OneKit

One simple toolkit. Your files stay yours.

An offline Python toolkit for conversions, PDFs, images, archives, fonts, file inspection, encryption, developer utilities, OCR and comparisons. Use this CLI or the graphical interface at onekit.org. Both use the same processing core and catalog.

Status: initial development version 0.1.0. Stable downloads exist only after their release workflow completes. The distribution is onekit-tools; the separately owned PyPI project called onekit is unrelated.

Install

Python 3.11+ is required. The universal wheel supports Windows, macOS and Linux on x64/ARM64. Optional native libraries and external engines have additional platform requirements.

After publication:

python -m pip install onekit-tools
python -m pip install "onekit-tools[pdf,images,documents]"
onekit list
onekit doctor

From a source checkout:

python -m pip install -e ".[all,test]"
python -m onekit --help
python -m pytest -q

The base CLI has no runtime dependencies. Install only the extras you need. all includes the standard Python families; cryptographic signing uses the separate signing extra. Install native engines separately. For Node-based developer tools, install Node.js 24+ and run onekit engines install. Processing never silently downloads compiler/converter programs.

Use

onekit run pdf-merge first.pdf second.pdf -o combined.pdf
onekit run pdf-extract-pages document.pdf --options '{"pages":"1,3-5"}' -o selected.pdf
onekit run image-convert image.png --options '{"format":"webp"}' -o image.webp
onekit run diff-notebook before.ipynb after.ipynb --options '{"mode":"code"}' -o changes.json
onekit run security-encrypt private-folder --ask-password -o private.onekit
onekit run security-decrypt private.onekit --ask-password -o restored

Options are JSON objects; pass them as one quoted shell argument. Use --ask-password for secrets. Existing outputs are preserved unless you pass --force.

onekit list --group pdf, onekit list --json and onekit doctor TOOL_ID expose contracts and requirements. Every tool has a directory under tools, containing metadata and a pointer to its shared implementation. See the CLI guide for options and limits.

Toolkit

Content-preserving operations and conversions with compromises are distinguished explicitly. PDF-to-Word reconstructs extracted text, not original layout. OCR is not guaranteed exact. Fonts retain their outline technology. The browser exposes only tools verified in its worker; native-only features remain in development there.

Pipelines and development

onekit pipeline --steps workflow.json INPUTS -o OUTPUT composes an ordered JSON array of { "tool": "...", "options": {} } steps. Each receives prior outputs. Single-input steps map over multiple outputs; merge steps receive the collection. Incompatible types stop processing.

Read architecture, engine setup and licenses, release operations, contribution requirements and security. New features and fixes require regression tests. GitHub Actions checks platform compatibility, browser contracts, native integrations, security, licenses and packaging before publication. Dependabot monitors locks, browser requirements, Node engines, Actions and Docker. Conservative compatible lock-only updates can auto-merge after all checks.

Report bugs and suggestions through GitHub issues or the website request board. Contributors can find work in either place.

License and creator

Created by Mattia Piazzalunga. Copyright © 2026 Mattia Piazzalunga. Licensed under Apache-2.0; see NOTICE, AUTHORS.txt and CONTRIBUTORS.txt. Third-party components retain their licenses. External engines are separate programs with their own redistribution obligations.