【Free Download】Detective’s Office Room Background Illustration (Wide Format) — Copainter Users: Free to Use, Commercial Use Allowed

We’re releasing a free detective’s office room background illustration set (wide / 16:9). These wide-format assets are especially useful for PC-oriented projects.
The set also includes time-of-day variations, making it extremely convenient for production.

Please feel free to use them for webtoons, games, manga, and commercial projects including advertisements.
Commercial use is allowed and free of charge. Tracing and edits/additions are also permitted.

Please save the images posted on this page as-is and use them. The license terms are listed at the end of this post.

File Details

• Format: PNG (non-transparent)
• Aspect ratio: Wide
• Resolution: 1344 × 768 px
• How to download: Save each image below as-is.
  Note: A bulk ZIP download is not provided.

Detective’s Office Room Manga/Anime Background Illustrations (Download Available)

Detective Office Study with a Large Window (Day) | Background Asset
A retro investigation room with bookshelves and scattered documents, drawn in bright daytime light—ideal for mystery scenes.

Detective Office Study with a Sunset Window View | Background Asset
Fireplace glow and dusk light create the mood of a cozy investigation office.

Detective Office Study with City Lights at Night | Background Asset
A quiet, cinematic deduction room where the night view and desk lamp stand out.

Detective Workroom with Maps and Files (Day) | Detective Room Background Asset
A neat detective room with maps and notes, lit by natural light—great for reasoning scenes.

Detective Workroom with Sunset Light | Detective Room Background Asset
Warm dusk light and desk props help create a dramatic investigation scene.

Detective Workroom with Night Lighting | Detective Room Background Asset
A calm interior-lit night scene—perfect for private talks or late-night deductions.

Detective Office Study with Rain Outside the Window | Detective Room Background
Raindrops and dim light create a hardboiled detective atmosphere.

Detective Office Study with Sunset Interior Light | Detective Room Background
A moody office where sunset and fireplace light overlap for a dramatic tone.

Detective Office Study with Midnight City Lights | Detective Room Background
Late-night silence and a glowing fireplace—great for a mystery climax.

Detective Investigation Desk and Case Board | Background Asset
A case board with evidence photos and newspapers connected—captures investigative tension.

Detective Desk and Case Board (Dusk Light) | Background Asset
A red-string case board and dusk light create the feeling of deductions progressing.

Detective Desk and Case Board (Night) | Background Asset
A late-night investigation scene where a desk lamp illuminates the evidence.

Detective Office Desk and Map Investigation Board (Day) | Detective Room Background
Natural light from a large window and a map board create a realistic office.

Detective Office Desk and Map Investigation Board (Sunset) | Detective Room Background
Warm sunset light in a quiet office—ideal for dramatic moments.

Detective Office Desk and Case Board (Dim Night) | Background Asset
A shadowy room and evidence board heighten tension for mystery scenes.

Detective Desk with a Typewriter (Cloudy Day) | Background Asset
A classic detective office mood with calm daylight and a typewriter.

Detective Desk with a Typewriter (Sunset Window View) | Background Asset
A sunset gradient and soft light add story and atmosphere.

Detective Desk with a Typewriter (Night) | Detective Room Background Asset
City lights outside and interior lighting—great for stakeouts or late-night deduction scenes.

Detective Desk with File Shelves and a Coat Rack (Day) | Detective Room Background Asset
A practical detective room setup that works in many scenes.

Detective Desk with File Shelves and a Coat Rack (Sunset) | Detective Room Background Asset
An emotional office scene with sunset light stretching across the floor.

Detective Desk by a Moonlit Window | Detective Room Background Asset
A quiet night office with moonlight—ideal for mystery storytelling.

Detective Office Study with a Large Arched Window (Day) | Detective Room Background Asset
A classic detective office with abundant natural light.

Detective Office Study with an Arched Window at Sunset | Detective Room Background Asset
A dramatic, heavy workroom wrapped in sunset colors.

Detective Office Study with a Twilight Window View | Detective Room Background Asset
A calm office scene lit by soft twilight.

Detective Office Reception Area and Study | Detective Room Background Asset
A richly detailed interior with bookshelves and a case map—classic detective office atmosphere.

Detective Office Reception Area (Evening) | Detective Room Background Asset
Warm evening light in a classic detective office setting.

Detective Office Reception Area with a Night Window View | Detective Room Background Asset
A quiet mystery-ready room where interior lights stand out at night.

Detective Work Desk and Case Board (Day) | Detective Room Background Asset
A realistic investigation room with an eye-catching red-string evidence board.

Detective Work Desk and Case Board (Evening) | Detective Room Background Asset
A lively scene with papers spread out under evening light.

Detective Work Desk and Case Board (Night) | Detective Room Background Asset
A tense investigation scene highlighted by city lights and a desk lamp.

How to Use in copainter

Mass-produce variations with the AI Assistant
Download the images above and import them into copainter as reference images. You can optimize them for your work by changing the time of day (morning/evening/night), replacing the sky, and adding props.

Upscale to 4000 px or more with the Upscaling AI
Using the Upscaling AI, you can increase the resolution to a size suitable for most projects.
https://www.copainter.ai/ja/upscaling

Convert into manga-friendly backgrounds with the Inking AI
Load the image as a reference in the Inking AI to generate simplified lines that work well for manga backgrounds. Try selecting different pen touches to create a more original look.
https://www.copainter.ai/ja/inking

Change the aspect ratio with the AI Assistant
If you like an illustration but the aspect ratio makes it hard to use, you can ask the AI Assistant to adjust the aspect ratio for you.

Terms of Use (License)

• Eligible users: copainter subscribers
• Permitted use: Only for works created using copainter (commercial use allowed / free to use)
• Modifications: Allowed (cropping / redraws / color changes / vectorization, etc.)
• Credit: Not required
• Prohibited: Redistribution or sale of the assets themselves / claiming as your own / commercial use outside copainter
• Disclaimer: The provider assumes no responsibility for any damages or issues arising from the use of these materials.

FAQ

Q. I want higher-resolution materials.
A. Use copainter’s Upscaling AI. You can upscale up to 4× in both width and height, making it suitable for commercial use.

Q. Can I use these outside copainter?
A. If you are a copainter subscriber and use them for works created using copainter, commercial use is allowed and free of charge. Edits using external services are also fine as long as the purpose is to use them in works created with copainter. As long as copainter is used for some part of the production process, it is allowed.

Q. Can I use these in commercial projects?
A. Yes, if the work is produced using copainter, commercial use is allowed. You do not need to create the entire work solely with copainter. Redistribution or resale of the assets themselves is not permitted.

Q. Are there other free pose collections?
A. Yes. Please refer to the following:
https://blog.copainter.ai/tag/assets-en/

If you haven’t used copainter yet, this is a great opportunity—please sign up for copainter using the link below!

You can find copainter Learn, our media hub packed with tips and best practices for using copainter effectively, at the link below.