v1.405.1 · Tools for work and play

Online tools for
documents, code & money.

Edit and merge PDF files, encode Base64, format JSON, test APIs, compare financial calculations, and split expenses with friends. Choose the tool that fits your task.

Explore the workflow

Chrome 88+ · Manifest V3 · Free · No account required

01INSPECTSee every request.Network · Console · DOM02UNDERSTANDConnect the details.Storage · Security · TLS03BUILDMake the next move.Mock API · API Tester
</> Kernel Extension — Console
❯ network inspect github.com
✓ POST /api/user 200 42ms
✓ GET /cdn/app.js 304 12ms
0 trackers detected
 
❯ cert inspect github.com
✓ TLS 1.3 · Grade A · 180 days remaining
✓ HSTS enforced · CSP present
 
❯ mock add /api/user
✓ Rule active · contains /api/user → 200
# 49 tabs. One extension.
Kernel Extension — attached0.0 KB transmitted
One workspace, many directions

Tools for the work
you do next.

Kernel brings practical utilities, developer tools, document workflows, and small experiments into one calm home.

Available

PDF workspace

Merge, convert, edit, protect, sign, and compare documents in your browser.

Open PDF tools

Pick up where you left off

KERNEL BUSINESS / ERP FOR SMALL TEAMS

From the first order
to the final payment.

GST billing first, then purchasing and stock, accounts, sales and shipping, production, quality and maintenance as your business needs them. Every module works on the same records, for an owner and a small team in India.

Start a free trialExplore Kernel Business
A CONNECTED WORKFLOW

See the whole journey.

Kernel BusinessIllustrative workflow · Sample records

Sales and shipping

Start with an order.

SALES ORDER · SO-0042
Customer
Sample customer
Item
Desk lamp
Quantity
10 units

One customer. One shared record.

  1. 01Order
  2. 02Stock
  3. 03Delivery
  4. 04Invoice
  5. 05Payment
  6. 06Books

Sample records, from order to stock, delivery, GST billing, payment and books. Add-on modules depend on your plan.

Loops automatically
Read the workflow
  1. Order: Customer: Sample customer; Item: Desk lamp; Quantity: 10 units. One customer. One shared record.
  2. Stock: On hand: 24 units; Reserved: 10 units; Available: 14 units. Plan the work with stock in view.
  3. Delivery: Linked order: SO-0042; Picked: 10 of 10 units; Dispatch: Ready to confirm. Keep delivery connected to the order.
  4. Invoice: Taxable value: INR 10,000; GST · sample 18%: INR 1,800; Invoice total: INR 11,800. Clear totals. A record your team can follow.
  5. Payment: Invoice: INV-0031; Amount received: INR 11,800; Balance due: INR 0. See what was paid and what is still owed.
  6. Books: Sales and purchases: Connected records; Stock and production: Shared workflow; Accounting: One set of books. Choose the modules your team needs.
Billing · in every plan

Billing and receivables

Raise quotations and GST invoices, take payments and see who owes you.

  • Customers and items saved once, picked on every document
  • Quotation → proforma → invoice → receipt without retyping
  • Part payments, outstanding and ageing by customer
  • Customer statements and a monthly sales register
See it on Kernel Business
  • 7-day free trial Every module switched on
  • Up to 5 people Each with their own sign-in and role
  • GST built in Invoices and a monthly GST working
  • Encrypted With a key for each business
  • Monthly, quarterly or yearly Paid in Telegram Stars
New · Kernel Split

Split bills and trips with friends.

The free Splitwise alternative: no sign-up, no daily limits and no ads.

  • Every kind of split, even by item
  • Settle up with UPI
  • Install it as an app on your phone
Start splittingHow it works
Features
Every tool you need.
Nothing you don't.

All tools live inside your existing DevTools panel — no new windows, no context switching. Grouped the way you'd already read a box model: the thing itself, out to your own workspace.

49 matching tools

Content · Free · PDF / HTML

Bug Report

Capture console errors and failed API endpoints, payloads, responses and network errors in a redacted snapshot. Add reproduction notes and an optional screenshot, then download branded HTML or a watermarked PDF locally. Review screenshots before sharing.

Get the extension Available inside Kernel DevTools. The illustration is a guide, not a live inspection.
A clearer way to work

From “why?”
to “there it is.”

Stay curious. Stay in context. Follow your next breakthrough.

01
Follow the signal

Inspect.

Start with what the browser sees. Explore requests, console messages, and the live DOM without leaving your page.

02
Find the missing piece

Understand.

Connect the details. Read response headers, inspect storage, and check certificates to understand what is really happening.

03
Make your next move

Build.

Turn insight into action. Mock an API response, test a request, and keep iterating right where you work.

Discover all 49 tabs
tabs49
trackers0
manifestMV3
accountnone
Extension privacy
Your inspected data.
On your device.

Kernel Extension collects no telemetry, sends no analytics, and stores mock rules locally in chrome.storage.local. Inspection tools read the selected tab. Cookie and storage editors, mock rules and other explicit editing actions can change it when you use those controls. Website advertising and shared products have separate data handling described in our privacy policy.

No telemetry
No analytics
No cloud sync
Local-only storage
Explicit editing controls
Install
One click.
Any browser.

Live on Chrome, Edge, and Firefox — install directly from the official store, no developer mode required.

🌐Chrome InstallationChrome 88+ · Manifest V3
Step 01
Open the store

Use Install on Chrome to open the installation options.

Step 02
Add the extension

Follow the official store prompts to add Kernel DevTools to your browser.

Step 03
Open DevTools

Open browser DevTools and select the Kernel DevTools panel.

Free · No account · Chrome 88+ · Manifest V3

Prefer working in your editor? The API Tester is also available as a standalone VS Code extension.