Technical compliance with the invoice system and tax calculation algorithm
In order to fully meet the strict requirements of the so-called invoice system, this generator has a built-in dedicated tax amount calculation engine.
The 13-digit Eligible Billing Business Registration Number starting with T, entered by the business, will be automatically formatted into the specified format and placed in the designated position on the voucher.
Additionally, the system accurately tracks each item's tax classification even in multi-tax transactions where a reduced tax rate of 8 percent and a standard tax rate of 10 percent are mixed.
When calculating the amount of consumption tax, we implement the strict calculation rules set by the National Tax Agency at the program level, such as rounding only once for the total amount divided by tax rate.
This completely eliminates rounding errors that occur when consumption tax is calculated and added up for each individual product, ensuring accurate tax amount display that can withstand tax audits.
This calculation logic is immediately executed within the browser's JavaScript engine, so the correct total amount and consumption tax amount are recalculated the moment the user changes the unit price or quantity.
Client-side PDF binary generation architecture
The biggest technical feature of this generator is its client-side rendering technology, which creates PDF files directly within the user's device without relying on an external PDF generation server.
The HTML and CSS document layout constructed on the screen is first converted into pixel data as a high-resolution Canvas element by the html2canvas library.
Visual details such as font rendering and border thickness are accurately captured through the browser's drawing engine. The extracted image data is then encoded into a standard PDF binary format using a low-layer PDF manipulation library such as pdf-lib.
All of this series of conversion processes is completed within the local memory space, so documents are output instantly without being affected by external factors such as communication delays or server load.
In addition, the generated PDF is directly saved to local storage via the browser's download API, creating a structure that completely eliminates the risk of data leakage via the network.
Requirements of the Electronic Bookkeeping Act and guidelines for local data management
In order to comply with the Electronic Bookkeeping Act, which stipulates the preservation of national tax-related books and documents using electromagnetic records, this system includes local operational guidelines to ensure the visibility and authenticity of the generated evidence data.
To prevent tampering with the PDF files output by this tool, we recommend that the timestamp and version information at the time of publication be retained as metadata.
In addition, it is equipped with a naming convention engine that automatically adds the business partner name, issue date, and consecutive transaction numbers to the file names generated to meet search requirements.
Even when saved to a local file system or cloud storage, it is possible to immediately extract the desired document using the standard search function of the OS.
Since it is a locally-contained system with no centralized management on the server side, the business operator is responsible for backups themselves, but it has the great advantage of being freed from the risk of data loss or inaccessibility due to third-party cloud failure and ensuring business continuity.
. Server non-transmission security structure to isolate sensitive information
The information recorded in invoices and quotations in transactions between companies is a highly confidential group of data, including the customer's name, transaction details, unit price, and the company's bank account information.
With conventional cloud-based billing services, this confidential data is once sent to an external server and stored in a database, so there is always the risk of cyber attacks and information leaks.
To eliminate this fundamental vulnerability, this generator uses a Zero Trust design that completely confines all input data and processing processes within the browser's sandbox environment.
All information entered by the user from the keyboard is never transmitted across network boundaries and is completely erased from volatile memory the moment the browser tab is closed.
Due to this thorough local processing architecture, even if the communication path is intercepted, no data will be leaked, so it provides a solid security foundation that freelancers and small businesses can use with confidence even in strict projects with non-disclosure agreements.
. Dynamic binding of A4 layout in WYSIWYG environment
In order to achieve an intuitive evidence creation experience, this system implements advanced dynamic data binding technology based on the WYSIWYG paradigm.
The input form placed on the left side of the screen and the A4 size preview area expanded on the right side are closely synchronized through bidirectional data binding, and when items are added or amounts are modified, the results are reflected on the preview without a delay of several tens of milliseconds.
This preview screen is not just an image, but an accurate simulation of the A4 size, which is the physical dimension of the final PDF output, according to the pixel density of the browser.
The blank margins during printing, the placement of headers and footers, and the automatic page break processing algorithm when the number of detail lines increases operate in real time on the preview, so there is no discrepancy between the final output and the screen display.
This pixel-perfect drawing control allows users to fully visually check and make adjustments for layout distortions and missing characters before outputting, minimizing work time loss due to re-creation.
Establishing a safe voucher issuance cycle in ordering practices
For freelancers and small businesses, issuing invoices at the end of the month is a serious challenge that takes up valuable time from their main business.
This generator proposes a new work flow that balances safety and speed to eliminate this practical pain point. By caching standard information such as your company's registration number and remittance account in advance using a configuration file or browser's local storage, the monthly issuance process can be reduced to a minimum of just entering the client's name and the current month's operating details.
The mobility that allows you to instantly set up a secure work environment by simply opening your browser without the need to create a cloud service account or go through a complicated login authentication process dramatically improves the speed of your business.
The created PDF file, which is compliant with the invoice system, can be quickly delivered to the client by attaching it to an email or using a secure file transfer service, completing a safe, secure and legally effective billing cycle.