Browser-based · client-side · free

Every data tool
you reach for,
in one tab.

// Stop pasting sensitive data into random sites.
// 30 tools. Client-side. Nothing leaves your machine.

30+
Tools
0B
To Servers
100%
Free
json-formatter
regex-tester
1{
2  "dataset": "user_events_2026",
3  "records": 1842903,
4  "schema": {
5    "user_id": "string",
6    "event": "string",
7    "ts": "unix_ms",
8    "active": true
9  }
10}
valid JSON · 10 lines · 218 chars
How it works
01

Pick a tool, paste your data

Open any tool and paste text or drop a file. No account, no upload step, no waiting on a server to accept the request.

02

It runs in your browser

Formatting, validation, and conversion all happen locally with JavaScript. Your data never leaves the tab it's typed into.

03

Copy, download, close the tab

Grab the result and go. Nothing is stored on our end, so there's nothing left behind once you're done.

01 Data Formats 13 tools
01 JSON Formatter Validate, pretty-print, and locate syntax errors by line. .json → 02 CSV Cleaner Trim whitespace, remove duplicates and empty rows. .csv → 03 SQL Formatter Beautify and standardize SQL keyword casing and indentation. .sql → 04 Code Formatter Format messy JavaScript, CSS, HTML, JSON, and more with Prettier. prettier → 05 JSON ⇄ CSV Convert between JSON and CSV in both directions. conv → 06 XML Formatter Indent and validate XML documents instantly. .xml → 07 YAML ⇄ JSON Switch between YAML and JSON config formats. conv → 08 CSV → SQL Paste CSV, get ready-to-run SQL INSERT statements. INSERT → 09 JSON Schema Paste JSON, get its JSON Schema for API docs and validation. schema → 10 Base64 Encode or decode Base64 strings instantly in your browser. encode → 11 JWT Decoder Decode JWT headers and payloads, and check expiry — offline. jwt → 12 Timestamp Convert Unix timestamps to human dates and back. unix → 13 Regex Tester Test and debug regular expressions with live highlighting. RegExp →
02 Text Tools 6 tools
14 Case Converter Switch between UPPER, lower, Title, camelCase, snake_case. txt → 15 Word Counter Count words, characters, sentences, and reading time. txt → 16 Diff Checker Compare two texts and highlight additions and removals. diff → 17 Markdown Preview Live-render Markdown as you type — instant preview. .md → 18 Lorem Ipsum Generate placeholder text by paragraphs, sentences, or words. placeholder → 19 Text → Slug Convert titles to URL slugs, handles accents and special chars. URL →
03 Image Tools 4 tools
20 Image Converter Convert between JPG, PNG, WebP, and more formats. img → 21 Image Compressor Reduce file size without visible quality loss. img → 22 Image Resizer Resize images to exact pixel dimensions or percentages. img → 23 Image → Base64 Drop an image, get a data URL ready to paste into CSS or HTML. data URL →
04 Media Tools 1 tool
24 Video & Audio Toolkit Trim clips, convert formats, extract audio, and create GIFs with FFmpeg. ffmpeg →
05 Spreadsheets 2 tools
25 Excel → CSV / JSON Extract sheets from Excel files as CSV or JSON. .xlsx → 26 CSV → Excel Package tabular data into a proper Excel file. .xlsx →
06 PDF Tools 4 tools
27 Merge PDFs Combine multiple PDF files into a single document. .pdf → 28 Split / Extract Pull specific pages or ranges out of a PDF. .pdf → 29 Rotate Pages Rotate individual or all pages 90°, 180°, or 270°. .pdf → 30 Compress PDF Reduce PDF file size for sharing and storage. .pdf →
From the blog
Privacy

Why You Should Never Paste Sensitive Data Into Random Online Tools

What actually happens to your data on server-side "free" tools, and why that's a problem for API keys and exports.

 Data Formats

How to Format and Validate JSON: A Developer's Guide

The syntax errors that trip people up most often, and how to catch them before they reach production.

 Code

Regular Expressions for Beginners

Patterns, flags, and capture groups explained with strings you can actually test against.
View all articles →