LumenDownload

Freeware for macOS

Turn messy files into meaningful names.

Lumen reads supported documents, names photos when you switch Photo naming on, and proposes clean, consistent filenames. Review every change before anything is renamed. Use on-device AI on an Apple-silicon Mac with 24 GB+ memory, or bring your own cloud AI key.

Download Lumen 1.1See how it works

20 MB macOS 26.4 or later Universal app

  • Free to use
  • Apple-notarised
  • Sandboxed
  • No Lumen account

A calmer file workflow

From mystery scan to useful filename.

Lumen keeps the process simple, inspectable and reversible from the first drop to the final rename.

01

Drop in files or folders

Queue one file, several folders or a whole mixed collection. Quick Look anything before processing.

02

Review meaningful names

Lumen extracts document details and photo metadata to propose consistent filenames. Cloud photo descriptions are optional.

03

Rename with a safety net

Execute only the names you approved. Every successful rename is logged so eligible files can be restored later.

Beforescan_0042.pdf
AfterAlex Morgan - AU - Tax Notice - 2026-03-14.pdf

More than an AI rename button

Built for the decisions around the name.

Handle everyday documents, photo collections and rule-based clean-ups without surrendering control of your files.

Local by default

Use the on-device model for document analysis on an Apple-silicon Mac with 24 GB+ memory. No Lumen account or API key required.

Your choice of provider

For difficult files or visual photo descriptions, optionally use your own Claude, OpenAI, Gemini or xAI API key after a clear consent prompt.

Nothing changes unseen

Compare every original and proposed filename, inspect the notes, then decide exactly what gets renamed.

Powerful batch tools

Find and replace with regular expressions, add prefixes or counters, change case and catch conflicts live.

Names that stay consistent

Map name variations once and Lumen remembers the canonical form for later documents.

Undo built in

Review rename history and restore eligible files when they remain accessible and their previous names are available.

Supported formats

Ready for the files that fill a Mac.

DocumentsPDF · DOCX · XLSX · PPTX · TXT
PhotosJPEG · PNG · HEIC · TIFF · GIF · BMP · WebP
Apple iWorkEmbedded preview · Pages · Numbers · Keynote

Models in Lumen 1.1

One local model. Four optional cloud models.

Choose the privacy, hardware and capability balance that fits each run. Lumen never turns a cloud provider on for you.

On-device · MLX

Phi-4 14B

mlx-community/phi-4-4bit

Lumen's sole local model analyses documents on your Mac. It needs no API key, and local inference has no per-use fee.

Best suited to English-heavy documents; extraction from other languages may be less accurate.

Hardware
Apple silicon · 24 GB+ unified memory
Setup
You start a one-time model download of approximately 8.26 GB before local AI can be used.
Photos
Uses available capture date and optional location metadata; it does not generate a visual description. Resolving coordinates into a place name can contact Apple Maps after separate consent.

Optional cloud AI

  • Claude · Cloud

    Claude Sonnet 5

    claude-sonnet-5
    Documents
    Native PDF/image fallback for weak text results, plus oversized-PDF upload.
    Photos
    Visual descriptions for eligible photos.
  • OpenAI · Cloud

    GPT-5.6 Luna

    gpt-5.6-luna
    Documents
    Native PDF/image fallback for weak text results, plus oversized-PDF upload.
    Photos
    Visual descriptions for eligible photos.
  • Gemini · Cloud

    Gemini 3.5 Flash

    gemini-3.5-flash
    Documents
    Extracted text only; oversized PDFs go to Unprocessed.
    Photos
    Visual descriptions for eligible photos.
  • xAI · Cloud

    Grok 4.3

    grok-4.3
    Documents
    Extracted text only; oversized PDFs go to Unprocessed.
    Photos
    Visual descriptions for eligible photos.
Cloud AI is always opt-in.

Providers are off by default and use your own API key; their API charges may apply. Lumen asks before the first transmission. A document's filename and locally extracted text are normally sent. Claude and OpenAI may also receive a PDF or image for a weak-result fallback, and oversized PDFs may be uploaded through their Files APIs. Gemini and xAI use extracted text only for document analysis; oversized PDFs go to Unprocessed. All four may receive eligible images when visual photo descriptions are enabled and consented.

Privacy that is easy to understand

Local-first by design. Cloud only by choice.

In the default configuration, document analysis runs on your Mac and no document content is transmitted. Lumen has no developer servers, accounts, analytics, advertising or tracking.

If you choose a cloud provider, Lumen shows what will be sent and asks first. Requests go directly from your Mac to that provider using your own API key; they never pass through the developer.

With cloud photo naming enabled, images containing little or no readable text are sent in full to the selected provider. If you use Resolved photo location, Lumen separately asks before sending embedded GPS coordinates to Apple Maps for a place-name lookup.

Read the full Privacy Policy
  • On-device defaultLocal extraction, OCR and analysis.
  • Explicit cloud consentPer provider, revoked when its key changes.
  • Keychain protectionAPI keys are stored in the macOS Keychain and sent only to the selected provider to authenticate requests.
  • Sandboxed file accessLumen scans only locations you select.
Lumen app icon

Lumen 1.1 · Build 2

Download Lumen for Mac.

Free to download and use. Distributed directly as a signed, notarised and Gatekeeper-checked disk image.

Download the 20 MB DMG

System requirements

  • macOS 26.4 or later
  • Universal app: Apple silicon or Intel
  • Local AI: Apple silicon with 24 GB+ memory
  • Intel Macs use an optional cloud provider for AI analysis
  • Local model: approximately 8.26 GB before first use

Install in three steps

  1. 1 Open Lumen-1.1.dmg.
  2. 2 Drag Lumen into Applications.
  3. 3 Eject the disk image and launch Lumen.
Verify the download checksum
SHA-2566aa7156364b1a6d99965e744b81e68ef6ca347788ee459bd51e23d6498aecb43

Version history

What changed in Lumen.

Lumen is distributed directly as a signed and notarised Developer-ID disk image, not through the Mac App Store. Development work appears here only after it ships.

  1. Current releaseCurrent direct download

    Lumen 1.1

    Safer renames, clearer reviews and smoother folder workflows.

    • Strengthened rename and reversion handling with case-only changes, multi-folder access, better collision checks and changed-file warnings.
    • Improved folder intake and Batch Rename responsiveness, reduced memory use for images and oversized PDFs, and made cancellation more reliable.
    • Added provider-key testing and a post-run summary covering named, skipped and AI-declined files plus approximate cloud token usage.
    • Made “Try with…” re-checks clearer, applied accepted Name Review mappings to the current run, and labelled providers in comparison sheets.
    • Added more consistent Space, Y/N and Return keyboard controls, with expanded in-app Help.
    • Added share-safe diagnostic export, protection against corrupt name-mapping files, stronger cloud-upload clean-up, Third-Party Notices and clearer cloud disclosures.
  2. Initial direct freeware release

    Lumen 1.0

    The first Lumen release: meaningful filenames, with you in control.

    • Proposed structured names for supported PDFs, DOCX, XLSX, PPTX, text files, images and iWork embedded previews, with review before renaming.
    • Used Local AI by default on supported Apple-silicon Macs, with optional bring-your-own Claude, OpenAI, Gemini and xAI providers.
    • Added customisable document and photo schemas, metadata-based photo dates and places, optional cloud photo descriptions, and canonical name mappings.
    • Added a multi-folder Drop Zone with Quick Look, grouped queues and per-file inclusion, plus rule-based Batch Rename with regular expressions, dates, counters, case changes and live conflict checks.
    • Added sandboxed access, first-use cloud and location consent, locally stored rename history and eligible-file reversion.

Good to know

A few straight answers.

Is Lumen really free?

Yes. Lumen is free to download and use, with no Lumen account, subscription or in-app purchase. Local AI has no per-use fee. Optional cloud providers use your own account and may charge for their API usage.

Do my files ever leave my Mac?

Not in the default Local AI configuration. If you enable a cloud provider, Lumen asks for consent before transmitting content. Extracted text is ordinarily sent. Claude and OpenAI may also receive an original PDF or image for quality escalation, and oversized PDFs may be uploaded through their Files APIs. Cloud photo naming sends qualifying images in full. Resolved photo location separately sends embedded GPS coordinates to Apple Maps after another consent prompt.

What can Lumen rename?

PDF, DOCX, XLSX, PPTX and TXT documents; JPEG, PNG, HEIC, TIFF, GIF, BMP and WebP images; plus Pages, Numbers and Keynote files read through their embedded previews. Unsupported files remain visible with a reason.

Can I undo a rename?

Lumen keeps rename history on your Mac. Select a previous run in Revert Renames to restore eligible files that remain accessible when their original names are available.

Why is Lumen not in the Mac App Store?

Lumen is distributed directly as freeware. The download is signed with Developer ID, notarised by Apple, sandboxed and checked by Gatekeeper before release.