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.
Content reviewed October 2026 · About Toolzum
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.
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.
Downscale a batch of images to one max width (default 1920px) with an optional bottom-right watermark, then download everything as a ZIP. Same max-width and watermark apply to every image — local Canvas work, 3 free images a day.
Create ZIP archives from your files right in your browser. Bundle loose files into one archive.zip with DEFLATE compression — local JSZip work, unlimited saves.
Text only in this tool: episode numbers, URLs, and brand names burn via the drawtext filter at fixed 24px white on a semi-transparent black box. For logo overlays, use the Video Filters pipeline or a desktop editor instead.
Bottom-right corner (the default): visible without blocking faces or captions. Center marks deter theft best but annoy viewers — reserve for paid content.
Yes — the drawtext filter re-encodes video while audio copies untouched, so expect export times like normal conversion. Keep masters archived; distribute watermarked copies. If export fails, FFmpeg WASM may lack FreeType font support in your browser.
No — watermarking runs locally in your browser with FFmpeg. Saves never touch a meter — downloads on local tools are unlimited.
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.
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.