How to See What Data a Website Sends
Use Chrome or Edge DevTools to see what data a website sends. Real screenshots explain file uploads, request payloads, and form data sent before submission.
Read GuideUseful Tools. Verifiable Privacy.
Get Things Done.
Keep Your Inputs Local.
Format a response, create a password, or convert a file in your browser. LeetTools is for developers and anyone who wants to understand where their data goes.
Start With a Task
Inspect JSON and Text
Format API responses or compare configuration changes without uploading the text.
Create a Password or Passphrase
Use your browser's cryptographic random source, then save the result in your password manager.
Convert or Combine Images
Resize pictures, change formats, or stitch screenshots together on your device.
Tools for Everyday Work
Open a tool for the task at hand. Each page explains its controls and practical limits.
JSON Formatter & Validator
Format, minify, and check JSON syntax locally. Preserve large numbers and original value tokens, with optional key sorting.
Open ToolJSON Diff & Text Diff Viewer
Compare JSON, API responses, configuration files, and plain text locally with line-level and word-level highlights.
Open ToolPassword Generator
Generate passwords locally with cryptographic randomness. Choose length and character sets, and see a conservative entropy estimate.
Open ToolImage Converter
Batch convert PNG, JPEG, WebP, and AVIF images locally in your browser with quality, resize, and ZIP download controls.
Open ToolArchive Extractor
Browse and extract Zip, 7z, RAR, Tar, and more in your browser. Your file never leaves this device. A password field appears only when you might need it.
Open ToolHAR Sanitizer
Redact query tokens, form passwords, and leftover cookies from a HAR file in your browser before sharing it with support.
Open ToolOur Promise Is Open to Inspection
We commit to building safe tools. Inputs to tools labeled as processing locally stay in your browser. We keep those inputs out of our analytics and advertising integrations.
Production pages load Google Analytics, and selected content pages may load advertising. Browser Region Auditor deliberately contacts external services for its checks. These requests can share page, browser, or network information. Read our Privacy Details and inspect the requests yourself.
Try It With a Dummy File
- Open DevTools, select Network, keep All request types visible, and reload the tool page.
- Use an invented sample in Image Converter or HAR Sanitizer. Record selection, processing, and download.
- Inspect outgoing URLs, headers, and payloads for the sample's name and contents. Record the destination and what you can establish.
The guide teaches you to inspect any website, with screenshots and the limits of what a capture can prove.
Understand the Tools You Use
When AI can generate an answer or a script, you still need to check the result and know where your data goes. These guides explain the steps, tradeoffs, and limits so you can make that decision yourself.
How to Create a Strong Password
Learn what actually makes a password strong—length, randomness, and uniqueness—and generate one locally with the LeetTools Password Generator.
Read GuidePassphrase vs Password: Which Should You Use?
Compare passphrases and passwords by entropy, memorability, and where each fits. Decide based on how the credential will be stored and typed.
Read GuideHold Us to Our Promise
If you find behavior that breaks these promises, we welcome you calling it out publicly. Include the page, action, destination, and a redacted example so others can repeat the check. Our Contact Page is also available.
If you trust LeetTools and our tools have helped you, please share the site with others who might find it useful.