports are easier to inspect before sharing.

Data URI Generator

Free data URI generator for text snippets. Choose a MIME type and create base64 or URL-encoded data URIs locally.

Data URL to File

Free data URL to file converter that decodes base64 data URIs, previews metadata, and downloads the file directly from your browser safely now.

HTML Minifier Lite

Remove comments and extra whitespace from HTML snippets locally.

INI To JSON

Free INI to JSON converter for sectioned config files. Parse common key value files locally in your browser.

JSON Flattener

Free JSON flattener that converts nested objects and arrays into dot-notation keys. Inspect API data or prepare flat exports locally and privately.

JSON Schema Generator

Free JSON schema generator that infers a practical schema from sample JSON. Detect types, arrays, required keys, and nested objects locally.

JSON Schema Sample

Build JSON schema sample in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.

JSON To Go Struct

Free JSON to Go struct generator that infers basic field types and JSON tags from sample objects locally.

JSON to GraphQL Type

Free JSON to GraphQL type generator that safely infers nested object types, scalar fields, lists, and nullability hints from data in your browser.

JSON To Query String

Free JSON to query string converter that flattens simple objects into URL parameters. Build params locally in your browser.

JSON to YAML Converter

Free json to yaml converter that runs locally in your browser.

List Union Dedupe

Free list union and dedupe tool that combines multiple pasted lists into one unique set. Normalize case, trim values, and copy results locally.

Number List Stats

Free number list stats calculator for sum, average, median, mode, range, variance, and standard deviation from pasted values in your browser.

Software Overlap Finder

Compare software tools by feature overlap and decide what to keep, replace, or cancel.

XML Formatter

Free xml formatter that runs locally in your browser.

YAML Linter Lite

Free lightweight YAML linter that flags tabs, odd indentation, and common key spacing mistakes locally in your browser.

YAML to JSON Converter

Free yaml to json converter that runs locally in your browser.

Base64 Encoder & Decoder

Encode text to Base64 or decode Base64 back to readable text with Unicode support.

Base64 File Converter

Free base64 file converter that converts values instantly in your browser. Includes examples, formulas, limits, copy-ready output, and local privacy.

CSV Diff Table Viewer

Convert CSV diff table viewer in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and.

CSV Filter

Free CSV filter that keeps rows matching a column condition. Choose equals, contains, greater than, or less than and export filtered CSV locally.

CSV Row & Column Counter

Free CSV counter: count rows, columns, cells, and empty cells in CSV data, computed locally in your browser.

CSV Splitter

Free CSV splitter that divides pasted rows into smaller chunks by row count. Keep headers on every part and copy each output in your browser.

CSV to JSON Converter

Convert CSV rows into formatted JSON objects locally.

CSV to SQL INSERT

Free CSV to SQL INSERT generator that turns pasted rows into escaped insert statements. Choose table name and create browser-only SQL output.

CSV to TSV Converter

Free CSV to TSV converter: turn comma-separated values into tab-separated values, computed in your browser.

Fake Data Generator

Generate clearly synthetic names, example.com emails, placeholder addresses, and reserved 555 phone numbers from a seed in your browser without uploads.

Fixed-Width to CSV

Free fixed-width to CSV converter that slices pasted text by column widths or ranges. Turn legacy exports into clean comma-separated data locally.

Flatten JSON

Free flatten JSON tool: turn nested JSON objects and arrays into flat dot-notation keys, computed locally in your browser.

Ini Section

Build INI section blocks from names and key-value rows. A local app config can create database host, port, and user keys under one section. In your browser.

JSON Diff

Free JSON diff tool that compares two JSON blobs by path. Find added, removed, and changed values locally.

JSON Duplicate Key Checker

Detect repeated keys inside JSON object text before the last value silently wins. Free and private in your browser, with nothing uploaded and no account.

JSON Escape Unescape

Free JSON escape and unescape tool for string values. Convert raw text to JSON strings and parse them back locally.

JSON Formatter & Validator

Pretty-print, minify, and validate JSON instantly. Private and browser-only.

JSON Lines Formatter

Format newline-delimited JSON records into readable one-record-per-line output. Free and private in your browser, with nothing uploaded and no account.

JSON Merge Patch Builder

Build JSON merge patch in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.

JSON Path Extractor

Extract values from JSON with simple dot paths and array indexes. Useful for API debugging and quick data inspection. Browser-only.

JSON Redactor Tool

Convert JSON redactor tool in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and no.

JSON to Python Pydantic

Free JSON to Python Pydantic generator that safely infers nested BaseModel classes, aliases, lists, and field types from data in your browser.

JSON to Python TypedDict

Free JSON to Python TypedDict generator that safely infers nested dictionary declarations, list members, and annotations locally in your browser.

JSON to Swift Codable

Free JSON to Swift Codable generator that safely infers nested structs, arrays, scalar properties, and CodingKeys aliases locally in your browser.

JSON to Yup Schema

Free JSON to Yup schema generator that infers required nested objects, arrays, scalar fields, integers, and nullable values in your browser.

JSON Unflattener

Free JSON unflattener that rebuilds nested objects from dot-notation keys. Paste flat JSON and restore structure locally in your browser with preview.

JSONL JSON Array Converter

Free JSONL and JSON array converter for line-delimited records. Convert logs and exports locally in your browser.

Launch Checklist Generator

Generate a practical launch checklist for websites, campaigns, tools, and product updates.

Lines to JSON Array

Free tool to convert text lines into a JSON array of strings, with trim and skip-empty options, in your browser.

List Shuffler

Free list shuffler for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.

Readability Scores

Free readability checker: score text with Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, and ARI at once, in your browser.

Service Worker Cache List

Generate service worker precache arrays from pasted asset paths. A static app can prepare shell routes, CSS, and logo paths for an install cache.

Simple Pivot Table Builder

Free simple pivot table builder that groups CSV rows by one column and counts or sums another. Summarize pasted data locally as CSV output now.

SQL Formatter

Free SQL formatter that adds line breaks around common clauses and keywords. Pretty-print simple queries locally.

SQL Where Clause

Convert SQL where clause in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.

TOML To JSON Basic

Free basic TOML to JSON converter for simple key value config files. Parse common TOML subsets locally in your browser.

TSV CSV Converter

Free TSV and CSV converter that swaps tab-separated and comma-separated data with quoted fields. Convert spreadsheet exports in your browser.

URL Safe Base64 Converter

Free URL-safe Base64 converter for standard and URL-safe variants. Swap padding, plus, slash, dash, and underscore locally.

XML to JSON Converter

Free XML to JSON converter that parses elements, attributes, and text into structured JSON. Convert snippets privately in your browser quickly.

YAML Indentation Checker

Check YAML indentation widths and flag tabs or uneven nesting. A line indented by three spaces is flagged when the project expects two-space indentation.

Base64URL Converter

Free Base64URL converter: switch between standard Base64 and URL-safe Base64, adjusting characters and padding, locally in your browser.

Comma-Separated to List

Free tool to split a comma-separated string into a list of lines, computed locally in your browser.

Csv Column Picker

Pick CSV columns by name and output a smaller CSV with only those fields. A lead export can keep name, email, and company while dropping internal notes.

Csv Dedupe Rows Tool

Remove duplicate CSV rows by selected key column and preview the remaining rows. A signup export can keep one row per email address before import.

CSV Header Renamer

Free CSV header renamer that applies bulk old-to-new header pairs while leaving row data untouched. Clean export names locally in your browser.

CSV Sort by Column

Free CSV sorter that orders rows by a selected column, ascending or descending. Handles numbers and text while preserving your header row locally.

CSV To CSS Variable Table

Convert CSV to CSS variable table in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload.

CSV to HTML Table

Free CSV to HTML table converter: turn CSV data into a clean HTML table you can paste into a page, in your browser.

CSV to JavaScript Array

Free CSV to JavaScript array converter that parses quoted commas, escaped quotes, multiline fields, headers, and row arrays in your browser.

Csv To Markdown Table

Convert a small CSV snippet into a Markdown table with header and separator rows. Free and private in your browser, with nothing uploaded and no account.

CSV to XML Converter

Free CSV to XML converter that parses quoted records, validates element names, escapes XML text, and names root and row nodes in your browser.

HTML Description List

Build semantic HTML description lists from term and definition rows. A glossary can turn API Key and Access Token definitions into dl, dt, and dd markup.

Initials Extractor

Free initials extractor for cleaning, transforming, and checking pasted text. Process content locally in your browser without uploads.

JSON Array Group By Tool

Convert JSON array group by tool in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload.

JSON Diff Visualizer

Visualize JSON diff in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.

JSON Flatten Preview Tree

Convert JSON flatten preview tree in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload.

JSON Key Counter

Free JSON key counter: count keys, values, and nesting depth of a JSON document, computed in your browser.

JSON Key Path Extractor

Extract JSON key path in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.

JSON Merge

Free JSON merge tool that deep-merges two objects and shows the combined result. Choose whether arrays replace or concatenate locally with preview.

JSON Path Picker

Pick nested JSON paths from pasted objects and list dot-path style references. Free and private in your browser, with nothing uploaded and no account.

JSON Pointer Tester

Test JSON pointer in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.

JSON String Escaper

Free JSON string escaper: escape text into a JSON string literal or unescape one back to raw text, in your browser.

JSON to C Sharp Class

Free JSON to C Sharp class generator that infers nested models, System.Text.Json attributes, lists, and value types with clear output in your browser.

JSON to INI Converter

Free JSON to INI converter that safely writes root settings, named sections, dotted nested keys, arrays, and safely quoted values in your browser.

JSON to Java Class

Free JSON to Java class generator that safely infers nested POJOs, Jackson property annotations, lists, and scalar field types in your browser.

JSON to Kotlin Data Class

Free JSON to Kotlin data class generator that infers nested serializable models, lists, scalar types, and key aliases with clear output in your browser.

JSON to Markdown List

Free JSON to Markdown list converter that renders nested objects and arrays as readable bullet lists. Document API samples locally in seconds.

JSON to Mongoose Schema

Free JSON to Mongoose schema generator that infers required nested definitions, arrays, strings, numbers, and booleans with valid syntax in your browser.

JSON to PHP Class

Free JSON to PHP class generator that infers typed readonly constructor properties and nested value objects with strict types in your browser.

JSON to Plist Converter

Free JSON to XML plist converter that safely serializes dictionaries, arrays, strings, numbers, and booleans with escaped values in your browser.

JSON to Properties Converter

Free JSON to Java properties converter that safely flattens nested objects and arrays into escaped dotted keys and scalar values in your browser.

JSON to Protobuf Message

Free JSON to Protobuf message generator that infers nested messages, repeated fields, scalar types, and stable field numbers in your browser.

JSON to Rust Serde Struct

Free json to rust serde struct. It infers a Rust struct with Serde derives from one JSON object and keeps entered data private in your browser.

JSON to SQL Table

Free JSON to SQL tool: infer a CREATE TABLE statement with column types from a sample JSON object or array, generated locally in your browser.

JSON to TOML Converter

Convert JSON objects to readable TOML tables, scalar values, and arrays, see clear parse errors, and copy the result privately in your browser.

JSON To TypeScript Interface

Free JSON to TypeScript interface generator that infers basic field types from sample JSON locally in your browser.

JSON To XML Converter

Free JSON to XML converter for simple objects and arrays. Transform sample data into readable XML locally in your browser.

JSON to Zod Schema

Free JSON to Zod schema generator that safely infers executable object, array, scalar, integer, and null validators from a sample in your browser.

JSON Trailing Comma Finder

Find trailing commas that make JSON invalid and show the line numbers with a live preview and one-click copy. Free and private — nothing is uploaded.

JSONL to JSON Array

Free JSON Lines converter: turn newline-delimited JSON objects into a single JSON array, computed locally in your browser.

Jsonpath

Convert jsonpath in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.

Markdown Link List Cleaner

Clean pasted Markdown link lists by trimming duplicates and sorting labels. Everything runs locally in your browser with nothing uploaded and no account needed.

Markdown Table Cleaner

Clean up markdown table in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.

Markdown Task List Progress

Count checked and unchecked Markdown task-list items and show completion percent. Free and private in your browser, with nothing uploaded and no account.

Messy CSV Normalizer

Clean pasted CSV-style rows by trimming spaces, lowercasing headers, and removing duplicate lines.

Ndjson To JSON Array

Convert newline-delimited JSON into a JSON array for fixtures and examples. Three event records can become a bracketed array for a test fixture.

Npm Package JSON Exports

Generate package.json exports maps for ESM, CJS, and type declaration entries. Free and private in your browser, with nothing uploaded and no account.

Payload Remaining Calculator

Calculate remaining and used payload from a rating and a used percentage. Everything is calculated locally in your browser, with no uploads or sign-ups.

Security Headers Checklist

Build a security headers checklist from selected policies and copy a starter block. Free and private in your browser, with nothing uploaded and no account.

Sort JSON Keys

Free JSON key sorter: alphabetically sort object keys at every level, computed locally in your browser.

Spreadsheet Formula Explainer

Create a plain-language checklist for understanding a spreadsheet formula.

SQL Create Index

Convert SQL create index in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.

SQL IN Clause Generator

Free SQL IN clause generator: turn a list of values into a ready SQL IN clause, computed in your browser.

SQL Insert Batch

Convert SQL insert batch in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.

Sql Insert Statement

Build SQL INSERT statements from column names and pasted row values. A seed file can create insert statements for name, slug, and status columns.

SQL Minifier

Free SQL minifier that collapses comments and whitespace into a compact one-line query locally in your browser.

Text Column Extractor

Free column extractor: pull a single column from delimited text by choosing the delimiter and column number, computed locally in your browser.

Toml Key Value

Preview simple TOML key value pairs and section headings from pasted text. A config snippet can show package name, version, and tool settings by section.

Training Load Calculator

Calculate session-RPE training load from minutes and session RPE. Everything is computed locally in your browser, with no uploads and no sign-ups.

Xml Tag Wrapper

Wrap text values in XML tags with attributes and indentation controls. A sitemap-like snippet can wrap loc and lastmod values in url elements.

XML to CSV Converter

Free XML to CSV converter that parses balanced markup, finds repeated row elements, unions child columns, and quotes CSV values in your browser.

YAML Frontmatter

Convert YAML frontmatter in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.

Base64 Url Encoder Decoder

Encode and decode base64url strings for tokens, payloads, and compact IDs. A JWT segment can be decoded after replacing URL-safe characters and padding.

CSV To JSON Schema Inferencer

Build CSV to JSON schema inferencer in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no.

JSON Array Filter Builder

Build JSON array filter in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.

JSON Array Sort Tool

Convert JSON array sort tool in your browser with a live preview and one-click copy — free and private, generated locally in your browser with no upload and.

JSON Lines Inspector

Inspect JSON lines in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.

JSON Patch Builder

Build JSON patch in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.

JSON To Form Fields Builder

Build JSON to form fields in your browser with a live preview and one-click copy. It runs entirely client-side, so nothing is uploaded and no account is needed.

JSON to SQL Insert

Free JSON to SQL INSERT converter that handles object arrays, unioned columns, quoted identifiers, escaped text, booleans, and null in your browser.

Link List HTML

Convert link list HTML in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.

Package JSON Dependency Table

Turn package.json dependency blocks into a Markdown table of package names and versions. Free and private in your browser, with nothing uploaded and no account.

Package JSON Scripts Audit

Lists every script and flags common lifecycle hooks such as preinstall, postinstall, prepare, prepublishOnly, and commands containing deploy keywords.

TSV to CSV Converter

Free TSV to CSV converter: turn tab-separated values into properly quoted CSV, computed locally in your browser.

YAML To Env Preview

Preview YAML to env in your browser with a live preview and one-click copy. Free and private: everything is generated locally in your browser with no upload.