Practical answers about PowerPoint file size, quality, fonts and privacy. Each guide pairs with the free tools that do the work in your browser.
Your .pptx should not be 80 MB. Learn the seven things that secretly bloat PowerPoint files — oversized images, embedded videos, duplicate media, embedded fonts and more — and what to do about each.
Problem explanation · 2026-08-25 · 6 min read
Gmail caps attachments at 25 MB and Outlook at 20 MB. Here is how to shrink any presentation under those limits directly in your browser — including using an exact target-size mode.
Target size · 2026-08-25 · 4 min read
What actually changes between ByteSlim’s four PPTX compression modes — what each one touches, what it never touches, and which one fits bids, emails, or strict attachment limits.
Quality concerns · 2026-08-25 · 5 min read
Embedding fonts makes decks portable but heavy. Learn when embedded fonts matter, how much they cost in file size, and the risk you accept when you remove them.
Fonts · 2026-08-25 · 4 min read
Confidential decks should never touch a stranger’s server. See how browser-based compression works, why no upload is architecturally possible, and how to verify it yourself in DevTools.
Privacy · 2026-08-25 · 5 min read
No PowerPoint license, no Keynote export dance, no App Store downloads. Compress .pptx files on macOS, Windows or Chromebook using only your browser.
Platform · 2026-08-25 · 3 min read