Gapellu PDF Editor - Seamless Online PDF Editing & Invoice Generation Tool
Technologies Used
About the Project
Gapellu PDF Editor is a full-fledged browser-based PDF automation platform designed for businesses that frequently generate official documents such as invoices and purchase orders. Unlike traditional editors, Gapellu simplifies the process with dynamic inputs, real-time previews, and pixel-perfect, print-ready exports. Developed by Web Tech Studio, this SaaS tool combines design precision with powerful PDF manipulation features—all in the cloud.
Key Features & Innovations
- Fillable templates for Invoices and Purchase Orders with editable text fields and dynamic tables.
- Live preview feature that updates in real-time as users type, ensuring WYSIWYG fidelity.
- Easy PDF export with fields embedded and locked for professional use.
- Dynamic row addition in tables for itemized billing, with automatic calculations.
- Mobile-responsive and touch-optimized UI for teams working on the go.
The Challenge
Gapellu was built to solve the pain of offline PDF editing and manual document prep. Challenges included creating real-time editable overlays on fixed templates, ensuring accurate export layout, and designing a fast, accessible UI for all device types.
- Precision in Field MappingAccurately aligning input fields with pre-existing template coordinates was essential for professionalism.
- User-First Form ExperienceSimplifying complex document structures (like dynamic rows) into a smooth UX.
- Consistent Output Across BrowsersEnsuring consistency in downloaded PDFs regardless of OS or device type.
- Performance with PDF RenderingRendering high-resolution templates and handling user inputs without lag or stutter.
Our Solution
By leveraging a combination of React hooks, coordinate-mapped fields, and PDF-Lib, we built a system that allows users to edit business documents with confidence and ease. The UI was fine-tuned for performance, simplicity, and cross-platform usability.
- Template-Driven PDF EditingMapped input positions over static PDFs using absolute positioning and form state binding.
- Preview-As-You-Type InterfaceCreated a real-time rendering interface using React-PDF that visually updates with every keystroke.
- Clean UI with Mobile OptimizationImplemented a responsive, minimalist UI for optimal interaction on phones, tablets, and desktops.
- Locked Export with PDF-LibUsed PDF-Lib to generate non-editable, professional-grade PDFs from filled templates.
- Expandable Row LogicAdded dynamic rows in invoice templates with real-time total calculations for each entry.
Why This Project Stands Out?
- 🔹Truly No-Code PDF EditingNo setup, no downloads—just fill and export right in the browser.
- 🔹Scalable & Ready for IntegrationDesigned for future integration with CRMs or inventory systems via APIs.
- 🔹Precision & Usability CombinedMarries a highly visual UI with reliable PDF processing under the hood.
The Results
Businesses in logistics, retail, and services use Gapellu to streamline document generation.
Reduced document prep time by over 60% compared to manual editing or Word-based templates.
Output files are aligned with standard layouts, maintaining branding and professionalism.
Praised for its clean interface, ease of use, and the accuracy of final exports.
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