Create and combine
Convert images to PDF, merge documents, and import existing files.
Utilities · PDF Tools Create, merge, and protect PDFs on your phone.
Create, merge, split, compress, and password-protect PDFs on Android.
THE PRODUCTThe problem
The problem
and the approach.
The challenge
A document task often involves several steps: select files, arrange pages, process the document, find the output and share it. Switching between unrelated tools adds friction on a phone. Users also need to understand when compression may not reduce a file and when OCR produces editable text rather than a searchable PDF.
The approach
Bring image conversion, merging, compression, page splitting, password protection and OCR into a common on-device workspace. Generated and imported files share a library with preview and sharing actions. Protection creates an encrypted copy and verifies storage before reporting success; the original remains separate. OCR extracts printed text for correction, copying or sharing, with results dependent on the input.
Who it helps
People organizing documents on an Android phone, such as combining forms, turning photos into a PDF or extracting text from a printed page.
A typical workflow
- Choose a tool and select images or a PDF from the device.
- Configure the document order, output name or processing options for that task.
- Review the result in My Files, preview it and share it using Android’s file actions.
Work with documents
Compression, splitting, password protection, and text extraction support common document tasks.
Find and share
Keep documents in a file library, preview them, and share through Android.
SCREENSHOTS
Features on screen.
Selected application screens, with example data where shown.
ENGINEERINGHow it
How it
is built.
Checking protection before saving
The password-protection service reads the source bytes, rejects an already protected input, and creates an encrypted copy. It checks that the PDF parser reports the generated bytes as encrypted before choosing a new output path. The original document remains separate from the protected copy.
Waiting for the file write
Producing encrypted bytes is only part of the task. The service awaits the file write, then reads the saved file metadata and checks for a non-empty output before returning success. If processing or storage fails after an output path is created, cleanup attempts to remove the partial file.
What the local checks cover
Two storage regression checks passed on October 17, 2026. One holds the asynchronous write open and verifies that metadata and success wait for completion. The other rejects the write and verifies cleanup and failure. These checks cover storage ordering and failure handling in the reviewed implementation; they do not establish the behavior of every store version.
What I worked on.
Document lifecycle
Creation, import, merge, processing, library organization, and sharing use a consistent mobile file workflow.
Password protection
The protection service checks that the output is encrypted before writing the protected document.
Storage integrity
Success is returned after the asynchronous write and file check; rejected writes trigger cleanup of the partial output.
Brought common document tasks into a shared mobile workspace, from importing and processing files to preview and sharing. The password-protection implementation verifies encrypted output and waits for storage to complete before reporting success, with cleanup if the write fails.
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