What you will find here
Every tool is built to do one job well, without sign-ups, watermarks or upload queues. The collection currently includes:
- PDF tools34 tools
Merge, split, compress, convert, sign, redact and edit PDFs. Almost all of them run entirely in your browser.
- Finance calculators and documents32 tools
Loan, investment and Indian income-tax calculators, plus invoice, rent receipt, salary slip and letter generators.
- Developer and everyday utilities25 tools
JSON formatter, diff checker, regex tester, QR codes, passwords, image compression and more.
- Base64 tools59 tools
Encode, decode, validate and repair Base64 for text, files and data URLs.
Alongside the website there are a few dedicated products:
- Kernel DevTools
- A browser extension for Chrome, Edge and Firefox that adds more than 30 developer tools to the browser’s DevTools panel.
- Kernel API Tester
- An HTTP client for VS Code that keeps requests in plain files next to your code.
- Kernel Split
- Shared expenses for trips and households, with no account needed.
- Kernel Business
- Billing, stock and accounts for small businesses, the one paid product on the site.
How your files are handled
Most tools process your files and figures inside your browser tab. PDFs, images, spreadsheets and calculator inputs are not uploaded to our servers, and nothing is kept once you close the page. Each tool says on its own page whether it works locally.
A few features need a server because they are shared between people or devices: Kernel Split groups, group polls, shared lists, event invites, live location links, one-time secret links, multi-signer sign requests, the optional source-text job in the PDF Editor, and Kernel Business. The privacy policy explains exactly what each one stores and for how long.
How the site is funded
The free tools are paid for by advertising. Pages with a written guide, such as the PDF tools and finance calculators, can show Google ads and sponsor banners. Pages where you enter personal data, the games, Kernel Business and our policy pages show no ads. Kernel Business is funded by its subscriptions. Advertisers can book sponsor banners on the Advertise page; they never get access to your files or data.
Who builds it
Kernel Tools is designed, written and maintained by an independent developer. The same developer publishes the Kernel DevTools extension on the Chrome Web Store, Microsoft Edge Add-ons and Firefox Add-ons. There is no investor or parent company, and there are no data partnerships.
Calculators follow the published rules they name, such as RBI loan-to-value limits or the Income-tax Act slabs for the year shown. They are estimates for planning and not financial, tax or legal advice.
Get in touch
Found a bug or want a feature? Use Report an issue. For anything else, see the contact page. The terms of use cover how the site may be used.