Resize multiple JPG, PNG, WebP, and AVIF images in one batch and download a ZIP.
Drag & drop files here, or
How to Use
1Upload multiple images
2Set dimensions and output format
3Download ZIP
About this tool
Updated
What is Bulk Image Resize?
Bulk Image Resize on Synthixx Tools is a free browser-based utility: upload your file, configure options, run the job, and download the result with no account and no watermark. Resize many images in one job.
Bulk Image Resize runs entirely in your browser session against our secure API. There is no desktop install, no watermark on outputs, and no requirement to create an account for standard jobs. Keep reading for when to use this tool, practical tips, and honest limits.
When should you use Bulk Image Resize?
Use Bulk Image Resize when your goal matches the tool name and you want a free online workflow with clear privacy cleanup. Prefer related tools on this site if you need a different step in the same document pipeline.
Pick Bulk Image Resize when the primary keyword intent matches your task. For multi-step pipelines (OCR → compress → protect), run each step with the matching tool rather than expecting a single upload to do everything. Related tools are linked at the bottom of this page.
Tips for better results
For best results with Bulk Image Resize: use clear filenames, stay within size limits listed in the upload UI, and preview pages when available before you run the job. Re-download promptly — outputs are temporary.
Stay within the upload limits shown in the tool UI. If a job fails, re-check file type and corruption (try Repair PDF). For password-protected inputs, unlock first. After success, download immediately and delete local copies you no longer need.
Privacy and file handling
Synthixx Tools processes files for your requested job only. Transfers use HTTPS; completed job files are scheduled for automatic deletion. We do not sell your documents.
Privacy-first processing is a core product rule: uploads are used to fulfill the tool job you start, not for advertising profiles. Do not upload highly sensitive materials to any free online tool unless your threat model allows it — that advice applies industry-wide, including competitors.
For account features (Design cloud sync), sign-in pages are noindexed; tool pages remain the public SEO surface.
Related workflows on Synthixx Tools
After Bulk Image Resize, continue with related PDF or image tools on Synthixx — merge, split, compress, convert, OCR, protect, and AI PDF Studio — all free and linked from this page.
Internal workflows that often follow Bulk Image Resize include compress for email size, protect for sharing, OCR for searchable archives, and AI PDF Studio for summaries or Q&A. Browse the PDF Tools category hub for the full catalog. Image Resizer and Image Compressor cover bitmap workflows when your output is a picture rather than a PDF.
Features
Up to 50 files
ZIP output
Shared format control
FAQ
What do I download?
The tool outputs a ZIP file with one resized image per input file.
Can I mix formats?
Yes. Common image inputs can be normalized and exported into one shared output format.