Everything you need to know about The Printer App
The Printer App is a lightweight Windows desktop application for arranging and printing photos with customizable layouts. Import your photos, choose a paper size, arrange them in a grid, make edits, and print — all in one simple interface.
Currently, The Printer App is available for Windows only. We may consider Mac and Linux versions in the future based on demand. Join the waitlist to stay updated.
No. The Printer App works entirely offline for all photo editing and printing. The only exception is one-time license activation, which requires a brief internet connection to validate your license key. After activation, no internet is needed.
Each license key works on up to 2 computers at the same time. Perfect if you have a desktop and a laptop, or a home and work machine.
Yes. Open the app on your old computer and go to Help → Deactivate License. This frees up the activation slot. Then install the app on your new machine and activate with the same license key.
If you no longer have access to the old machine, contact support@theprinterapp.com and we'll reset it for you.
The free trial lasts 7 days with full functionality — nothing is locked or limited. After the trial, you'll need to purchase a license key to continue using the app. Your layouts and settings are preserved.
The Printer App supports a wide range of image formats:
Standard formats load natively for maximum speed. RAW formats are supported by extracting the camera's own full-resolution preview instantly — no conversion tools needed.
Every camera RAW file embeds a full-resolution JPEG preview rendered by your camera's own image processor (Nikon EXPEED, Canon DIGIC, Sony BIONZ, etc.). The Printer App extracts this preview instantly, giving you:
For rare RAW files without an embedded preview, the app falls back to a built-in processing pipeline for full RAW decoding.
All paper sizes are dimensionally accurate on screen at 96 DPI, giving you a true what-you-see-is-what-you-get preview.
You can arrange 1 to 12 images per page. The app automatically calculates the optimal grid layout based on the number of images. For example:
Yes. You can switch between portrait and landscape orientation for any paper size. The layout grid adjusts automatically to fit the new orientation.
Yes. When you import more images than fit on a single page, the app automatically creates additional pages. You can navigate between pages, drag images between pages, and each page will be printed separately. The app supports up to 50 pages per project.
Yes — the app supports up to 50 pages per project. At 12 images per page, that's up to 600 images in a single session.
Why the limit? The Printer App keeps your original full-resolution images in memory so it can apply edits and print at maximum quality instantly. A 24-megapixel camera image uses roughly 50–100 MB of RAM in its uncompressed form. With hundreds of high-resolution images loaded at once, memory usage adds up quickly. The 50-page cap ensures the app stays fast and stable on a wide range of hardware — from laptops with 8 GB of RAM to desktops with 32 GB+.
If you need to print more than 50 pages, simply save your current layout, start a new project, and continue. Your saved layouts can be reopened anytime.
There are two ways to import photos:
Both methods support all standard image formats and camera RAW files.
The built-in editor panel lets you adjust each image individually or in batch with 7 filter sliders:
You can also rotate (90° increments) and flip (horizontal or vertical) any image directly on the canvas using the hover controls that appear when you mouse over an image.
All edits are non-destructive — your original files are never modified.
Yes. Use the checkboxes on each image to select multiple images, then open the editor. Any slider adjustment will apply to all checked images simultaneously. You can uncheck specific images to protect them from further changes while continuing to edit the rest.
Yes. Click and drag any image on the canvas to swap it with another image, or drop it on an empty cell to move it there.
You can also drag an image from the canvas and drop it onto any page thumbnail at the bottom. If the destination page has an empty spot, the image fills it. If the destination page is full, the image swaps with the first image on that page.
No, never. The Printer App only reads your image files for display and printing. Your original files are never modified, moved, or deleted. All edits (brightness, contrast, rotation, etc.) are applied in memory only and do not affect the source files.
Click the Print button in the toolbar. The app opens a print preview where you can review your layout before sending it to your printer. From the preview you can select your printer, adjust settings, and print at full resolution.
The app renders everything at 300 DPI — the professional standard for photo printing. When you print or export a PDF, the app uses your original full-resolution image (not the screen preview), applies all your edits at full quality, and scales it to fit each grid cell at 300 DPI.
If your PDF file is smaller than your source photos, that's normal. Your originals contain far more pixels than needed at print size, so the output is sized correctly for the paper — not wastefully oversized. A small file does not mean reduced quality.
Yes. The Printer App uses the standard Windows printing system. Any printer that works with Windows (local USB printers, network printers, wireless printers) will work with The Printer App. This includes inkjet, laser, and photo printers from any manufacturer.
Yes! The Printer App has a dedicated Save PDF button right in the toolbar. Click it (or press Ctrl+Shift+P), choose where to save, and your entire layout is exported as a high-quality 300 DPI PDF file — same resolution as printing to paper. Perfect for sharing layouts, sending to a print shop, or archiving your work.
You choose which pages to print. Each page thumbnail has a checkbox — checked pages are included in the print job, unchecked pages are skipped. All pages are checked by default, so clicking Print sends everything to your printer in one go.
Excluded thumbnails are dimmed with a red tint and an "ADD TO PRINT" banner so it's clear at a glance which pages are excluded.
No. The Printer App does not collect, transmit, or store any personal data. It does not use analytics, tracking, cookies, or telemetry. Your photos stay on your computer. The only network communication is a one-time license activation request — no photo data is ever transmitted.
The Printer App is a fully offline application. It does not phone home, check for updates automatically, or send any usage data. The only network request is a one-time license activation. After that, the app works entirely without an internet connection.
Your photos stay exactly where they are on your computer. The Printer App reads them for display and printing but does not move, rename, or upload them. When you save a layout or the app auto-saves your session, only the file paths to your images are stored locally — not the image data itself. Your original files are never touched.
Yes. The Printer App automatically saves your session every 15 seconds while you work. This includes all your images, their positions, page layouts, and any editing adjustments you've made.
If the app closes unexpectedly — whether from a crash, accidental close, or power outage — your work is protected. The next time you launch the app, you'll see a prompt asking if you want to restore your previous session. Click Restore Session to pick up exactly where you left off.
The auto-saved session is automatically cleared when you explicitly save a layout file or start a new project, so you won't be prompted to restore old work you've already saved.
Yes. You can save your layout as a project file that includes the paper size, orientation, grid settings, image positions, and all editing adjustments. Load the project file later to pick up where you left off.
The project file saves references to your original image file locations, along with your layout settings and editing adjustments. If you move or rename the original image files after saving, the app will not be able to reload them when you open the project. Keep your original photos in the same location for best results.
Make sure you have the following:
If the app still won't start, try running it as administrator or reinstalling.
Make sure your RAW file format is one of the supported types: DNG, CR2, CR3, NEF, ARW, ORF, RW2, or RAF. RAW files should load almost instantly. If a specific RAW file fails, it may be from an unsupported camera model or a corrupted file. Try re-importing or converting the file to DNG using your camera manufacturer's software.
Minor differences between screen and print are normal due to the difference between how monitors display light (RGB, backlit) and how printers deposit ink (CMYK). For the best results:
This usually means the source image resolution is too low for the print size. For sharp prints, use high-resolution source images. As a general guideline, you need about 300 pixels per inch (PPI) of printed size. For example, printing a 4×6 inch photo requires at least a 1200×1800 pixel image.
The Printer App is developed by Acme Factory Inc., a software company focused on building practical, privacy-respecting tools for creative professionals.
The Printer App is built with Python and PySide6, the official Qt framework for Python (LGPL 3.0). This gives you a fully native Windows UI with no browser dependencies. The RAW processing engine uses rawpy for fast and accurate camera file decoding across all supported formats.
Email us at support@theprinterapp.com. We aim to respond within 24–48 hours.