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How to burn an ISO file to a disc
An ISO is a single-file snapshot of a whole disc. To use it you write the image, not copy the file. cdBurner does exactly that from your browser — the disc comes out bootable and readable.
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 .iso or .img file.
Burn the image
cdBurner writes it sector-for-sector so the disc is bootable/readable exactly as intended. Keep Finalize on.
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Why cdBurner is different
cdBurner reinvents disc burning: a clean web app that drives the optical drive on your own machine. Nothing else works this way.
- 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.