Attribution (CC BY): You can use the sound for free, but you must credit the original creator in your project’s description or credits.
Google provides a curated list of sound effects within the YouTube Studio. These are safe to use in monetized videos and are usually high-quality .wav or .mp3 files. Search for "Crowd" or "Ambience" to find various options. BBC Sound Effects crowd chatter free download
Crowd chatter is the "glue" of sound design. By using the free resources listed above and paying attention to your layering, you can transform a flat recording into an immersive experience for your audience. Attribution (CC BY): You can use the sound
Freesound is a massive collaborative database of audio snippets. You can find everything from "muffled small group talk" to "roaring stadium crowds." Most files are uploaded by users and are available under Creative Commons licenses. YouTube Audio Library Search for "Crowd" or "Ambience" to find various options
The BBC has released a vast archive of their sound effects for personal, educational, or research purposes. Their crowd recordings are world-class, featuring specific locations and era-appropriate chatter. Soniss (GDC Bundles)
Creative Commons 0 (CC0): This is the best find. It means the audio is in the public domain. You can use it, remix it, and profit from it without asking permission or giving credit.