Cut start/end segments from any video with fast stream-copy trimming in your browser (keyframe-aligned, no re-encode). Remove a 45-second cold open from a 10-minute upload — local FFmpeg work, unlimited saves.
Runs on FFmpeg
Content reviewed October 2026 · About Toolzum
Speed up or slow down video from 0.1x to 10x (presets 0.25x–4x) with pitch-corrected audio via chained atempo filters. Make a 20-minute lecture watchable at 2x — local FFmpeg work, unlimited saves.
Convert WebM videos to Apple-friendly MOV for Final Cut and QuickTime workflows. Bring web clips into Mac editing — local FFmpeg work, unlimited saves.
Burn text watermarks into a video with 5 position presets (bottom-right default, fixed 24px white on semi-transparent black box). Brand one clip at a time — local FFmpeg work, unlimited saves.
Remove the known password from your own single PDF — owner restrictions and open passwords. Reclaim an archived file you own — local pdf.js and jsPDF work, unlimited saves.
Shrink MP3 files by lowering bitrate with quality presets — fit podcasts into feed limits. Cut a 50 MB episode to 15 MB cleanly — local FFmpeg work, unlimited saves.
Upload, set start to 0:45 and end to the video's end: a 10-minute video becomes 9:15 with streams copied untouched (-c:v copy -c:a copy, faststart). Trims snap to keyframes — if a cut lands off, nudge the start to a keyframe.
No — streams copy without re-encoding, so kept frames are bit-identical and export finishes in seconds. The tradeoff is keyframe granularity, not quality: cuts align to the nearest keyframe.
Under a minute for most clips on a laptop — FFmpeg seeks to the cut point instead of reprocessing everything. Hour-long 4K files take a few minutes; keep the tab open.
No — trimming runs locally in your browser with FFmpeg WASM. Only the final save touches the network — downloads are unlimited.
Crop Video
Crop the visual area of your MP4 or WebM video directly in the browser with 9:16, 1:1, 16:9 presets or custom dimensions with X/Y offsets. Free to start with no signup.
Video Speed Changer
Speed up or slow down video from 0.1x to 10x (presets 0.25x–4x) with pitch-corrected audio via chained atempo filters. Make a 20-minute lecture watchable at 2x — local FFmpeg work, unlimited saves.
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.