Compress video for Reddit
Reddit accepts large videos, but smaller files upload faster and play instantly for everyone in the thread. Slimcast shrinks your clip to an exact size target right in the browser, so there's no long upload and no waiting on a server. Your video never leaves your device, drag it onto the page to start.
Frequently asked
Reddit compression, answered
Is there a file size limit for Reddit videos?
Reddit allows large videos, roughly up to 1 GB and 15 minutes for native uploads. There's no tiny mandatory cap, but a smaller file uploads faster and plays back without buffering, which is why compressing first is worth it.
Does my video get uploaded to compress it?
No. Slimcast runs entirely in your browser through ffmpeg.wasm. Your video never leaves your device, there's no server, no account, and nothing to upload before you post to Reddit.
What size should I target for Reddit?
Pick a target that balances quality and speed. 50 MB is a good default for fast uploads, 25 MB keeps things very light, and 100 to 250 MB preserves more detail for longer or higher-resolution clips. You can also type any custom MB value.
Will the compressed file play correctly on Reddit?
Yes. Slimcast outputs a web-optimized MP4 (H.264 video, AAC audio, with +faststart) that Reddit's player handles cleanly, so the clip starts playing instantly in the thread.