DEV Community: MUHAMMAD UMAIR

Free Business Calculators for Pricing, VAT and Profit Decisions

MUHAMMAD UMAIR — Mon, 20 Jul 2026 11:03:55 +0000

I built a collection of free online business calculators for freelancers, agencies, importers, and small businesses.

The collection includes:

VAT calculators
Profit and margin calculator
Discount calculator
Percentage calculator
Mortgage calculator
ROI calculator
Freelance hourly rate calculator
Break-even calculator
Salary and hourly converter
Agency profitability calculator
Landed cost calculator with Excel import

The landed cost calculator allocates freight, insurance, customs, handling, VAT, discounts, and other shared expenses across multiple products. Users can download an Excel template, upload completed item data, calculate the landed cost per unit, and export the results.

The agency profitability calculator compares client revenue with labour, overhead, contractor, and software costs to estimate real project or client profitability.

Each calculator includes formulas, field instructions, result explanations, FAQs, and practical business use cases.

No signup or installation is required. The tools work in the browser and support English, Indonesian, Portuguese (Brazil), and Arabic.

Explore the calculators:

https://tools.defaultcoders.com/en/#calculators

Free Online Letterhead Maker for Small Businesses

MUHAMMAD UMAIR — Mon, 20 Jul 2026 10:55:14 +0000

I built a free online letterhead generator for businesses that need polished branded documents without design software.

Users can add:

Company name and logo
Registration and VAT numbers
Address and contact details
Email and website
Headers, footers, signatures, and stamps
Formatted business letter content

The editor includes typography, alignment, lists, links, images, tables, and other formatting controls. A preview option lets users review the complete document before printing or downloading it.

It can be used as an online letterhead maker, business letterhead creator, and free letterhead generator without login.

The layout works across mobile, tablet, laptop, and desktop screens. English, Indonesian, Portuguese (Brazil), and Arabic versions are available, including RTL support.

I built it so freelancers and small companies can create consistent branded documents without paying for complex desktop publishing software.

Create a letterhead online:

https://tools.defaultcoders.com/en/letterhead/

Free Browser-Based PDF Editor Without Signup

MUHAMMAD UMAIR — Mon, 20 Jul 2026 10:53:51 +0000

I built a free online PDF editor for quick document changes directly inside the browser.

It lets users:

Add movable text boxes
Insert signatures and stamps
Add symbols and images
Cover sensitive or incorrect content with whiteout boxes
Resize and reposition added elements
Print or download the edited PDF

No account or software installation is required. Uploaded files never leave the user’s computer; processing happens entirely inside the browser.

Editing progress is automatically stored in browser storage where supported. Users can restore their work after refreshing the page or delete the current PDF and saved progress whenever required.

The responsive interface supports touch controls on phones and tablets. It is available in English, Indonesian, Portuguese (Brazil), and Arabic with RTL support.

I created it for invoices, contracts, forms, certificates, and other documents that need small edits without uploading confidential files to a remote server.

Try it here:

https://tools.defaultcoders.com/en/pdf-editor/

Free Invoice and Business Document Tools Without Signup

MUHAMMAD UMAIR — Mon, 20 Jul 2026 10:52:48 +0000

I built Default Coders Tools to help freelancers and small businesses create professional documents without accounts, subscriptions, or software installation.

The collection includes:

Users can add company and client details, VAT, discounts, shipping charges, payment information, line items, logos, letterheads, signatures, and stamps. Documents can then be previewed, printed, or downloaded as PDFs.

Form data is saved in browser storage, reducing the risk of losing work after an accidental refresh. Uploaded business files remain on the user’s computer and processing happens within the browser.

The tools support English, Indonesian, Portuguese (Brazil), and Arabic with RTL layouts.

I built them to solve a common problem: creating a quick professional invoice should not require registration or a monthly subscription.

Try the free business document tools:

https://tools.defaultcoders.com/en/