Project Overview

PDF Tool is a cross-platform Flutter app that bundles 20+ PDF utilities into one offline, privacy-first experience. Users can merge, split, compress, convert, sign, watermark, protect, and edit PDFs entirely on-device — with no signup, no ads, no analytics, and no watermarks on exports.

Heavy operations run as background tasks with a persistent task log, so users can monitor progress, save output PDFs, share results, and review operation history across sessions.

Tools Included

My Responsibilities

• Feature-first architecture: Clean Architecture layout with dedicated folders per tool under lib/features/*, shared core utilities, and a reference merge-PDF domain/data/presentation stack.
• Background task system: Centralized ToolTaskRunner for CPU-intensive PDF work, integrated with TaskLogCubit for progress, success/failure logging, save/share flows, and exportable task history.
• PDF services layer: On-device merge, split, compress, overlay, compare, watermark, redact, sign, page-numbering, image export, text extraction, OCR, and password protect/unlock using pdf, pdf_combiner, syncfusion_flutter_pdf, and custom services.
• Cross-platform I/O: Platform-aware file picking, saving (PlatformSave), web downloads, and conditional dart:io vs web implementations for file bytes, image folders, and previews.
• State management: flutter_bloc for UI state and hydrated_bloc for persisted theme and task log across app restarts.
• Responsive UI: Home grid of tool cards, consistent ToolScaffold layouts, Material 3 theming with light/dark/system modes, and task output preview.
• Privacy by design: All processing on-device, no backend, no tracking — documented in an in-repo privacy policy and HTML host page.
• Multi-target delivery: iOS, Android, Web PWA, and macOS builds via FVM, Makefile targets, and store-ready project configuration.

Tech Stack

Architecture Highlights

• Task-driven heavy work: Tools enqueue background jobs instead of blocking the UI; single-PDF outputs enable Save/Share from the task log.
• Folder outputs: PDF-to-images and extract-images tools log folder paths and image counts while keeping outputPath null (no misleading Save button).
• Platform splits: IO and web implementations for OCR, downloads, file reads, and previews where native APIs differ.
• Test coverage: Unit tests for PDF services, task preview loading, page selection, and core utilities.

Outcome / Highlights

• Offline-first: Full PDF toolkit without internet after install (web PWA caches after first load).
• Ad-free & private: No signup, no ads, no analytics — files never leave the device.
• 20+ tools in one app: From basic merge/split to OCR, redaction, signing, and password protection.
• Transparent operations: Every action is logged with timestamps, status, and copy-friendly details.
• Cross-platform: Shared Dart codebase across mobile, desktop, and web with platform-specific polish.

Skills Demonstrated

• Building production-grade Flutter apps with feature-first module boundaries
• Integrating multiple PDF libraries and wrapping them in testable service layers
• Designing async task UX with persistent logs, save/share, and output preview
• Handling platform differences across mobile, desktop, and web
• Shipping store-ready apps with documented privacy and release checklists

Work With Me

I specialize in cross-platform Flutter apps, offline document tooling, background task systems, and polished Material 3 UX.