DataPad

Free Online Data Tools

No login. No upload. Data stays local.

80+ Tools 100% Free • No Login • Data Stays Local

Popular Tools

Base64 Encode/Decode

URL Encode/Decode

JSON Code Generator

Color Converter

QR Code Generator

JSON Tools (1)

Format, validate, and edit JSON

Encoding / Encryption (12)

Base32 Encode/Decode

Encode and decode Base32 strings

Base64 Encode/Decode

Encode and decode Base64 strings

URL Encode/Decode

URL percent-encoding and decoding

Unicode Convert

Convert between Chinese and Unicode escape

Encode and decode Morse code

UTF-8 Encode/Decode

Convert string to UTF-8 byte sequence

UUID/GUID Generator

Generate RFC4122 UUID v4

Generate MD5 hash of text

SHA1/SHA256/SHA512 hash generation

AES Encrypt/Decrypt

AES symmetric encryption with key

RSA Encrypt/Decrypt

RSA asymmetric encryption with key pair

Calculate MD5/SHA256 of uploaded file

Formatters (7)

Format and compress JavaScript code

Format and compress CSS code

Format and compress HTML code

Format and beautify SQL statements

Format and compress XML documents

Sort JSON keys alphabetically

Add or remove JSON escape characters

Network (11)

Convert between timestamp and date

Lookup IP address geolocation

Query DNS records for a domain

SSL Certificate

Check SSL certificate details

View HTTP response headers

Subnet Calculator

Calculate subnet from IP and mask

Convert IP address to number and back

Convert curl commands to code

User-Agent Parser

Parse browser User-Agent string

Parse URL into components

robots.txt Generator

Generate robots.txt file

Converters (13)

Convert between JSON and XML

Convert between JSON and YAML

Convert between JSON and TOML

Convert between JSON and CSV

JSON ↔ GET Params

Convert JSON to URL query string

JSON ↔ Python Dict

Convert JSON to Python dictionary

JSON Code Generator

Generate code from JSON (Java, Go, Python, TS...)

Color Converter

Convert RGB/HEX/HSV/CMYK colors

Length, temperature, weight, area, volume, speed converter

Convert between number bases (2-36)

Variable Naming

Convert between camelCase, snake_case, etc.

HTML ↔ Markdown

Convert between HTML and Markdown

HTML ↔ JS String

Convert HTML to JavaScript template string

Image (11)

Compress images in browser

Crop image to selected area

Resize image dimensions

Rotate or flip image

Image Format Convert

Convert between PNG/JPG/WebP

Image Watermark

Add text watermark to image

Image ↔ Base64

Convert image to/from Base64

View image EXIF metadata

Generate favicon ICO file

QR Code Generator

Generate QR Code from text

QR Code Decoder

Decode QR Code from image

Text (8)

Reverse or shuffle text

Remove empty lines, merge or split lines

Text Dedup / Sort

Remove duplicate lines, sort alphabetically

Count characters, words, and lines

Fullwidth / Halfwidth

Convert between fullwidth and halfwidth chars

Simplified / Traditional

Convert between Simplified and Traditional Chinese

Chinese-English Spacing

Add spacing between Chinese and English text

Markdown Editor

Edit Markdown with live preview

Developer (9)

Test regular expressions with highlighting

Cron Expression

Generate and parse cron expressions

Decode and verify JWT tokens

Compare text differences side by side

Random Generator

Generate random string, number, name

Variable Naming

Convert variable naming conventions

Online Code Editor

Online code editor with syntax highlighting

Gradient, flexbox layout, glassmorphism CSS generator

Developer Reference

HTTP status codes, ASCII table, common port numbers

Validation (5)

Validate JSON syntax with error location

Validate XML syntax

Validate YAML syntax

Password Strength

Check password strength level

ID Card Validator

Validate Chinese ID card number

Other (2)

Edit CSV files with spreadsheet-style grid

Merge multiple PDF files into one

Why DataPad

DataPad is a collection of free online data tools that run entirely in your browser. No signup, no upload, no data collection — your files stay on your device, always private and secure. Whether you need to edit CSV files, format JSON data, or work with other data formats, DataPad gives you professional-grade tools without compromising your privacy.

Features

100% client-side processing — data never leaves your device
Multi-format support — CSV, JSON, and more coming soon
Automatic local saving — your work persists across browser sessions
File System Access API — edit files directly from your hard drive
Full i18n support — 13 languages available
Dark mode support — comfortable editing day and night
80+ developer tools: encoding, encryption, formatting, conversion, image processing, and more
Multi-format support: CSV, JSON, XML, YAML, TOML, and more

Privacy

Unlike most online tools, DataPad never sends your files to any server. All parsing, editing, formatting, and exporting happen directly in your web browser using JavaScript and WebAssembly. Your data is yours alone — we can't see it, access it, or store it. This makes DataPad safe for sensitive data like financial records, customer lists, and personal information.

Frequently Asked Questions

Is DataPad free?

Yes, DataPad is completely free to use. No signup, no subscription, no hidden fees.

Do I need to create an account?

No. You can start using DataPad immediately — no account, no installation, nothing to download.

Where is my data stored?

All your data is stored locally in your browser's IndexedDB storage. It never leaves your device.

What tools does DataPad offer?

DataPad offers over 80 free online tools including encoding/encryption, formatting, image processing, text manipulation, conversion, networking, and validation tools. Browse all tools from the navigation bar or use the search function.

Can I use DataPad offline?

Yes. Once the page has loaded, all tools work without an internet connection.

Is my data secure?

Absolutely. All processing is client-side. We don't have servers that store your data. Your files are never uploaded anywhere.