Hit exact file-size targets (10/25/50/100 MB, default 50) across video batches for email and messaging caps. Teams fit 15 clips under Gmail's 25 MB wall — local FFmpeg WASM, 2 free batches a day.
Runs on FFmpeg
Content reviewed October 2026 · About Toolzum
Compress multiple videos with one shared CRF setting (18 high quality, 23 default, 28 smaller, 35 maximum) encoded libx264 medium preset with 128k AAC audio. Studios batch 20 daily uploads at CRF 28 — local FFmpeg WASM, 2 free batches a day.
Burn one shared SRT subtitle file permanently into a whole batch of videos with font-size and bottom/top/middle position control. Course creators hard-sub 20 lessons for platforms that ignore caption files — FFmpeg WASM, 2 free batches a day.
Reduces MP4, MOV, and WebM video file sizes with a configurable CRF 20–40 slider (default 28, libx264 fast preset), plus a GIF mode with color-palette control. Videos never leave your device — compression runs locally in your browser with FFmpeg WASM.
Resize hundreds of photos to one exact W×H canvas (default 800×800, inputs 1–10000px) with Contain, Cover, or Stretch fit — no percentage or preset modes. Transparency flattens onto white; output is always PNG. Photographers deliver 400 wedding shots at uniform size — local Canvas work, 2 free batches a day.
Shrink stacks of PDFs 40–90% with Maximum, Balanced, or High-Quality tiers that recompress images and strip metadata. Firms email 25 filings instead of courier — local pdf-lib work, 2 free batches a day.
Compressor holds quality constant (CRF) and lets size fall where it may; Size Reducer holds your MB target constant and adjusts quality and resolution to hit it. Emailing under 25 MB demands the Reducer; archiving demands the Compressor.
10 MB is safe everywhere, 20 MB clears Outlook, 25 MB clears Gmail. A 15-clip batch at 25 MB each ships as separate emails — messaging apps like WhatsApp need 16–64 MB depending on platform.
The tool derives video bitrate from your target (target MB × 8192 ÷ seconds, clamped 100–10000k, plus 64k AAC audio): a 50 MB target on a 60-second clip encodes near 6800k and stays clean, while a 500→10 MB squeeze visibly softens. Preview one file first — if faces blur, split the batch across two emails instead of crushing further.
No — reduction runs locally in your browser with FFmpeg WASM; footage never leaves your device. Only final saves count against Pro downloads.
Bulk Video Compressor
Compress multiple videos with one shared CRF setting (18 high quality, 23 default, 28 smaller, 35 maximum) encoded libx264 medium preset with 128k AAC audio. Studios batch 20 daily uploads at CRF 28 — local FFmpeg WASM, 2 free batches a day.
Video Compressor
Reduces MP4, MOV, and WebM video file sizes with a configurable CRF 20–40 slider (default 28, libx264 fast preset), plus a GIF mode with color-palette control. Videos never leave your device — compression runs locally in your browser with FFmpeg WASM.
Bulk MP4 Compressor
Compress multiple MP4 videos at once for email, web, or messaging. YouTube studios batch-optimize daily uploads with consistent CRF settings. Everything runs locally in your browser — nothing is uploaded.