Why ByteSlim exists

Files should stay yours — smaller, but never elsewhere. ByteSlim compresses PowerPoint and audio files entirely in your browser, with no file-receiving server at all.

Files should stay yours

Most online compressors upload your file to a stranger's server. ByteSlim flips the architecture: compression runs entirely inside your browser using Web Workers, so there is no server to trust.

How ByteSlim works

1. Browser — the File API reads your .pptx locally
2. Web Worker / WASM — images re-encoded, duplicates and unused media removed
3. Local memory — the result lives in browser memory as a Blob
4. Download — you save a new compressed copy; the original is untouched

What we collect

• File contents: No · File names: No · File metadata: No
• Uploaded files: None — uploading does not exist here
• No accounts, nothing to profile; anonymous page analytics only