What does Bulk Image Resize / Compress do?
Dynamic Duniya’s Bulk Image Resize / Compress helps photographers, marketers, and developers shrink folders of raster images without desktop software. Drop or select many JPEG, PNG, WebP, or GIF files (GIF animation is flattened to a single frame), choose a maximum longest edge in pixels, pick an output format, tune lossy quality when applicable, and download one ZIP containing every processed file. All decoding, scaling, and encoding run in your browser tab—files are not uploaded to our infrastructure.
How batching and memory work
Images are handled one after another to keep RAM predictable on laptops and phones. Very large batches or huge sources may take noticeable time; a progress line shows which file is active. There is a generous per-file size cap and a maximum file count so sessions stay stable.
Output formats and quality
- JPEG and WebP expose a quality slider for smaller files at the cost of fine detail; PNG is lossless and ignores quality.
- The longest-edge cap scales down oversized photos while leaving smaller originals unchanged (until re-encoding changes size).
- After the ZIP is built, a summary compares total original size to total re-encoded size and can highlight extra savings from the DEFLATE archive.
ZIP naming, privacy, and GEO
If several inputs share the same base filename, the tool assigns unique names (for example photo-2.jpg) so nothing inside the ZIP overwrites another entry. Because processing is client-side, teams in India, the United States, the United Kingdom, the EU, and elsewhere get the same workflow as long as the browser supports canvas and modern JavaScript—ideal when regulations discourage shipping originals to third-party APIs.
When to choose another tool
Need AI background removal, single-image lossless workflows, or animated GIF preservation? Browse the other Image tools category entries—this utility focuses on fast, repeatable batch downscale and re-encode to a ZIP.