Browser edition: files stay on your device. Up to 100 MB total and 10 minutes. First use downloads a 32 MB engine. Some formats depend on codec support. Public-link downloading is not ready on this free deployment.
About Spool
Spool offers browser tools for converting, compressing and editing video, audio and images. Processing uses FFmpeg compiled for the browser, Canvas, heic2any and pdf-lib.
Your files stay on your device
Files are processed in this browser tab using Canvas, PDF processing or a browser media engine. Media files are not uploaded. Save results before closing or reloading the tab. Clear removes the results from this page; files you already downloaded remain on your device.
Limits
Up to 100 MB total per batch, 10 files, 10 minutes of audio or video, and video up to 4K. Large images and PDFs can exhaust device memory. Keep your originals. A format being listed does not guarantee that every codec variant can be read or exported.
Public-link downloading is unavailable in this browser edition. This applies to YouTube, TikTok, Instagram, Facebook, X, Pinterest, Twitch, SoundCloud, Bluesky, Reddit and the other platform routes retained on this site. No paid downloader API or remote conversion service is connected.
If you have the original media file and permission to process it, use the video converter, audio converter or image converter.