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.
Runs on FFmpeg
Content reviewed October 2026 · About Toolzum
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.
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.
Grade videos with 18 filters across Color, Artistic, Blur, and Lighting (grayscale, sepia, pixelate, gaussian blur, vignette, brightness/contrast/saturation) plus a live still-frame preview. Export MP4, WebM, or GIF — local FFmpeg 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.
Upgrade one GIF to APNG via FFmpeg apng codec at locked 10fps and source dimensions (Lanczos) — 24-bit color plus 8-bit alpha, no size/quality settings. Result panel shows GIF vs APNG KB with ±% change; saves as <name>.png. Modernize sticker packs — local FFmpeg work, unlimited saves.
1.5–2x for lectures (comprehension holds), 0.25–0.5x for sports analysis and tutorials. The slider spans 0.1x–10x with presets at 0.25, 0.5, 0.75, 1, 1.25, 1.5, 2, and 4x; output duration is simply original ÷ speed, shown live before export.
Yes — video retimes via setpts=PTS/speed while audio chains atempo filters (single atempo within 0.5–2x, chained 2.0/0.5 stages beyond). Past 2.5x, consider muting and adding captions instead.
No — speed changes run locally in your browser with FFmpeg. Only saves touch the network — downloads are unlimited.
Reverse Video
Play any video backwards — video, audio, or both independently. Create rewind effects for social clips — local FFmpeg work, unlimited saves.
Video Trimmer
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.
Video Filters
Grade videos with 18 filters across Color, Artistic, Blur, and Lighting (grayscale, sepia, pixelate, gaussian blur, vignette, brightness/contrast/saturation) plus a live still-frame preview. Export MP4, WebM, or GIF — local FFmpeg work, unlimited saves.