Convert a batch of images to one output — JPG, PNG, or WebP — at quality 10–100% (default 80%), capped at 4096px longest side, then download everything as a ZIP. Files that fail conversion fall back to their originals inside the same archive — local library work.
Runs on JSZip
Content reviewed October 2026 · About Toolzum
Shrink JPG, PNG, and WebP photos with an Image Quality slider (10–100%, default 80%) plus a Resolution Scale slider, shown in Before/After panels with exact KB and -% savings. Single-image uploads up to 50MB — local library 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.
Convert image batches between JPG, PNG, WebP, and AVIF outputs (JPEG/PNG/WebP/AVIF/HEIC/HEIF/GIF/BMP/ICO/SVG inputs; HEIC via heic2any, SVG rasterized at intrinsic size or 1024px fallback) with a quality slider (10–100, default 80). Pair pages (?from/?to) preset the output. Flat ZIP renamed per file — local, 5-file guest batches, 25 signed-in, 500 Pro.
Bind hundreds of JPG, PNG, or WebP images into one multi-page PDF with page size, orientation, and fit control. Agents compile 80 property photos into a brochure — local jsPDF work, 2 free batches 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.
This tool converts mixed input folders to ONE chosen output format per batch — fastest for uniform jobs. Bulk Image Converter offers 100+ dedicated format-pair pages with per-pair tuning. Redesigning 150 mixed images to WebP: use this; converting PNG→AVIF specifically: use that pair page.
WebP quality 80 for photos (modern browsers, ~30% smaller than JPEG), PNG for graphics with text. Only JPG, PNG, and WebP outputs exist — convert the full set in one batch, then spot-check a few downloads.
No — the ZIP is flat with no directory layout: each file keeps its basename with the new extension (image_0, image_1 fallback when a name has no stem). Rebuild your upload paths after downloading.
No — conversion runs locally in your browser; images never leave your device. Only the final ZIP counts as one Pro download (signed-in free: 2 a day).
Image Format Converter
Convert one browser-decodable image to PNG, JPG, or WebP — the only outputs canvas can encode. HEIC/SVG/JXL/TIFF and other exotic targets fail honestly instead of pretending. Nothing is uploaded; every conversion runs in your browser.
Bulk Image Format Converter
Convert image batches between JPG, PNG, WebP, and AVIF outputs (JPEG/PNG/WebP/AVIF/HEIC/HEIF/GIF/BMP/ICO/SVG inputs; HEIC via heic2any, SVG rasterized at intrinsic size or 1024px fallback) with a quality slider (10–100, default 80). Pair pages (?from/?to) preset the output. Flat ZIP renamed per file — local, 5-file guest batches, 25 signed-in, 500 Pro.