Will compressing MP4 reduce quality?

Some quality trade-off is expected, but two-pass encoding and smart downscaling keep it watchable.

Should I use H.264 or H.265?

H.264 plays everywhere; H.265 is smaller but not universally supported. For sharing, H.264 is safest.

Bitrate vs resolution-what matters more?

Size is bitratexduration. If your clip is long, lowering resolution and/or frame rate gives the bitrate more room to preserve detail.

Compress MP4 online

Shrink MP4 to a precise size: 10MB, 25MB, 50MB, or a custom target. Fast, private, and watermark-free.

Prefer a preset? Open the all-in-one compressor preset to 25MB.

Make MP4 smaller without wrecking it

MP4 uses a combination of video bitrate and audio bitrate. To hit a target size, we right-size bitrate and (if needed) gently cap resolution or frame rate. Two-pass H.264 helps spend bits where they matter.

Quick presets for common targets

10MB: Great for Discord; best for short clips and screen captures.
25MB: Works for many email attachments.
50MB: Good balance for cloud links and fast sharing.

Tips

Talking heads & UI: Try 24-30 fps; text stays crisp at lower bitrates.
Fast motion: 720p→480p can help more than pushing bitrate too low.
Audio: 96 kbps AAC is usually enough; keep the rest for video.

Bitrate calculator for your target

Enter duration to see a recommended video bitrate. Adjust target size for 10MB/25MB/50MB use cases.