Resize one animated GIF to exact dimensions via FFmpeg Lanczos (default), Bilinear, or Nearest — width presets 100/150/200/320/480/640px or custom, height auto-follows with aspect lock ON (unlock to stretch). W/H prefill from the source; saves as <name>-resized.gif with animation intact. Photos never leave your device — processing runs locally in your browser with Canvas and WebAssembly.
Runs on FFmpeg
Content reviewed October 2026 · About Toolzum
Scale one image to exact pixel dimensions — width/height fields prefill from the source — with optional aspect-ratio lock, PNG/JPEG/WebP output picker, and quality control for JPEG/WebP. Files over 50MB are rejected; resizing runs on plain canvas drawImage locally.
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.
Convert one APNG to GIF in your browser with FFmpeg WASM — frame rate picker 10/15/24/30fps (default 10), output width 320/480/640/800px (default 320, height auto), palettegen/paletteuse optimize, loop-forever output. Photos never leave your device.
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.
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.
No. The resizer preserves all frames and their timing. Your animation plays at the same speed — only the frame dimensions change.
Yes. Reducing dimensions shrinks the file size proportionally. A 500x500 GIF resized to 250x250 loses about 75% of its file size while keeping the animation intact.
Yes. Transparent pixels in your original GIF remain transparent after resizing. The alpha channel is preserved across all frames.
GIF Editor
Edit animated GIFs in your browser with FFmpeg WASM — resize (Lanczos, aspect lock), speed (setpts), reverse, palette optimize (max_colors with bayer dither), and PNG frame extraction to <name>_frames.zip. No crop, text, or trim tools. Header shows WxH, frame count, KB, and seconds.
GIF Compressor
Compress one animated GIF with FFmpeg: colors slider 2–256 (default 128), Floyd or no dithering, loss tolerance 0–100 (above 50 flips lossless to lossy), and optional duplicate-frame removal (mpdecimate, off by default). Output fps locks to 10; result shows KB and -% and saves as <name>-compressed.gif.