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How to burn a game ISO to a disc
If you have an unprotected ISO of a disc you legally own, cdBurner can write it to a CD or DVD sector-for-sector. It does not remove copy protection or bypass console security, so protected or encrypted titles are out of scope - this guide explains the line.
An ISO file is a single-file snapshot of an entire disc — its files, its layout and any boot data. To use it you don't copy the file onto a disc; you burn the image, which recreates the original disc sector for sector. That's why a properly burned ISO can boot a PC or install an operating system.
What you'll need
- A Windows 10 or 11 PC with a CD, DVD or Blu-ray writer (internal or external USB).
- A blank disc big enough for the image — a CD for small images, a DVD up to 4.7 GB, a Blu-ray for more.
- Your game disc .iso (one you legally own).
- The free cdBurner burn agent — a one-time, 2-second install.
Quick facts
- Works only with unprotected ISO images
- cdBurner does not defeat copy protection
- Only burn discs you legally own
Step by step
Connect the burn agent
Open onlinecdburner.com and make sure the burn agent is connected (install it once if needed).
Insert a blank disc big enough for the image
Match the disc to the image size — a CD for small images, a DVD for up to 4.7 GB, a Blu-ray for more.
Choose “ISO image”
Select your game disc .iso (one you legally own).
Burn the image
cdBurner writes it sector-for-sector so the disc is bootable/readable exactly as intended. Keep Finalize on.
Tips for a clean burn
- Write the ISO as an image, never as a file copy — only an imaged disc boots or behaves like the original.
- Match the disc to the image: CD up to 700 MB, DVD up to 4.7 GB, dual-layer 8.5 GB, Blu-ray 25 GB+. cdBurner shows the fit before you start.
- Leave Finalize on so the disc is closed and reads everywhere.
Common mistakes to avoid
- Copying the .iso onto the disc as a file instead of writing the image — the disc won't boot.
- Choosing a disc that's too small for the image.
- Burning a bootable disc at maximum speed on cheap media, which can corrupt it.
Why cdBurner is different
Most burning apps are bloated installs full of upsells. cdBurner does the whole job from your browser — free, with no toolbars or trialware.
- 100% free — no trial, no watermark, no nag screens.
- Private — files are written locally and never uploaded to a server.
- No bloatware — one small signed helper, not a heavy install.
- Built on Windows' native IMAPI2 engine, so your discs read everywhere.
Frequently asked questions
Will the burned disc be bootable?
If the ISO is a bootable image, yes — cdBurner writes it sector-for-sector and keeps the boot data intact, so the disc boots exactly like the original.
Can't I just copy the ISO file onto the disc?
No. Copying the .iso as a file gives you a disc with one file on it. You must burn the image so the disc becomes what the ISO represents.
Is cdBurner really free?
Yes — completely free and ad-supported. No trial, no watermark and no paid tier.