What to Check Before Using Sounds from 99Sounds

Updated

99Sounds is an independent sound design label that distributes free sounds and sound effects, and its own site describes the library as free. That answers the price question but not the permission question. Before you drop a 99Sounds file into a client project, a monetized video, or a game build, check the license terms attached to that specific download rather than assuming one blanket rule covers the whole catalog. The checks below are the ones that actually change whether you can publish.

Start with the license on the individual sound page

The most common mistake is treating "free to download" as "free to use anywhere." Those are separate permissions. A sound can cost nothing and still carry conditions on commercial use, redistribution, or attribution.

Because 99Sounds publishes sounds across many packs and pages, terms can differ from one release to the next. Open the page for the exact sound or pack you downloaded and read its license or usage statement before you commit it to a project. If a page states its terms, that statement governs that download — not the homepage, and not a different pack you used last year.

The four questions that decide whether you can publish

Run every sound through these before it goes into a final export:

  • Commercial use — Does the license allow use in paid work, client deliverables, ads, or monetized platforms? Some free libraries permit personal or non-commercial use only.
  • Attribution — Is credit required? If so, what exact wording and where does it go (video description, liner notes, credits screen)? Missing a required credit can invalidate your permission.
  • Redistribution — Are you allowed to re-share the raw files, bundle them into a product, or upload them to another library? Most free sound licenses prohibit passing the files on as-is, even when they allow use in a finished work.
  • Modification — Can you edit, pitch, layer, or resample the sound? This matters if your workflow involves heavy processing.

If a page doesn't answer one of these, treat it as unresolved and either find the answer or choose a sound whose terms you can confirm.

Why "it's free" and "it's cleared" are different things

A free download removes cost, not risk. The risk sits in how the file reaches your audience. For example, if you're scoring a YouTube video that runs ads, the relevant question isn't whether the sound was free — it's whether the license permits commercial use and whether you've met any credit requirement. A sound that's fine in a personal demo can be a problem in a sponsored video under the same license.

This is also why you shouldn't rely on memory or a forum post about "99Sounds' license." Terms can be updated, and different packs can ship under different conditions. The page you downloaded from is the source of truth.

A practical pre-publish checklist

  1. Save or screenshot the license text from the sound's page at download time, so you have a record if the page changes later.
  2. Note the pack name and download date next to the file.
  3. Mark each sound as commercial-OK, attribution-required, or personal-use-only in your project notes.
  4. If attribution is required, add the credit to your project before export — not after.
  5. If you can't confirm commercial rights and the project is monetized, swap the sound for one with clear terms.

When to look elsewhere

If a specific 99Sounds file has terms you can't verify, or its license rules out the use you need, that's the signal to source the sound from a library whose license explicitly covers your case. The cost of a cleared sound is almost always lower than the cost of a takedown or a licensing dispute on a published project.

The short version: 99Sounds offers free sounds, but "free" describes the price, not the permissions. Check the license on the exact page you downloaded from, confirm commercial use, attribution, redistribution, and modification rules, and keep a record of what you found.