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PDF conversion preservation method

Inspect the source-preservation contract, fixture coverage and the limits of local text extraction and OCR.

Written and reviewed by the Pocket Orbit Product TeamUpdated October 18, 2026
Download and requirementsSample workspace

Recognize, preserve, review

  • Compare the real source and editable result before continuing.
Method stages with separate original, extraction, recognition and review
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Method, not a quality certificate

This page describes an inspectable conversion method. Hardware performance and recognition quality require independently reviewed results. No zero-case record or successful interface check establishes production readiness.

Preservation contract

Hash the original before and after conversion. Render selected pages as PNGs, extract positioned text or recognize rendered images, record page number/method/review flags, and package relative references with checksummed assets. Import validates paths, file kinds, versions, expanded sizes and checksums before an atomic journal commit.

Fixture matrix

Test digital text, image-only scans, mixed pages, rotation, columns, tables, diagrams, handwriting, equations, Unicode and each supported recognition language. Include password failure, malformed input, forms, annotations, resource limits, cancellation and retry. A failed page or unsupported form must be reported; retaining the original does not mean its transcription was successful.

Record denominators and counterexamples

Record attempted, completed, failed, cancelled and skipped cases. Keep automatic preservation checks separate from independently reviewed extraction. Score omissions, reading order, negation, numbers/dates and recognition substitutions. OCR errors and generation errors belong to separate tasks. Publish the fixture/build/date and review count with any results.

Network and engine boundaries

Browser workers, fonts and recognition data are served locally from the website origin; downloaded once for the session as required. Document bytes and passwords remain browser state. Apple parsing and Vision use device APIs. Review form/signature appearances against the unchanged PDF. Neither engine guarantees perfect layout, faithful mathematics or editable handwriting reconstruction.

Sources and editorial review

Written and reviewed by the Pocket Orbit Product Team · Updated October 18, 2026

Editorial trust

Sources, method, and update policy

Product claims are checked against the current app. Competitor claims use dated official sources. Corrections can be sent to alpaca-labs.dev@proton.me.

Read the full methodologyPress and citation assets

Continue with a checkable task

Keep originals, review the result and check platform requirements before continuing.

PDF material in a workspace

Continue with relevant material

PDF to Markdown with original pagesExplore workflowPDF material in your Pocket Orbit workspaceExplore workflowPDF to Markdown with images: a worked exampleExplore workflowImport PDF material into a workspaceExplore workflow
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Related evidence and next steps

Try one small, checkable workflow

Start with the sample workspace and check the requirements for your Mac.

Open the sample workspace