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01Case study

PDFify

Mobile app · Productivity

A Flutter-based Android app for practical PDF workflows — scan, convert, sign, compress and password-protect documents without uploading them anywhere.

Status: Live on Google Play
Get it on Google Play
PDFify promo frame: 100% offline, zero cloud
PDFify promo frame listing drag-and-drop reorder, AES-256 encryption and the PDF hub
PDFify promo frame: turn any photos into crisp PDFs

01 / PDFify

Frames from the launch video

How it’s built

From the project’s source code

  1. 01Capture

    Gallery picker · ML Kit scanner

    → Arrange & edit

  2. 02Arrange & edit

    Immutable page list · crop, rotate

    → Background isolate

  3. 03Background isolate

    Decode → downsample → compress

    → PDF engine

  4. 04PDF engine

    pdf + printing

    → AES-256, Save · share · print

  5. 05AES-256

    Syncfusion, in an isolate

    → Save · share · print

  6. 06Save · share · print

    share_plus · printing

    → PDF library

  7. 07PDF library

    Hive history + device index

From photo to protected PDF without leaving the phone. Heavy work runs in background isolates so the UI stays responsive.
screens routed with GoRouter
8
feature modules
9
PDF password encryption
AES-256
document uploads — everything runs on-device
0
Status: Live on Google Play

PDFify turns photos and scans into clean PDFs and handles the follow-up tasks people actually need: reordering and cropping pages, adding a signature, compressing large files and locking confidential documents with a password.

The problem

Many document apps upload files to a server, stamp watermarks on the output or put basic conversion behind a subscription. For receipts, IDs and contracts, people need a tool that is fast, predictable and private.

My role

Solo developer — product scope, UI, architecture, implementation, monetization and the Google Play release, published under my developer name J-Tech Utilities. I also produced the launch video in React with Remotion.

Technical approach

  • Feature-first Flutter architecture with Riverpod for state and GoRouter for navigation.
  • PDF generation with the pdf and printing packages; AES-256 encryption through Syncfusion's PDF library.
  • Camera scanning with Google ML Kit's document scanner for edge detection and perspective correction.
  • Local history in Hive, plus a scanner that indexes PDFs already on the device so the app works as an everyday PDF hub.

Engineering decisions

Memory-safe conversion

Images are decoded, downsampled to a capped size, compressed and embedded one at a time in a background isolate, so large batches of high-resolution photos don't freeze the UI or exhaust memory on low-end phones.

Page order you can trust

The page list is immutable and only ever replaced through Riverpod state updates — removing a whole class of reordering bugs that are common in this category.

Respectful monetization

Unlimited conversions without watermarks on the free tier and a one-time Pro unlock instead of a subscription. Interstitial ads never appear on a first conversion and are frequency-capped after that.

Status

Published on Google Play for Android and actively maintained; the latest update shipped in September 2026.

Gallery

  • PDFify promo frame: turn any photos into crisp PDFs
    ArtworkPDFify promo frame: turn any photos into crisp PDFs
  • PDFify promo frame listing drag-and-drop reorder, AES-256 encryption and the PDF hub
    ArtworkPDFify promo frame listing drag-and-drop reorder, AES-256 encryption and the PDF hub
  • PDFify promo frame: 100% offline, zero cloud
    ArtworkPDFify promo frame: 100% offline, zero cloud
  • PDFify promo frame: zero watermarks, unlimited conversions, no subscriptions
    ArtworkPDFify promo frame: zero watermarks, unlimited conversions, no subscriptions