Guides
Reduce video file size online
Pick your goal—platform upload, messaging, or format fix—then compress or convert in the cloud. No FFmpeg install required.
Large video files slow uploads, fill phone storage, and get rejected by apps. BotMart reduces file size by re-encoding to efficient H.264 MP4 with presets tuned for how you actually publish. Uploads and outputs are deleted automatically within 24 hours.
Quick start
- Sign in (free).
- Open compress video and upload your file.
- Choose a preset (vertical social, horizontal social, or YouTube-style).
- Download the smaller MP4 when processing finishes.
Guides by platform
- YouTube long-form — 16:9 uploads, faster Studio uploads, 1080p-class preset.
- YouTube Shorts — Vertical 9:16 clips before Shorts upload.
- TikTok — Smaller vertical MP4s for faster posting.
- Instagram Reels — Reels-friendly vertical compression.
- WhatsApp — When the app says the video is too large.
- Discord — Fit message upload limits for clips and gameplay.
- Email — Shrink attachments for Gmail and Outlook limits.
- 4K & UHD — Heavy camera exports—1080p free, 4K-class on PRO.
Other ways to shrink files
- Compress MOV — iPhone and camera MOV files.
- Compress WebM — Screen recordings and browser exports.
- MOV to MP4 — Convert iPhone or camera MOV before compressing.
- Convert to MP4 — Fix container compatibility (WebM, MKV, etc.).
- Compress PDF — Separate tool for lighter PDF attachments.
Tips for smaller files without ruining quality
- Start from the best source you have—avoid re-encoding twice.
- Match the preset to destination (vertical for Shorts/Reels/TikTok, horizontal for YouTube long-form).
- For heavy 4K exports or many jobs per day, PRO raises limits and unlocks stronger presets.
FAQ
How much smaller will my file get?
It depends on the source. Screen recordings and 4K phone exports often shrink dramatically; already-compressed clips may change less. Try the free tier on a short clip first.
Is this lossless?
No—smaller size means some detail is discarded. Presets balance size and clarity for typical social and YouTube content.
Need step-by-step basics?
See how it works for the full upload → preset → download flow, or the FAQ.